Creep-resistant high-strength high-conductivity aluminum alloy conductor material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of conductor materials, and particularly relates to a creep-resistant high-strength high-conductivity aluminum alloy conductor material and a preparation method and application thereof. In the preparation process of the creep-resistant high-strength high-conductivity aluminum alloy conductor material provided by the invention, Be, Mo, Co and the like are introduced into the aluminum alloy conductor material through the intermediate alloy, and AlB3 is used for boronizing treatment; meanwhile, an expansion extrusion process is introduced between aluminum alloy continuous casting and continuous rolling processes, pre-aging treatment is carried out after solid solution heat treatment, and final aging treatment is carried out after drawing treatment; the components and the preparation process of the aluminum alloy conductor material are improved, the comprehensive performance such as conductivity, creep resistance and strength is remarkably improved, the comprehensive performance requirements of new energy automobiles on aluminum alloy conductors can be met, and the technical problem that in the prior art, the comprehensive performance of the aluminum alloy conductor material is poor is solved.

Description

Technical Field

[0001] This application belongs to the technical field of wire materials, and particularly relates to a creep-resistant high-strength and high-conductivity aluminum alloy wire material, a preparation method thereof, and an application thereof. Background Art

[0002] In recent years, new energy vehicles powered by lithium power batteries have developed rapidly. Different from traditional fuel vehicles, new energy vehicles use wires in the battery management system, motor drive system, and charging system. The wires need to provide stable current transmission, low resistance, high conductivity, and low voltage drop, etc., so as to ensure the efficient and reliable operation of the electrical energy storage and supply of new energy vehicles.

[0003] The cruising range is an important indicator of new energy vehicles. Through the idea of vehicle lightweight design, energy consumption can be reduced and the cruising range of new energy vehicles can be improved. Copper is an important metal wire material, but its density is relatively high, making it difficult to meet the lightweight design idea of new energy vehicles; aluminum alloy is a lightweight metal wire material. Using aluminum alloy wires in new energy vehicles is expected to improve the lightweight level of new energy vehicles; however, new energy vehicles rely on electric energy for driving, and it is necessary to minimize the resistance during the transmission of current, thereby reducing energy loss, enabling the electrical energy stored in the battery to be transmitted to various components such as the motor more efficiently, improving the utilization efficiency of electrical energy, and increasing the cruising range of the vehicle. This puts forward requirements for the conductivity of aluminum alloy wires; at the same time, during long-term driving of new energy vehicles, various complex road conditions and vibrations may be experienced, which requires the wires to have sufficient strength and creep resistance to withstand these external forces and prevent damage to the aluminum alloy wires caused by external forces such as vibration, stretching, and bending. This puts forward requirements for the strength and creep resistance of aluminum alloy wires; ordinary aluminum alloy wire materials are difficult to meet the requirements of multiple aspects such as conductivity, creep resistance, and strength on the basis of lightweight, which makes the comprehensive performance of aluminum alloy wire materials poor and difficult to meet the requirements of new energy vehicles for wires. Summary of the Invention

[0004] In view of this, this application provides a creep-resistant high-strength and high-conductivity aluminum alloy wire material, a preparation method thereof, and an application thereof, which are used to solve the technical problem of poor comprehensive performance of aluminum alloy wire materials in the prior art.

[0005] In the first aspect of this application, a creep-resistant high-strength and high-conductivity aluminum alloy wire material is provided, including: Al: 97.60 - 98.54 wt.%, Mg: 0.60 - 0.70 wt.%, Si: 0.55 - 0.65 wt.%, Ti not higher than 0.05 wt.%, Fe not higher than 0.25 wt.%;

[0006] The creep-resistant high-strength and high-conductivity aluminum alloy wire material further includes a modification component, and the modification component is selected from at least two of Be, Mo, and Co. Among them, Be: 0.05~0.15wt.%, Mo: 0.10~0.25wt.%, Co: 0.15~0.25wt.%.

[0007] Preferably, the creep-resistant high-strength and high-conductivity aluminum alloy wire material further includes: B: 0.01~0.10wt.%.

[0008] The second aspect of the present application provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material, which can prepare the creep-resistant high-strength and high-conductivity aluminum alloy wire material described in the first aspect, and includes the following steps:

[0009] Step S1: Preheat at least two of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, and Al-Be master alloy, Al-Mo master alloy, and Al-Co master alloy to obtain preheated raw materials;

[0010] Step S2: Successively carry out melting, refining, and continuous casting on the preheated raw materials to obtain an aluminum alloy continuous casting bar;

[0011] Step S3: Feed the aluminum alloy continuous casting bar into an expanding extruder for expanding extrusion to obtain an aluminum alloy expanding extrusion bar;

[0012] Step S4: Successively carry out continuous rolling, solution treatment, quenching, pre-aging treatment, drawing treatment, and final aging treatment on the aluminum alloy expanding extrusion bar to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0013] Preferably, in step S1, the preheating process includes: preheating at a temperature of 150°C to 300°C for 20 to 60 minutes.

[0014] Preferably, in step S2, the melting process includes: completely melting, stirring, and skimming at least two of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, and Al-Be master alloy, Al-Mo master alloy, and Al-Co master alloy at a temperature of 700°C to 800°C to obtain aluminum alloy liquid;

[0015] The refining process includes: successively carrying out AlB3 boronization treatment, degassing and refining, and impurity removal on the aluminum alloy liquid to obtain refined aluminum alloy liquid;

[0016] The continuous casting process includes: pouring the refined aluminum alloy liquid into a continuous casting mold to obtain an aluminum alloy continuous casting bar with a diameter of 25 to 28 mm.

[0017] Preferably, in step S3, the process of the expansion extrusion includes: under the drive of an expansion continuous extrusion wheel with a rotation speed of 18 - 20 rpm, feeding an aluminum alloy continuous casting bar into an expansion extruder for expansion extrusion and then passing through a die with a diameter of 16 - 18 mm to obtain an aluminum alloy expansion extrusion bar.

[0018] Preferably, in step S4, the process of the continuous rolling includes: heating the aluminum alloy expansion extrusion bar to 500 - 520 °C and feeding it into a continuous rolling mill for rolling to obtain an aluminum alloy rod with a diameter of 10 - 14 mm.

[0019] Preferably, in step S4, the process of the solution treatment includes: performing solution treatment at a temperature of 500 °C - 550 °C for 1.5 - 2.5 h.

[0020] Preferably, in step S4, the quenching method is water quenching.

[0021] Preferably, in step S4, the process of the pre - aging treatment includes: performing pre - aging treatment at a temperature of 185 °C - 235 °C for 0.1 - 1.0 h to obtain a pre - aged aluminum alloy rod.

[0022] Preferably, in step S4, the process of the drawing treatment includes: under the drive of an extrusion wheel with a rotation speed of 10 - 20 rpm, feeding the pre - aged aluminum alloy rod into a drawing machine and drawing it at a drawing rate of 0.5 - 2 m / min through a die with a cone angle 2α = 10 - 20° and an outlet temperature of 450 - 550 °C to obtain an aluminum alloy wire with a diameter of 3 - 7 mm.

[0023] Preferably, the single - pass processing rate in the process of the drawing treatment is 20 - 30%.

[0024] Preferably, in step S4, the process of the final aging treatment includes: successively insulating at an aging temperature of 100 - 140 °C for 6 - 10 h and at an aging temperature of 130 - 170 °C for 1 - 5 h to obtain a creep - resistant high - strength and high - conductivity aluminum alloy wire material.

[0025] The third aspect of the present application provides the application of the high - strength and high - conductivity aluminum alloy wire material described in the second aspect in new energy vehicles.

[0026] The fourth aspect of the present application provides a wire for new energy vehicles, which includes, from the inside to the outside, the creep - resistant high - strength and high - conductivity aluminum alloy wire described in the first aspect, an insulating layer, and a sheath.

[0027] Compared with the prior art, a creep - resistant high - strength and high - conductivity aluminum alloy wire material of the present application has at least the following technical effects:

[0028] 1. The creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by this application introduces modified components such as Be, Mo, Co, etc., and uses AlB3 for boronization treatment, enabling the aluminum alloy wire material to have excellent electrical conductivity, creep resistance, and strength.

[0029] 2. The creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by this application introduces the extended extrusion process between the aluminum alloy continuous casting and continuous rolling processes, performs pre-aging treatment after solution heat treatment, and performs final aging treatment after drawing treatment, enabling the aluminum alloy wire material to have excellent electrical conductivity, creep resistance, and strength.

[0030] 3. The creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by this application significantly improves the comprehensive properties such as electrical conductivity, creep resistance, and strength through the dual improvement of the components and preparation process of the aluminum alloy wire material, and can meet the comprehensive property requirements of aluminum alloy wires for new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic flow chart of a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] This application provides a creep-resistant high-strength and high-conductivity aluminum alloy wire material, a preparation method, and an application, which are used to solve the technical problem of poor comprehensive performance of aluminum alloy wire materials in the prior art.

[0034] The following will clearly and completely describe the technical solutions of this application with reference to the drawings. Obviously, the described embodiments are some embodiments of this application, rather than all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0035] In view of the fact that existing aluminum alloy wire materials are difficult to meet the requirements of multiple aspects such as electrical conductivity, creep resistance, and strength on the basis of light weight, which results in the defect of poor comprehensive performance of current aluminum alloy wire materials and difficulty in meeting the wire performance requirements of new energy vehicles; the present application provides a creep-resistant high-strength and high-conductivity aluminum alloy wire material. The creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by the present application, calculated by mass percentage, includes: Mg: 0.60 - 0.70 wt.%, Si: 0.55 - 0.65 wt.%, Ti not higher than 0.05 wt.%, Fe not higher than 0.25 wt.%, Al: 97.60 - 98.54 wt.%; wherein, the creep-resistant high-strength and high-conductivity aluminum alloy wire material also includes a modification component, and the modification component is selected from at least two of Be, Mo, and Co, and in the modification component, Be: 0.05 - 0.15 wt.%, Mo: 0.10 - 0.25 wt.%, Co: 0.15 - 0.25 wt.%; of course, the creep-resistant high-strength and high-conductivity aluminum alloy wire material also includes some inevitable impurity elements. In the aluminum alloy wire material provided by the present application, the content of each individual impurity element is controlled to be ≤ 0.005 wt.%, and the total amount of other inevitable impurity elements is ≤ 0.02 wt.%.

[0036] In the aluminum alloy wire material provided by the technical solution of the present application, modification components such as Be, Mo, and Co are introduced. The addition of Be can simultaneously improve the strength and electrical conductivity of the aluminum alloy, and the addition of Mo element can enhance the lattice stability of the alloy. By forming a dispersed Mo compound phase, it effectively inhibits grain growth, thereby refining the grain structure and improving the mechanical strength and creep resistance of the material. The Co element, through its solid solution strengthening effect in the alloy, increases lattice distortion, improves the yield strength, tensile strength, and creep resistance of the material; at the same time, the Co element can form stable complexes with impurity elements in the alloy, reduce the interference of impurities on electron flow, optimize the conduction path of the alloy, and thus improve the electrical conductivity. In addition, the combined action of Be, Mo, and Co elements promotes the precipitation reaction during the aging process of the alloy, accelerates the formation of strengthening phases, and further improves the comprehensive mechanical properties and durability of the alloy; thus, the aluminum alloy wire material provided by the technical solution of the present application improves the strength, creep resistance, and electrical conductivity of the aluminum alloy wire by introducing modification components such as Be, Mo, and Co. On the basis of light weight, it also improves the electrical conductivity, creep resistance, strength, and other aspects of performance, making the comprehensive performance of the aluminum alloy wire material improved and meeting the performance requirements of new energy vehicles for aluminum alloy wires.

[0037] As a preferred technical solution, in the aluminum alloy wire material provided by the technical solution of the present application, B: 0.01~0.10 wt.% is also introduced. B can be introduced through AlB3 boriding treatment, so that the grain structure of the aluminum alloy is refined, and the mechanical properties such as the strength and creep resistance of the aluminum alloy are improved. It can also form compounds with impurities and precipitate, reducing the negative impact of impurity elements on conductivity and improving the conductivity of the aluminum alloy wire material.

[0038] Correspondingly, the present application also provides a preparation method of the above aluminum alloy wire material. The preparation method is to preheat aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, and Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and other metals or alloys first, and then melt them completely into aluminum alloy liquid, and use AlB3 boriding treatment, argon degassing, hexachloroethane refining, and covering agent (NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%) for impurity removal. Subsequently, it is cast into a continuous casting mold for continuous casting to obtain an aluminum alloy continuous casting bar; then the aluminum alloy continuous casting bar is fed into an expanding extruder for expanding extrusion to obtain an aluminum alloy expanding extrusion bar; next, the aluminum alloy expanding extrusion bar is successively subjected to continuous rolling, solution treatment, quenching, pre-aging treatment, drawing treatment, and final aging treatment to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material;

[0039] As a preferred technical solution, existing preparation methods such as continuous casting and rolling are difficult to improve the comprehensive performance of aluminum alloy wire materials. However, the preparation method of the aluminum alloy wire material provided by the technical solution of the present application improves the preparation process. The expanding extrusion process is introduced between the aluminum alloy continuous casting and rolling processes. Through expanding extrusion and subsequent thermomechanical treatment, the comprehensive performance such as the conductivity and strength of the aluminum alloy wire material is improved;

[0040] In addition to the improvement of the expanding extrusion process, in the preparation method of the aluminum alloy wire material provided by the technical solution of the present application, after solution heat treatment, pre-aging treatment is also carried out. The pre-aging heat treatment process can well inhibit the negative effects of natural aging after solution heat treatment, and a large number of stable GP zones will be formed during pre-aging. These stable GP zones will serve as nucleation sites to form β” phase, thereby improving the comprehensive performance such as the conductivity and strength of the aluminum alloy wire material;

[0041] In addition to the above improvements in the process of the preparation method of the aluminum alloy wire material, the present application also performs drawing treatment and final aging treatment after the drawing treatment; the drawing treatment introduces a dense dislocation network in the aluminum alloy matrix wire material. This process not only significantly improves the mechanical strength of the alloy through work hardening, but also these dislocations will become the key paths for the migration of Mg and Si elements in the subsequent artificial aging treatment, effectively catalyzing the formation of GP zones and the transformation to β'' phase, thereby greatly enhancing the growth driving force of the precipitates during the aging process; in addition, the distribution of dislocations can also serve as heterogeneous nucleation centers for the precipitation reaction, enabling the alloy to achieve efficient hardening effect in a short time and realizing the rapid and directional optimization of material properties; this improves the comprehensive properties such as conductivity and strength of the aluminum alloy wire material.

[0042] The creep-resistant high-strength and high-conductivity aluminum alloy wire material provided by the present application will be specifically described below in combination with examples and experimental examples.

[0043] Example 1

[0044] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. The preparation method includes a raw material preheating step, a melting step, an in-furnace refining step, a horizontal continuous casting step, an expanding extrusion step, a continuous rolling step, and a thermomechanical treatment step.

[0045] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy, and AlB3 boronizing agent according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.12 wt.%, Ti: 0.03 wt.%, Fe: 0.20 wt.%, B: 0.05 wt.%, Mo: 0.20 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%). Then put the raw materials into a drying oven and preheat at 200 °C for 30 min, and preheat the mold and industrial pure aluminum at 250 °C for the same time.

[0046] The melting step includes: melting industrial pure aluminum ingots with a purity of not less than 99.85% at 720 °C. After the aluminum ingots are completely melted, raise the temperature to 750 °C, add the preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keep warm for 40 min, stir once every 10 min, stir and skim the slag after heating and melting, stir the melted aluminum alloy liquid evenly, take samples for spectral analysis, and control the composition of the aluminum liquid melt within the required range to obtain the aluminum alloy liquid.

[0047] The in-furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling down to 720 °C, introducing high-purity argon and a refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, adding a covering agent and standing for 35 minutes, and then thoroughly cleaning the surface scum; the refining agent used is hexachloroethane, with a dosage of 0.20% of the melt mass, while the dosage of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0048] The horizontal continuous casting steps include: pouring the refined aluminum alloy liquid into the continuous casting mold to obtain an aluminum alloy continuous casting bar with a diameter of 25 - 28 mm.

[0049] The extended extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting, feeding it into the aluminum alloy extended extrusion machine, where the metal will flow fully to both sides, the rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die opening of the extended continuous extrusion is 16 - 18 mm; after being driven by the friction of the extrusion wheel, it directly enters the die expansion cavity, enters the die sizing zone and is extruded into a product, and finally the rod material enters the water pool near the die opening and is cooled online to room temperature.

[0050] The continuous rolling steps include: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at an incoming rolling temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and cooling the aluminum alloy rod with online cooling water, and using an automatic wire winding device for winding.

[0051] The thermomechanical treatment steps include: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then water quenching, and then performing pre-aging treatment at 185 °C for 0.5 h; subsequently, using a drawing machine for drawing treatment, at room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm, the die exit temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small deformation amount drawing manner, with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain a 7-mm aluminum alloy drawn wire; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at an aging temperature of 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material, which is made into a wire together with the insulating layer and the sheath, and is used in new energy vehicles.

[0052] Example 2

[0053] This embodiment provides a method for preparing a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. For comparison with Example 1, the preparation method differs from Example 1 in that the raw material formulation and process parameters, such as temperature, of the aluminum alloy wire material are adjusted. The method includes a raw material preheating step, a smelting step, a furnace refining step, a horizontal continuous casting step, an extended extrusion step, a continuous rolling step, and a thermomechanical heat treatment step.

[0054] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.60wt.%, Si: 0.55wt.%, Be: 0.08wt.%, Ti: 0.02wt.%, Fe: 0.10wt.%, B: 0.05wt.%, Mo: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0055] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, heating to 740°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming off the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0056] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 710°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 10 minutes, and then adding a covering agent and letting it stand for 30 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0057] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0058] The extended extrusion step includes: feeding the surface-cleaned and dried aluminum alloy rod obtained by horizontal continuous casting into an aluminum alloy extended extrusion machine, where the metal will flow fully to both sides. The rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die orifice of the extended continuous extrusion is 16 - 18 mm; after being friction-driven by the extrusion wheel, it directly enters the die expansion cavity, and after entering the sizing zone of the die, it is extruded into a product. Finally, the rod stock enters the water pool near the die orifice and is cooled online to room temperature.

[0059] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at a rolling-in temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and cooling the aluminum alloy rod with online cooling water, and using an automatic wire take-up device for coiling;

[0060] The thermomechanical treatment step includes: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then water quenching, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm and a die exit temperature of approximately 500 °C, drawing treatment is carried out in a low-speed and small-deformation manner, and the drawing rate is 1 m / min; according to the principle of minimum drawing force, the cone angle 2α of the drawing die is 16°, and the processing rate per pass is 20% to obtain an aluminum alloy drawn wire with a diameter of 7 mm; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at an aging temperature of 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material.

[0061] Example 3

[0062] This example provides a preparation method of a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting process parameters such as the raw material formula and temperature of the aluminum alloy wire material. The preparation method includes a raw material preheating step, a melting step, an in-furnace refining step, a horizontal continuous casting step, an extended extrusion step, a continuous rolling step, and a thermomechanical treatment step.

[0063] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.70wt.%, Si: 0.65wt.%, Be: 0.15wt.%, Ti: 0.04wt.%, Fe: 0.24wt.%, B: 0.05wt.%, Mo: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0064] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 730°C, heating to 760°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingot, Al-Si and Al-Be master alloys, and keeping warm for 50 minutes, stirring once every 10 minutes, stirring and skimming off the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0065] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, stirring thoroughly, then cooling to 730°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 15 minutes, and then adding a covering agent and letting it stand for 40 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.30% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0066] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0067] The expansion extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and feeding it into the aluminum alloy expansion extruder. The metal will flow fully to both sides. The speed of the expansion continuous extrusion wheel is 18-20rpm, and the diameter of the expansion continuous extrusion die is 16-18mm. After being driven by friction of the extrusion wheel, it directly enters the mold expansion cavity, enters the mold sizing belt, and is extruded into a product. Finally, the rod material enters the water pool near the die mouth for online cooling to room temperature.

[0068] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at a rolling-in temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, cooling the aluminum alloy rod with on-line cooling water, and winding it with an automatic wire take-up device;

[0069] The thermomechanical treatment step includes: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then quenching in water, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, performing drawing treatment with a drawing machine, using an extrusion wheel rotation speed of 15 rpm at room temperature of 25 °C, a die exit temperature of approximately 500 °C, and a low-speed and small deformation amount drawing method with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain an aluminum alloy drawn wire with a diameter of 7 mm; next, performing final aging treatment by maintaining the temperature at 120 °C for 8 h and then at 155 °C for 3 h in sequence; after the final aging treatment, cooling at room temperature, and finally performing appropriate cutting and adjustment according to the required length of the wire to obtain a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material.

[0070] Example 4

[0071] This example provides a preparation method of a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting the raw material formula of the aluminum alloy wire material, including raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, extended extrusion step, continuous rolling step, and thermomechanical treatment step.

[0072] The raw material preheating step includes: preparing Al - Si master alloy, Al - Ti master alloy, Al - Fe master alloy, Al - Be master alloy, Al - Mo master alloy, and Al - Co master alloy according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.05 wt.%, Ti: 0.02 wt.%, Fe: 0.15 wt.%, Mo: 0.10 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%). Then, put the raw materials into a drying oven and preheat at 200 °C for 30 min, and preheat the die and industrial pure aluminum at 250 °C for the same time.

[0073] The melting step includes: melting industrial pure aluminum ingots with a purity of not less than 99.85% at 720 °C. After the aluminum ingots are completely melted, the temperature is raised to 750 °C, and preheated pure magnesium ingots, Al-Si and Al-Be master alloys are added, and then held for 40 min, stirred every 10 min. After heating and melting, stir and skim the slag, fully stir the melted aluminum alloy liquid evenly, take samples for spectral analysis, and control the composition of the molten aluminum liquid within the required range to obtain the aluminum alloy liquid.

[0074] The in-furnace refining step includes: transferring the aluminum alloy liquid in the melting furnace to the holding furnace for full stirring, then cooling down to 720 °C, introducing high-purity argon gas and a refining agent to degas and refine the aluminum alloy liquid respectively for 12 min, and then adding a covering agent and standing for 35 min, and finally thoroughly cleaning the surface scum; the refining agent used is hexachloroethane, and the dosage is 0.20% of the melt mass, while the dosage of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0075] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to obtain an aluminum alloy continuous casting bar with a diameter of 25 - 28 mm.

[0076] The extended extrusion step includes: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and feeding it into an aluminum alloy extended extrusion machine. The metal will flow fully to both sides, the rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die orifice of the extended continuous extrusion is 16 - 18 mm; after being driven by the friction of the extrusion wheel, it directly enters the die expansion cavity, and after entering the die sizing zone, it is extruded into a product, and finally the rod stock enters the water pool near the die orifice and is cooled online to room temperature.

[0077] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at an incoming rolling temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and cooling the aluminum alloy rod with online cooling water, and using an automatic wire take-up device for winding.

[0078] The thermomechanical treatment steps include: first, solution treatment at 510 - 530 °C for 1.5 - 2.5 h followed by water quenching, then pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, with an extrusion wheel speed of 15 rpm and a die exit temperature of approximately 500 °C, drawing treatment is carried out in a low-speed and small deformation amount drawing manner, and the drawing rate is 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain 7-mm aluminum alloy drawn wire; next, final aging treatment is carried out by keeping warm at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0079] Example 5

[0080] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting the raw material formula of the aluminum alloy wire material, including raw material preheating steps, melting steps, in-furnace refining steps, horizontal continuous casting steps, expanding extrusion steps, continuous rolling steps, and thermomechanical treatment steps.

[0081] The raw material preheating steps include: according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.15 wt.%, Ti: 0.03 wt.%, Fe: 0.20 wt.%, B: 0.05 wt.%, Mo: 0.20 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%), prepare Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, and Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy, and AlB3 boronizing agent. Then, put the raw materials into a drying oven and preheat at 200 °C for 30 min, and preheat the die and industrial pure aluminum at 250 °C for the same time.

[0082] The melting steps include: melting industrial pure aluminum ingots with a purity of not less than 99.85% at 720 °C. After the aluminum ingots are completely melted, raise the temperature to 750 °C, add the preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keep warm for 40 min, stirring once every 10 min. After heating and melting, stir and skim the slag, fully stir the melted aluminum alloy liquid evenly, take samples for spectral analysis, and control the composition of the aluminum liquid melt within the required range to obtain the aluminum alloy liquid.

[0083] The in-furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720 °C, introducing high-purity argon gas and a refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, adding a covering agent and standing for 35 minutes, and then thoroughly cleaning the surface scum; the refining agent used is hexachloroethane, with a dosage of 0.20% of the melt mass, and the dosage of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0084] The horizontal continuous casting steps include: casting the refined aluminum alloy liquid into a continuous casting mold to obtain an aluminum alloy continuous casting bar with a diameter of 25 - 28 mm.

[0085] The extended extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting, feeding it into an aluminum alloy extended extrusion machine, where the metal will flow fully to both sides, the rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die opening of the extended continuous extrusion is 16 - 18 mm; after being friction-driven by the extrusion wheel, it directly enters the die expansion cavity, enters the die sizing zone and is extruded into a product, and finally the rod stock enters a water pool near the die opening and is cooled online to room temperature.

[0086] The continuous rolling steps include: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at an incoming rolling temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and cooling the aluminum alloy rod with online cooling water, and using an automatic wire take-up device for coiling.

[0087] The thermomechanical treatment steps include: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then water quenching, followed by pre-aging treatment at 185 °C for 0.5 h; then using a drawing machine for drawing treatment, at room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm, the die outlet temperature is about 500 °C, and drawing treatment is carried out in a low-speed small deformation mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain an aluminum alloy drawn wire with a diameter of 7 mm; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at an aging temperature of 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0088] Example 6

[0089] This embodiment provides a method for preparing a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. For comparison with Example 1, the preparation method differs from Example 1 in that the raw material formula of the aluminum alloy wire material is adjusted. The method includes a raw material preheating step, a smelting step, a furnace refining step, a horizontal continuous casting step, an extended extrusion step, a continuous rolling step, and a thermomechanical heat treatment step.

[0090] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.65wt.%, Si: 0.60wt.%, Be: 0.12wt.%, Ti: 0.03wt.%, Fe: 0.20wt.%, B: 0.05wt.%, Mo: 0.20wt.%, Co: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0091] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0092] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0093] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0094] The extended extrusion step includes: feeding the surface-cleaned and dried aluminum alloy rod obtained by horizontal continuous casting into an aluminum alloy extended extrusion machine. The metal will flow fully to both sides. The rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die orifice of the extended continuous extrusion is 16 - 18 mm. After being friction-driven by the extrusion wheel, it directly enters the die expansion cavity, and after entering the sizing zone of the die, it is extruded into a product. Finally, the rod stock enters the water pool near the die orifice and is cooled online to room temperature.

[0095] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill. The rolling-in temperature is 500 - 520 °C, an aluminum alloy rod with a diameter of 10 - 14 mm is produced, and the aluminum alloy rod is cooled by online cooling water, and a wire winding device is used for winding.

[0096] The thermomechanical treatment step includes: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then water quenching, followed by pre-aging treatment at 185 °C for 0.5 h. Subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm and a die outlet temperature of approximately 500 °C, drawing treatment is carried out in a low-speed and small-deformation mode, and the drawing rate is 1 m / min. According to the principle of minimum drawing force, the cone angle 2α of the drawing die is 16°, and the processing rate per pass is 20% to obtain a 7-mm aluminum alloy drawn wire. Next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h. After the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material.

[0097] Example 7

[0098] This example provides a preparation method of a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 is that the temperature of the solution heat treatment is adjusted, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, extended extrusion, continuous rolling, and thermomechanical treatment.

[0099] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.65wt.%, Si: 0.60wt.%, Be: 0.12wt.%, Ti: 0.03wt.%, Fe: 0.20wt.%, B: 0.05wt.%, Mo: 0.20wt.%, Co: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0100] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0101] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0102] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0103] The expansion extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and feeding it into the aluminum alloy expansion extruder. The metal will flow fully to both sides. The speed of the expansion continuous extrusion wheel is 18-20rpm, and the diameter of the expansion continuous extrusion die is 16-18mm. After being driven by friction of the extrusion wheel, it directly enters the mold expansion cavity, enters the mold sizing belt, and is extruded into a product. Finally, the rod material enters the water pool near the die mouth for online cooling to room temperature.

[0104] The continuous rolling step includes: rolling the cooled aluminum alloy expanded extrusion bar on a continuous rolling mill at a rolling-in temperature of 500-520°C to obtain an aluminum alloy rod with a diameter of 10-14 mm, cooling the aluminum alloy rod with on-line cooling water, and winding it up with an automatic wire take-up device.

[0105] The thermomechanical treatment step includes: first, solution treatment at 500°C for 1.5-2.5 h followed by water quenching, then pre-aging treatment at 185°C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25°C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500°C, and the drawing treatment is carried out in a low-speed and small deformation mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain an aluminum alloy drawn wire with a diameter of 7 mm; next, final aging treatment is carried out by holding at an aging temperature of 120°C for 8 h and then at an aging temperature of 155°C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0106] Example 8

[0107] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 is that the temperature of the solution heat treatment is adjusted, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, expanded extrusion, continuous rolling, and thermomechanical treatment.

[0108] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy, and AlB3 boronizing agent according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.12 wt.%, Ti: 0.03 wt.%, Fe: 0.20 wt.%, B: 0.05 wt.%, Mo: 0.20 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%). Then, the raw materials are put into a drying oven and preheated at 200°C for 30 min, and the die and industrial pure aluminum are preheated at 250°C for the same time.

[0109] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0110] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0111] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0112] The expansion extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and feeding it into the aluminum alloy expansion extruder. The metal will flow fully to both sides. The speed of the expansion continuous extrusion wheel is 18-20rpm, and the diameter of the expansion continuous extrusion die is 16-18mm. After being driven by friction of the extrusion wheel, it directly enters the mold expansion cavity, enters the mold sizing belt, and is extruded into a product. Finally, the rod material enters the water pool near the die mouth for online cooling to room temperature.

[0113] The continuous rolling step includes: rolling the cooled aluminum alloy expanded extruded strip on a continuous rolling mill at a rolling temperature of 500-520°C to obtain a 10-14mm aluminum alloy rod, cooling the aluminum alloy rod with online cooling water, and winding it with an automatic winding device.

[0114] The thermomechanical treatment steps include: first, solution treatment at 550 °C for 1.5 - 2.5 h followed by water quenching, then pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die exit temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small deformation mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain 7 mm aluminum alloy drawn wire; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant, high-strength and high-conductivity aluminum alloy wire material.

[0115] Example 9

[0116] This example provides a preparation method of a creep-resistant, high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 is that the temperature of the pre-aging treatment is adjusted, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, expanding extrusion, continuous rolling, and thermomechanical treatment steps.

[0117] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy, and AlB3 boronizing agent according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.12 wt.%, Ti: 0.03 wt.%, Fe: 0.20 wt.%, B: 0.05 wt.%, Mo: 0.20 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%). Then, the raw materials are put into a drying oven and preheated at 200 °C for 30 min, and the die and industrial pure aluminum are preheated at 250 °C for the same time.

[0118] The melting step includes: melting industrial pure aluminum ingots with a purity of not less than 99.85% at 720 °C. After the aluminum ingots are completely melted, the temperature is raised to 750 °C, and preheated pure magnesium ingots, Al-Si and Al-Be master alloys are added, and it is held for 40 min, stirred every 10 min, heated and melted, then stirred and skimmed the slag, and the melted aluminum alloy liquid is fully stirred evenly. A sample is taken for spectral analysis to control the composition of the molten aluminum liquid within the required range to obtain the aluminum alloy liquid.

[0119] The in-furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, stirring thoroughly, then cooling to 720 °C, introducing high-purity argon gas and a refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, adding a covering agent and standing for 35 minutes, and then thoroughly cleaning the surface scum; the refining agent used is hexachloroethane, with a dosage of 0.20% of the melt mass, and the dosage of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0120] The horizontal continuous casting steps include: casting the refined aluminum alloy liquid into a continuous casting mold to obtain an aluminum alloy continuous casting bar with a diameter of 25 - 28 mm.

[0121] The extended extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and then feeding it into an aluminum alloy extended extrusion machine. The metal will flow fully to both sides. The rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die opening of the extended continuous extrusion is 16 - 18 mm; after being driven by the friction of the extrusion wheel, it directly enters the die expansion cavity, enters the die sizing zone and is extruded into a product, and finally the rod stock enters the water pool near the die opening and is cooled online to room temperature.

[0122] The continuous rolling steps include: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at an incoming rolling temperature of 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and cooling the aluminum alloy rod with online cooling water, and using an automatic wire winding device for winding.

[0123] The thermomechanical treatment steps include: first performing solution treatment at 510 - 530 °C for 1.5 - 2.5 h and then water quenching, and then performing pre-aging treatment at 200 °C for 0.5 h; subsequently, using a drawing machine for drawing treatment, at room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm, a die outlet temperature of about 500 °C, and a low-speed and small deformation amount drawing method for drawing treatment, and a drawing rate of 1 m / min; according to the principle of the minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain a 7-mm aluminum alloy drawn wire; next, perform final aging treatment by holding at an aging temperature of 120 °C for 8 h and at an aging temperature of 155 °C for 3 h in sequence; after the final aging treatment, cool at room temperature, and finally perform appropriate cutting and adjustment according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0124] Example 10

[0125] This embodiment provides a method for preparing a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. For comparison with Example 1, this method differs from Example 1 in that the temperature of the pre-aging treatment is adjusted. The method includes a raw material preheating step, a smelting step, a furnace refining step, a horizontal continuous casting step, an extended extrusion step, a continuous rolling step, and a thermomechanical heat treatment step.

[0126] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.65wt.%, Si: 0.60wt.%, Be: 0.12wt.%, Ti: 0.03wt.%, Fe: 0.20wt.%, B: 0.05wt.%, Mo: 0.20wt.%, Co: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0127] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0128] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0129] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0130] The extended extrusion step includes: feeding the surface-cleaned and dried aluminum alloy rod obtained by horizontal continuous casting into an aluminum alloy extended extrusion machine. The metal will flow fully to both sides. The rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die orifice for extended continuous extrusion is 16 - 18 mm. After being friction-driven by the extrusion wheel, it directly enters the die expansion cavity, and after entering the sizing zone of the die, it is extruded into a product. Finally, the rod stock enters the water pool near the die orifice and is cooled online to room temperature.

[0131] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill. The rolling-in temperature is 500 - 520 °C to obtain an aluminum alloy rod with a diameter of 10 - 14 mm, and the aluminum alloy rod is cooled by online cooling water and wound up using an automatic wire-reeling device.

[0132] The thermomechanical treatment step includes: first, solution treatment at 510 - 530 °C for 1.5 - 2.5 h followed by water quenching, then pre-aging treatment at 235 °C for 0.5 h. Subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm and a die outlet temperature of approximately 500 °C, drawing treatment is carried out in a low-speed and small-deformation manner, and the drawing rate is 1 m / min. According to the principle of minimum drawing force, the cone angle 2α of the drawing die is 16°, and the single-pass processing rate is 20% to obtain an aluminum alloy drawn wire with a diameter of 7 mm. Next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at an aging temperature of 155 °C for 3 h in sequence. After the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material.

[0133] Example 11

[0134] This example provides a preparation method of a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting the single-pass processing rate in the drawing treatment, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, extended extrusion, continuous rolling, and thermomechanical treatment.

[0135] Among them, the steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, extended extrusion, and continuous rolling are exactly the same as those in Example 1.

[0136] The thermomechanical treatment steps include: first, solution treatment is carried out at 510 - 530 °C for 1.5 - 2.5 h and then water quenching is performed, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die exit temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small-deformation drawing manner with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, the single-pass processing rate is 25%, and 7-mm aluminum alloy drawn wire is obtained; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain the creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0137] Example 12

[0138] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting the single-pass processing rate in the drawing treatment, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, expanding extrusion, continuous rolling, and thermomechanical treatment steps.

[0139] Among them, the steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, expanding extrusion, and continuous rolling are exactly the same as those in Example 1.

[0140] The thermomechanical treatment steps include: first, solution treatment is carried out at 510 - 530 °C for 1.5 - 2.5 h and then water quenching is performed, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die exit temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small-deformation drawing manner with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, the single-pass processing rate is 30%, and 7-mm aluminum alloy drawn wire is obtained; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain the creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0141] Example 13

[0142] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in adjusting the final aging treatment, including steps of raw material preheating, melting, in-furnace refining, horizontal continuous casting, expanding extrusion, continuous rolling, and thermomechanical treatment steps.

[0143] Among them, the raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, expanding extrusion step, and continuous rolling step are exactly the same as those in Example 1.

[0144] The thermomechanical treatment step includes: first, solution treatment is carried out at 510 - 530 °C for 1.5 - 2.5 h and then water quenched, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small deformation amount drawing mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, the one-pass processing rate is 20%, and 7 mm aluminum alloy drawn wire is obtained; next, final aging treatment is carried out by holding at an aging temperature of 200 °C for 11 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain the creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0145] Example 14

[0146] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 lies in the adjustment of the final aging treatment, including the raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, expanding extrusion step, continuous rolling step, and thermomechanical treatment step.

[0147] Among them, the raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, expanding extrusion step, and continuous rolling step are exactly the same as those in Example 1.

[0148] The thermomechanical treatment step includes: first, solution treatment is carried out at 510 - 530 °C for 1.5 - 2.5 h and then water quenched, followed by pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small deformation amount drawing mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, the one-pass processing rate is 20%, and 7 mm aluminum alloy drawn wire is obtained; next, final aging treatment is carried out by holding at an aging temperature of 240 °C for 11 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain the creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0149] Example 15

[0150] This embodiment provides a method for preparing a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the preparation method differs from Example 1 in that no extended extrusion is performed. The method includes a raw material preheating step, a smelting step, a furnace refining step, a horizontal continuous casting step, a continuous rolling step, and a deformation heat treatment step.

[0151] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.65wt.%, Si: 0.60wt.%, Be: 0.12wt.%, Ti: 0.03wt.%, Fe: 0.20wt.%, B: 0.05wt.%, Mo: 0.20wt.%, Co: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0152] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0153] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0154] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0155] The continuous rolling step includes: rolling the cooled aluminum alloy extended extrusion bar on a continuous rolling mill at a rolling-in temperature of 500 - 520°C to obtain a 10 - 14 mm aluminum alloy rod, and cooling the aluminum alloy rod with on-line cooling water, and winding it up using an automatic wire take-up device.

[0156] The thermomechanical treatment step includes: first, solution treatment at 510 - 530°C for 1.5 - 2.5 h followed by water quenching, and then pre-aging treatment at 185°C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25°C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500°C, and drawing treatment is carried out in a low-speed and small-deformation drawing mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain a 7 mm aluminum alloy drawn wire; next, final aging treatment is carried out by holding at an aging temperature of 120°C for 8 h and then at an aging temperature of 155°C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0157] Example 16

[0158] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 is that no pre-aging treatment is carried out in the thermomechanical treatment step, and it includes a raw material preheating step, a melting step, an in-furnace refining step, a horizontal continuous casting step, an extended extrusion step, a continuous rolling step, and a thermomechanical treatment step.

[0159] Among them, the steps of the raw material preheating step, the melting step, the in-furnace refining step, the horizontal continuous casting step, the extended extrusion step, and the continuous rolling step are the same as those in Example 1.

[0160] The thermomechanical treatment step includes: first, solution treatment at 510 - 530°C for 1.5 - 2.5 h followed by water quenching; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25°C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500°C, and drawing treatment is carried out in a low-speed and small-deformation drawing mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain a 7 mm aluminum alloy drawn wire; next, final aging treatment is carried out by holding at an aging temperature of 120°C for 8 h and then at an aging temperature of 155°C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0161] Example 17

[0162] This embodiment provides a method for preparing a creep-resistant, high-strength, and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the preparation method differs from Example 1 in that no continuous rolling mill is used. The preparation method includes a raw material preheating step, a smelting step, a furnace refining step, a horizontal continuous casting step, an extended extrusion step, and a deformation heat treatment step.

[0163] The raw material preheating step includes: preparing Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy and AlB3 boronizing agent according to the ratio of Mg: 0.65wt.%, Si: 0.60wt.%, Be: 0.12wt.%, Ti: 0.03wt.%, Fe: 0.20wt.%, B: 0.05wt.%, Mo: 0.20wt.%, Co: 0.25wt.%, and the rest being Al and other inevitable impurity elements (the total content of impurity elements is less than 0.02wt.%), and then placing the raw materials in a drying oven and preheating them at 200°C for 30 minutes, and preheating the mold and industrial pure aluminum at 250°C for the same time.

[0164] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0165] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0166] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0167] The extended extrusion step includes: after cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting, feeding it into the aluminum alloy extended extrusion machine, where the metal will flow fully to both sides. The rotational speed of the extended continuous extrusion wheel is 18 - 20 rpm, and the diameter of the die at the outlet of the extended continuous extrusion is 16 - 18 mm; after being friction-driven by the extrusion wheel, it directly enters the die expansion cavity, and after entering the sizing zone of the die, it is extruded into a product. Finally, the rod material enters the water pool near the die opening and is cooled online to room temperature.

[0168] The thermomechanical treatment step includes: first, solution treatment at 510 - 530 °C for 1.5 - 2.5 h followed by water quenching, and then pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, with an extrusion wheel rotational speed of 15 rpm and a die outlet temperature of approximately 500 °C, drawing treatment is carried out in a low-speed and small deformation mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the cone angle 2α of the drawing die is 16°, and the reduction per pass is 20% to obtain an aluminum alloy drawn wire of 7 mm; next, final aging treatment is carried out by holding at an aging temperature of 120 °C for 8 h and then at 155 °C for 3 h; after the final aging treatment, it is cooled at room temperature, and finally, it is appropriately cut and adjusted according to the required length of the wire to obtain the creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0169] Example 18

[0170] This example provides a preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material. As a comparison with Example 1, the difference in the preparation method from Example 1 is that no final aging treatment is carried out in the thermomechanical treatment step, and it includes steps such as raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, extended extrusion step, continuous rolling step, and thermomechanical treatment step.

[0171] Among them, the steps of the raw material preheating step, melting step, in-furnace refining step, horizontal continuous casting step, extended extrusion step, and continuous rolling step are the same as those in Example 1.

[0172] The raw material preheating step includes: preparing Al - Si master alloy, Al - Ti master alloy, Al - Fe master alloy, Al - Be master alloy, Al - Mo master alloy, Al - Co master alloy, and AlB3 boronizing agent according to the ratio of Mg: 0.65 wt.%, Si: 0.60 wt.%, Be: 0.12 wt.%, Ti: 0.03 wt.%, Fe: 0.20 wt.%, B: 0.05 wt.%, Mo: 0.20 wt.%, Co: 0.25 wt.%, and the rest being Al and inevitable other impurity elements (the total content of impurity elements is less than 0.02 wt.%). Then, the raw materials are placed in a drying oven and preheated at 200 °C for 30 min, and the die and industrial pure aluminum are preheated at 250 °C for the same time.

[0173] The smelting steps include: smelting an industrial pure aluminum ingot with a purity of not less than 99.85% at 720°C, raising the temperature to 750°C after the aluminum ingot is completely melted, adding preheated pure magnesium ingots, Al-Si and Al-Be master alloys, and keeping warm for 40 minutes, stirring once every 10 minutes, stirring and skimming the slag after heating and melting, fully stirring the molten aluminum alloy liquid, taking samples for spectral analysis, and controlling the composition of the aluminum liquid melt to be within the required range to obtain the aluminum alloy liquid.

[0174] The furnace refining steps include: transferring the aluminum alloy liquid in the smelting furnace to the holding furnace, adding a trace amount of AlB3 for boronization treatment, fully stirring, then cooling to 720°C, introducing high-purity argon and refining agent to degas and refine the aluminum alloy liquid respectively for 12 minutes, and then adding a covering agent and standing for 35 minutes to thoroughly clean the surface slag; the refining agent used is hexachloroethane, the amount of which is 0.20% of the melt mass, and the amount of the covering agent used is 0.50% of the melt mass, and its components and mass percentages are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0175] The horizontal continuous casting step includes: casting the refined aluminum alloy liquid into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 25-28 mm.

[0176] The expansion extrusion steps include: cleaning and drying the surface of the aluminum alloy rod obtained by horizontal continuous casting and feeding it into the aluminum alloy expansion extruder. The metal will flow fully to both sides. The speed of the expansion continuous extrusion wheel is 18-20rpm, and the diameter of the expansion continuous extrusion die is 16-18mm. After being driven by friction of the extrusion wheel, it directly enters the mold expansion cavity, enters the mold sizing belt, and is extruded into a product. Finally, the rod material enters the water pool near the die mouth for online cooling to room temperature.

[0177] The continuous rolling step includes: rolling the cooled aluminum alloy expanded extruded strip on a continuous rolling mill at a rolling temperature of 500-520°C to obtain a 10-14mm aluminum alloy rod, cooling the aluminum alloy rod with online cooling water, and winding it with an automatic winding device.

[0178] The thermomechanical treatment steps include: first, solution treatment at 510 - 530 °C for 1.5 - 2.5 h followed by water quenching, then pre-aging treatment at 185 °C for 0.5 h; subsequently, drawing treatment is carried out using a drawing machine. At room temperature of 25 °C, the extrusion wheel rotates at a speed of 15 rpm, the die outlet temperature is about 500 °C, and drawing treatment is carried out in a low-speed and small-deformation drawing mode with a drawing rate of 1 m / min; according to the principle of minimum drawing force, the drawing die cone angle 2α = 16°, and the single-pass processing rate is 20% to obtain 7-mm aluminum alloy drawn wire; after cooling at room temperature, appropriate cutting and adjustment are carried out according to the required length of the wire to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

[0179] Experimental Example 1

[0180] In this experimental example, the aluminum alloy wire materials provided in Examples 1 - 18 were subjected to performance tests. The performance tests included tensile strength tests and electrical conductivity tests. The tensile strength tests were carried out with reference to the standard GB / T 228.1 - 2010, the electrical conductivity tests were carried out with reference to the standard GB / T 12966 - 2008, and the deformation amount of the creep resistance performance was carried out with reference to Appendix B of the standard GB / T 30552 - 2014. The test results are shown in Table 1.

[0181] Table 1: Test results of tensile strength, electrical conductivity, and creep resistance performance of aluminum alloy wire materials

[0182]

[0183] As can be seen from the above examples, the aluminum alloy wire materials provided by the technical solution of this application, through the introduction of Be, Mo, and Co elements, boronization treatment with AlB3, the introduction of the extended extrusion process between the aluminum alloy continuous casting and rolling processes, pre-aging treatment after solution heat treatment, and final aging treatment after drawing treatment, etc., double improvements in components and preparation processes, can effectively reduce the impurity content of the aluminum alloy wire materials, improve the microstructure of the aluminum alloy wire materials, ensure higher strength of the materials while increasing the electrical conductivity of the aluminum alloy wire materials, realize the improvement of precipitation strengthening and dislocation strengthening, improve the creep performance while increasing the alloy strength and electrical conductivity. On the basis of the lightweight of the obtained aluminum alloy wire materials, they also have excellent electrical conductivity, creep resistance, and strength, so that the comprehensive performance of the aluminum alloy wire materials is improved, meeting the comprehensive performance requirements of aluminum alloy wires for new energy vehicles.

[0184] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A creep-resistant high-strength and high-conductivity aluminum alloy wire material, characterized in that, Comprising: Al: 97.60 - 98.54 wt.%, Mg: 0.60 - 0.70 wt.%, Si: 0.55 - 0.65 wt.%, Ti not more than 0.05 wt.%, Fe not more than 0.25 wt.%; The creep-resistant high-strength and high-conductivity aluminum alloy wire material further comprises a modification component, and the modification component is selected from at least two of Be, Mo, and Co. Among them, Be: 0.05 - 0.15 wt.%, Mo: 0.10 - 0.25 wt.%, Co: 0.15 - 0.25 wt.%.

2. The creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 1, characterized in that, The creep-resistant high-strength and high-conductivity aluminum alloy wire material further comprises: B: 0.01 - 0.10 wt.%.

3. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to any one of claims 1-2, characterized in that, Including the following steps: Step S1: Preheat at least two of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ti master alloy, Al-Fe master alloy, and Al-Be master alloy, Al-Mo master alloy, Al-Co master alloy to obtain preheated raw materials; Step S2: Successively carry out melting, refining, and continuous casting on the preheated raw materials to obtain an aluminum alloy continuous casting bar; Step S3: Feed the aluminum alloy continuous casting bar into an extended extrusion machine for extended extrusion to obtain an aluminum alloy extended extrusion bar; Step S4: Successively carry out continuous rolling, solution treatment, quenching, pre-aging treatment, drawing treatment, and final aging treatment on the aluminum alloy extended extrusion bar to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

4. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 3, characterized in that, In Step S2, the refining process includes: successively carry out AlB3 boronization treatment, degassing and refining, and impurity removal on the aluminum alloy liquid to obtain refined aluminum alloy liquid.

5. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 3, characterized in that, In Step S3, the extended extrusion process includes: driven by an extended continuous extrusion wheel with a rotational speed of 18 - 20 rpm, feed the aluminum alloy continuous casting bar into the extended extrusion machine for extended extrusion and then pass through a die with a diameter of 16 - 18 mm to obtain an aluminum alloy extended extrusion bar.

6. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 3, characterized in that, In Step S4, the solution treatment process includes: carry out solution treatment at a temperature of 500°C - 550°C for 1.5 - 2.5 h.

7. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 3, characterized in that, In Step S4, the pre-aging treatment process includes: carry out pre-aging treatment at a temperature of 185°C - 235°C for 0.1 - 1.0 h to obtain a pre-aged aluminum alloy rod; The final aging treatment process includes: successively keep warm at an aging temperature of 100 - 140°C for 6 - 10 h and at an aging temperature of 130 - 170°C for 1 - 5 h to obtain a creep-resistant high-strength and high-conductivity aluminum alloy wire material.

8. The preparation method of a creep-resistant high-strength and high-conductivity aluminum alloy wire material according to claim 3, characterized in that, In Step S4, the drawing treatment process includes: driven by an extrusion wheel with a rotational speed of 10 - 20 rpm, feed the pre-aged aluminum alloy rod into a drawing machine and draw it through a die with a taper angle 2α = 10 - 20° and an outlet temperature of 450 - 550°C at a drawing rate of 0.5 - 2 m / min to obtain an aluminum alloy wire with a diameter of 3 - 7 mm.

9. Application of the high-strength and high-conductivity aluminum alloy wire material prepared by the preparation method according to any one of claims 3 - 8 in new energy vehicles.

10. A wire for a new energy vehicle, characterized in that, Comprising from the inside to the outside a creep-resistant high-strength and high-conductivity aluminum alloy wire prepared by the preparation method according to any one of claims 3 - 8, an insulating layer, and a sheath.

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