High-strength high-conductivity aluminum alloy wire, preparation method and application thereof

Abstract

The application belongs to the technical field of aluminum alloy, and particularly relates to a high-strength and high-conductivity aluminum alloy wire rod and a preparation method and application thereof. The high-strength and high-conductivity aluminum alloy wire rod is improved by simultaneously adding Be, Ni and Ca. Meanwhile, the solid solution heat treatment and aging heat treatment in the preparation method of the aluminum alloy wire rod are optimized, three-stage solid solution heat treatment with temperature increment and three-stage aging heat treatment with temperature increment are adopted, and the temperature of the three-stage solid solution heat treatment and the three-stage aging heat treatment with temperature increment is improved, so that the aluminum alloy wire rod with high strength and conductivity is provided, and the technical problem that there is lack of Al-Mg-Si alloy material with high conductivity and high strength in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the field of aluminum alloy technology, and in particular relates to a high-strength and high-conductivity aluminum alloy wire and its preparation method and application. Background Art

[0002] Al-Mg-Si alloy among aluminum alloy conductor materials has high specific strength and good conductivity, processing performance and corrosion resistance, and is one of the best choices as a conductive structural material; but with the rapid development of my country's ultra-high voltage transmission, photovoltaic power generation, wind power generation, 5G communications, new energy vehicles, high-speed railways and other new energy and new infrastructure industries, the requirements for the strength and conductivity of aluminum alloy conductor materials are becoming higher and higher, and ordinary Al-Mg-Si alloys are difficult to meet the requirements.

[0003] In order to improve the mechanical properties of Al-Mg-Si alloys, traditional processes such as alloying, strain hardening, and plastic deformation have been used to strengthen Al-Mg-Si alloys. However, although these processes improve the mechanical properties of Al-Mg-Si alloys, they reduce the electrical conductivity of Al-Mg-Si alloys. In large-capacity transmission lines such as ultra-high voltage transmission, in order to reduce power loss, the electrical conductivity of aluminum alloy conductor materials is very high. When the lines cross wide rivers and mountains, high mechanical properties such as tensile strength of aluminum alloy conductor materials are also required. Therefore, it is necessary to conduct further research on Al-Mg-Si alloys to provide Al-Mg-Si alloy materials with both high conductivity and high strength. Summary of the Invention

[0004] In view of this, the present application provides a high-strength and high-conductivity aluminum alloy wire and a preparation method and application thereof, which are used to solve the technical problem in the prior art of the lack of Al-Mg-Si alloy materials with both high conductivity and high strength.

[0005] In a first aspect, the present application provides a high-strength and high-conductivity aluminum alloy wire, the raw material composition of which includes: Al: 97.90~98.50wt%, Mg: 0.60~0.80wt%, Si: 0.55~0.70wt%, Be: 0.10~0.16wt%, Ni: 0.15~0.24wt%, Ca: 0.05~0.08wt%, and B: 0.01~0.10wt%.

[0006] Preferably, the addition mass ratio of Be, Ni and Ca in the aluminum alloy wire is 2:3:1.

[0007] A second aspect of the present application provides a method for preparing a high-strength and high-conductivity aluminum alloy wire, which can be used to prepare the high-strength and high-conductivity aluminum alloy wire described in the first aspect. The preparation method comprises the following steps:

[0008] Step S1, melt the aluminum ingot, magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy and Al-Ca intermediate alloy in turn, add AlB3 boronizing treatment, refining, continuous casting and rolling to obtain an aluminum alloy rod;

[0009] Step S2, the aluminum alloy rod is subjected to a temperature-increasing multi-stage solid solution heat treatment, and after room temperature quenching, a heat-treated aluminum alloy rod is obtained.

[0010] Step S3, the heat-treated aluminum alloy rod is subjected to a multi-pass drawing treatment to obtain an aluminum alloy wire.

[0011] Step S4, the aluminum alloy wire is subjected to a temperature-increasing multi-stage aging heat treatment, and after room temperature cooling, a high-strength high-conductivity aluminum alloy wire is obtained.

[0012] Preferably, in step S2, the temperature-increasing multi-stage solid solution heat treatment is specifically: sequentially performing solid solution heat treatment at 460-520℃ for 40-50min, at 490-535℃ for 30-40min, and at 520-580℃ for 20-30min.

[0013] Preferably, in step S2, the temperature-increasing multi-stage solid solution heat treatment is specifically: sequentially performing solid solution heat treatment at 485-495℃ for 40-50min, at 515-525℃ for 30-40min, and at 530-540℃ for 20-30min.

[0014] Preferably, in step S4, the temperature-increasing multi-stage aging heat treatment is specifically: sequentially performing aging treatment at 60-125℃ for 2-4h, at 85-170℃ for 10-12h, and at 125-200℃ for 6-8h.

[0015] Preferably, in step S4, the temperature-increasing multi-stage aging heat treatment is specifically: sequentially performing aging treatment at 80-90℃ for 2-4h, at 100-130℃ for 10-12h, and at 165-175℃ for 6-8h.

[0016] Preferably, in step S3, the multi-pass drawing treatment is specifically: 7-9 passes of drawing treatment, with a single-pass drawing deformation of 10%-12% and a drawing speed of 12-15m / s.

[0017] Preferably, in step S1, the boronizing treatment is specifically: adding AlB3 and performing boronizing treatment at 710-760℃ for 20-40min.

[0018] Preferably, in step S1, the refining specifically comprises: introducing argon gas and then sequentially adding a refining agent and a covering agent for refining.

[0019] Preferably, in step S1, the continuous casting and rolling specifically comprises: sequentially using a continuous casting mold and a continuous rolling mill to perform continuous casting and rolling.

[0020] The third aspect of the present application provides the application of the high-strength and high-conductivity aluminum alloy wire described in the first aspect in wires and cables.

[0021] In summary, the present application provides a high-strength and high-conductivity aluminum alloy wire, a preparation method, and an application. The raw material composition of the high-strength and high-conductivity aluminum alloy wire provided in the present application includes: Al: 97.90~98.50wt%, Mg: 0.60~0.80wt%, Si: 0.55~0.70wt%, Be: 0.10~0.16wt%, Ni: 0.15~0.24wt%, Ca: 0.05~0.08wt%, B: 0.01~0.10wt%; by simultaneously introducing Be, Ni, and Ca, multi-scale particle modification and micro-alloying element composite strengthening are carried out, while improving the tensile strength of the aluminum alloy wire, the conductivity of the aluminum alloy wire can also be improved, thereby solving the technical problem in the prior art of the lack of Al-Mg-Si alloy materials with both high conductivity and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 Schematic diagram of the microstructure of a heat-treated aluminum alloy rod, an aluminum alloy wire obtained by multi-pass drawing treatment, and an aluminum alloy wire after multi-stage aging heat treatment in a method for preparing a high-strength and high-conductivity aluminum alloy wire provided in Example 1 of the present application. DETAILED DESCRIPTION

[0024] The present application provides a high-strength and high-conductivity aluminum alloy wire and its preparation method and application, which are used to solve the technical problem in the prior art of the lack of Al-Mg-Si alloy materials with both high conductivity and high strength.

[0025] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0026] In view of the fact that ordinary Al-Mg-Si alloys cannot have both high conductivity and high strength, and there is currently a lack of high-strength and high-conductivity aluminum alloy wires, the present application provides a high-strength and high-conductivity aluminum alloy wire. The raw material composition of the high-strength and high-conductivity aluminum alloy wire includes: Al: 97.90~98.50wt%, Mg: 0.60~0.80wt%, Si: 0.55~0.70wt%, Be: 0.10~0.16wt%, Ni: 0.15~0.24wt%, Ca: 0.05~0.08wt% , B: 0.01~0.10wt%; Al, Mg, Si, Be, Ni, Ca, and B in the raw materials are introduced through aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3, respectively. Al, Mg, and Si in the raw materials are the main components of the high-strength and high-conductivity aluminum alloy wire provided in this application. The high-strength and high-conductivity aluminum alloy wire provided in this application belongs to the Al-Mg-Si alloy in the aluminum alloy, and the B in the raw materials is mainly boron. The invention also introduces Be, Ni, and Ca into the raw materials at the same time. When two raw materials are selected from Be, Ni, and Ca and added, the tensile strength of the aluminum alloy wire is 315-328 MPa and the conductivity is 53.6%-55% IACS. When Be, Ni, and Ca are added simultaneously, the tensile strength of the aluminum alloy wire is 342 MPa and the conductivity is 55.2% IACS. This shows that the addition of Be, Ni, and Ca to the aluminum alloy wire can be used for multi-scale particle modification and microalloying element composite strengthening. The added Be and Ca elements can significantly improve the conductive properties of the alloy. Be and Ni elements can significantly strengthen the alloy. In addition, the Al3Ni phase precipitated by the Ni element in the aluminum alloy pins dislocations and grain boundaries, hindering the movement of dislocations and grain boundaries, thereby improving the comprehensive properties of the aluminum alloy such as tensile strength and conductivity. Therefore, while improving the mechanical properties such as tensile strength of the aluminum alloy wire, the conductivity of the aluminum alloy wire can also be improved, overcoming the current lack of Al-Mg-Si alloy materials with both high conductivity and high strength.

[0027] Preferably, for the addition amounts of Be, Ni, and Ca in a high-strength and high-conductivity aluminum alloy wire provided in the present application, the addition mass ratio of Be, Ni, and Ca is controlled to be 2:3:1.

[0028] Preferably, the present application provides a corresponding preparation method for high-strength and high-conductivity aluminum alloy wire, the preparation method comprising: first melting aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, and Al-Ca master alloys, and then adding AlB3 boronization treatment, followed by refining, and using a continuous casting mold and a continuous rolling mill for continuous casting and rolling to obtain an aluminum alloy rod; then performing multi-stage solid solution heat treatment with increasing temperature, multi-pass drawing treatment, and multi-stage aging heat treatment with increasing temperature.

[0029] In the preparation method of the high-strength and high-conductivity aluminum alloy wire provided in the present application, the multi-stage solution heat treatment with increasing temperature is three solution heat treatments in sequence; the first two solution heat treatments in the multi-stage solution heat treatment with increasing temperature dissolve the coarse second phase in the aluminum alloy microstructure and improve the supersaturation of solute atoms, and the third solution heat treatment in the multi-stage solution heat treatment further promotes the increase in the solid solubility of Mg and Si atoms, resulting in the presence of more Mg and Si atoms, and the precipitation of Mg2Si phase formed by Mg and Si atoms increases, thereby enhancing the alloy performance of the aluminum alloy; thereby enhancing the tensile strength, conductivity and other properties of the aluminum alloy wire.

[0030] In the preparation method of the high-strength and high-conductivity aluminum alloy wire provided in the present application, the multi-stage aging heat treatment with increasing temperature is a three-stage aging heat treatment; the first two aging heat treatments in the multi-stage aging heat treatment with increasing temperature enable the formation of aging clusters and heterogeneous nucleation points of the β" phase, while the third aging heat treatment in the multi-stage solid solution heat treatment promotes the further formation of a large number of precipitated phases from the heterogeneous nucleation points of the aging clusters and the β" phase; thereby enhancing the tensile strength, electrical conductivity and other properties of the aluminum alloy wire.

[0031] In the preparation method of the high-strength and high-conductivity aluminum alloy wire provided in the present application, the temperature of the three-stage solid solution heat treatment is also optimized; the further preferred three-stage solid solution heat treatment is sequentially carried out at 485-495°C for 40-50 minutes, at 515-525°C for 30-40 minutes, and at 530-540°C for 20-30 minutes; by regulating the temperature of the solid solution heat treatment, the defect of reducing the supersaturation of solute atoms in the solid solution due to the inability to fully dissolve the coarse second phase in the organization when the temperatures of the first two solid solution heat treatments are too low can be avoided, and the defect of reducing the supersaturation of solute atoms in the solid solution can be avoided. When the temperature of the first solution heat treatment is too low, the diffusion rate of the alloying elements in the matrix is ​​low, which makes the solute atoms diffuse unevenly and causes the defect of reducing the density of the precipitated phase during the subsequent aging treatment. It also avoids the defect of excessive grain growth caused by the sufficient dissolution of the coarse second phase in the structure when the temperature of the first two solution heat treatments is too high. It also avoids the defect of incomplete precipitation of Mg and Si atoms to form Mg2Si phase when the temperature of the third solution heat treatment is too high due to the increase of the solid solubility of Mg and Si atoms and the presence of more Mg and Si atoms in the matrix. Thus, the tensile strength, electrical conductivity and other properties of the aluminum alloy wire are further improved.

[0032] In the preparation method of the high-strength and high-conductivity aluminum alloy wire provided in the present application, the temperature of the three-stage aging heat treatment is also optimized. The multi-stage aging heat treatment with increasing temperature is sequentially performed at 80-90°C for 2-4 hours, 100-130°C for 10-12 hours, and 165-175°C for 6-8 hours. By regulating the aging treatment temperature, the defects of the first two aging heat treatments, which result in fewer aging clusters and thus fewer heterogeneous nucleation sites for the β" phase, and thus fewer precipitates formed, can be avoided. The defects of the third aging heat treatment, which result in fewer precipitates, can also be avoided. The defects of the first two aging heat treatments, which result in larger aging clusters and fewer precipitates, can also be avoided. The defects of the third aging heat treatment, which result in smaller and more voluminous precipitates, can also be avoided. The tensile strength, electrical conductivity, and other properties of the aluminum alloy wire can thus be further improved.

[0033] The following will explain the high-strength and high-conductivity aluminum alloy wire in combination with the preparation method and performance testing of the high-strength and high-conductivity aluminum alloy wire.

[0034] Example 1

[0035] Example 1 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, which includes: preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing the aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0036] The steps of preparing the aluminum alloy rod include:

[0037] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.12 wt%, Ni: 0.18 wt%, Ca: 0.06 wt%, and B: 0.08 wt%.

[0038] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, the pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0039] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0040] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0041] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0042] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490℃, the holding time was 45min, then the temperature was raised to 520℃ for the second stage solid solution heat treatment, the holding time was 35min, and the temperature was further raised to 535℃ for the third stage solid solution heat treatment, the holding time was 25min, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the aluminum alloy rod after heat treatment, and its microstructure is as follows: Figure 1 As shown in Figure (a).

[0043] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0044] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% per pass and a drawing rate of 14 m / min. The microstructure is as follows Figure 1 As shown in Figure (b).

[0045] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0046] The aluminum alloy wire was subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature was 85℃, the holding time was 3h, then the temperature was raised to 125℃ for the second stage aging heat treatment, the holding time was 11h, and the temperature was further raised to 170℃ for the third stage aging heat treatment, the holding time was 7h, and the high-strength and high-conductivity aluminum alloy wire was obtained by cooling at room temperature. Its microstructure is as follows Figure 1 As shown in Figure (c).

[0047] Example 2

[0048] Example 2 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that the amount of raw materials and process parameters such as temperature and time are adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing a multi-stage solid solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0049] The steps of preparing the aluminum alloy rod include:

[0050] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy, Al-Ca master alloy, and AlB3 in a ratio of Al: 98.05 wt%, Mg: 0.78 wt%, Si: 0.65 wt%, Be: 0.14 wt%, Ni: 0.21 wt%, Ca: 0.07 wt%, and B: 0.1 wt%.

[0051] The pure aluminum ingot is melted at 730°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace and is heated to 760°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace and kept warm for 50 minutes. The alloy is stirred every 10 minutes, and then a trace amount of AlB3 is added to the melt for 40 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0052] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 710°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 15 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.25% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0053] The refined aluminum alloy liquid was cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 16 mm. The aluminum alloy continuous casting bar was then rolled on a continuous rolling mill with a rolling temperature of 520°C to produce a 10 mm aluminum alloy rod. The aluminum alloy rod was cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0054] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0055] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 495°C, the holding time was 40 minutes, then the temperature was raised to 525°C for the second stage solid solution heat treatment, the holding time was 30 minutes, and the temperature was further raised to 540°C for the third stage solid solution heat treatment, the holding time was 30 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0056] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0057] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 4 mm through 7 passes, with a deformation of 12% in each pass and a drawing rate of 15 m / min.

[0058] The steps of performing multi-stage aging heat treatment on the aluminum alloy wire include: performing three-stage aging heat treatment with increasing temperature on the aluminum alloy wire; the first stage aging heat treatment temperature is 90°C, the holding time is 2 hours, then the temperature is raised to 130°C for the second stage aging heat treatment, the holding time is 10 hours, and the temperature is further raised to 175°C for the third stage aging heat treatment, the holding time is 6 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0059] Example 3

[0060] Example 3 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that the amount of raw materials and process parameters such as temperature and time are adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing a multi-stage solid solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multiple drawing processes, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0061] The steps of preparing the aluminum alloy rod include:

[0062] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy, Al-Ca master alloy, and AlB3 in a ratio of Al: 98.42 wt%, Mg: 0.62 wt%, Si: 0.58 wt%, Be: 0.10 wt%, Ni: 0.15 wt%, Ca: 0.05 wt%, and B: 0.8 wt%.

[0063] The pure aluminum ingot is melted at 710°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace and is heated to 740°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace and kept warm for 50 minutes. The alloy is stirred every 10 minutes, and then a trace amount of AlB3 is added to the melt for 20 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0064] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 710°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 15 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.1% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0065] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0066] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0067] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 485°C, the holding time was 50 minutes, then the temperature was raised to 515°C for the second stage solid solution heat treatment, the holding time was 40 minutes, and the temperature was further raised to 530°C for the third stage solid solution heat treatment, the holding time was 20 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0068] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0069] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.2 mm through 8 passes, with a deformation of 12% in each pass and a drawing rate of 12 m / min.

[0070] The steps of performing multi-stage aging heat treatment on the aluminum alloy wire include: performing three-stage aging heat treatment with increasing temperature on the aluminum alloy wire; the first-stage aging heat treatment temperature is 80°C, the holding time is 4 hours, then the temperature is raised to 120°C for the second-stage aging heat treatment, the holding time is 12 hours, the temperature is further raised to 165°C for the third-stage aging heat treatment, the holding time is 8 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0071] Example 4

[0072] Example 4 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that the amount of raw materials is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing a multi-stage solid solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0073] The steps of preparing the aluminum alloy rod include:

[0074] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy, Al-Ca master alloy, and AlB3 in a ratio of Al: 98.11 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.16 wt%, Ni: 0.24 wt%, Ca: 0.08 wt%, and B: 0.1 wt%;

[0075] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0076] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0077] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0078] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0079] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490°C, the holding time was 45 minutes, then the temperature was raised to 520°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 535°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0080] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0081] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0082] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0083] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0084] Example 5

[0085] The embodiment 5 of the application provides a preparation method of high-strength and high-conductivity aluminum alloy wire rod. The preparation method is different from the embodiment 1 in that the amount of raw materials is adjusted. The preparation method comprises the following steps: a step of preparing an aluminum alloy rod, a step of performing multi-stage solid solution heat treatment on the aluminum alloy rod, a step of preparing an aluminum alloy wire rod through multi-pass drawing, and a step of performing multi-stage aging heat treatment on the aluminum alloy wire rod.

[0086] The step of preparing the aluminum alloy rod comprises the following steps:

[0087] According to the proportions of Al: 98.32wt%, Mg: 0.71wt%, Si: 0.60wt%, Be: 0.10wt%, Ni: 0.15wt%, Ca: 0.05wt% and B: 0.07wt%, the corresponding aluminum ingot, magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy, Al-Ca intermediate alloy and AlB3 are weighed to a total of 100Kg.

[0088] The pure aluminum ingot is melted at 720℃, the completely melted aluminum liquid is flowed into the holding furnace through a flow channel connected with the holding furnace, the temperature is raised to 750℃, then the pure magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy and Al-Ca intermediate alloy are added into the aluminum liquid in the holding furnace, and the temperature is kept for 40min, and the stirring is performed once every 10min, then a small amount of AlB3 is added for 30min boronizing treatment of the melt, and after heating and melting, the slag is stirred and removed, and the melted aluminum alloy liquid is fully stirred and uniformly distributed.

[0089] Then the aluminum alloy liquid in the holding furnace is fully stirred and cooled to 720℃, high-purity argon and a refining agent are introduced to remove gas and refine the aluminum alloy liquid, the time is 12min, then a covering agent is added and the surface dross is completely cleaned after standing for 30min, to obtain the refined aluminum alloy liquid; the refining agent used is hexachloroethane, and the amount is 0.15% of the aluminum alloy liquid; the amount of the covering agent used is 0.1%, and the components are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0090] The refined aluminum alloy liquid is cast into a continuous casting mold to obtain an aluminum alloy continuous casting strip with a diameter of 18mm, then the aluminum alloy continuous casting strip is rolled on a continuous rolling mill, the rolling-in temperature is 500℃, an aluminum alloy rod with a diameter of 12mm is prepared, the aluminum alloy rod is cooled through online cooling water, and the automatic take-up device is used for winding to obtain the aluminum alloy rod.

[0091] The step of performing multi-stage solid solution heat treatment on the aluminum alloy rod comprises the following steps:

[0092] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490°C, the holding time was 45 minutes, then the temperature was raised to 520°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 535°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0093] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0094] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0095] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0096] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0097] Example 6

[0098] Example 6 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that the temperature of the solution heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0099] The steps of preparing the aluminum alloy rod include:

[0100] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.12 wt%, Ni: 0.18 wt%, Ca: 0.06 wt%, and B: 0.08 wt%.

[0101] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0102] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0103] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0104] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0105] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 460°C, the holding time was 45 minutes, then the temperature was raised to 520°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 535°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0106] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0107] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0108] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0109] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0110] Example 7

[0111] Example 7 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that the temperature of the solution heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0112] The steps of preparing the aluminum alloy rod include:

[0113] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.12 wt%, Ni: 0.18 wt%, Ca: 0.06 wt%, and B: 0.08 wt%.

[0114] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0115] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0116] The refined aluminum alloy liquid is cast into a continuous casting mold to obtain an aluminum alloy continuous casting strip with a diameter of 18 mm, then the aluminum alloy continuous casting strip is rolled on a continuous rolling mill at an entry rolling temperature of 500 DEG C to obtain a 12 mm aluminum alloy rod, the aluminum alloy rod is cooled by online cooling water, and the aluminum alloy rod is wound by using an automatic take-up device.

[0117] The step of performing multi-stage solid solution heat treatment on the aluminum alloy rod comprises:

[0118] The aluminum alloy rod is subjected to three-stage solid solution heat treatment with increasing temperature; the first-stage solid solution heat treatment is performed at a temperature of 520 DEG C for 45 min, then the second-stage solid solution heat treatment is performed at a temperature of 520 DEG C for 35 min, and the third-stage solid solution heat treatment is performed at a temperature of 535 DEG C for 25 min, and the aluminum alloy rod after the third-stage solid solution heat treatment is quenched in room temperature water to obtain a heat-treated aluminum alloy rod.

[0119] The step of preparing the aluminum alloy wire through multi-pass drawing comprises:

[0120] The aluminum alloy solid solution rod is drawn through 9 passes to obtain an aluminum alloy wire with a diameter of 3.8 mm, and the deformation amount of each pass is 10% and the drawing speed is 14 m / min.

[0121] The step of performing multi-stage aging heat treatment on the aluminum alloy wire comprises:

[0122] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first-stage aging heat treatment is performed at a temperature of 85 DEG C for 3 h, then the second-stage aging heat treatment is performed at a temperature of 125 DEG C for 11 h, and the third-stage aging heat treatment is performed at a temperature of 170 DEG C for 7 h, and the aluminum alloy wire is cooled at room temperature to obtain a high-strength high-conductivity aluminum alloy wire.

[0123] Embodiment 8

[0124] Embodiment 8 of the present application provides a preparation method of a high-strength high-conductivity aluminum alloy wire, the temperature of solid solution heat treatment is adjusted, and the preparation method comprises the steps of preparing an aluminum alloy rod, performing multi-stage solid solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0125] The step of preparing an aluminum alloy rod comprises:

[0126] According to the proportion of Al: 98.25wt%, Mg: 0.71wt%, Si: 0.60wt%, Be: 0.12wt%, Ni: 0.18wt%, Ca: 0.06wt% and B: 0.08wt%, the corresponding aluminum ingot, magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy, Al-Ca intermediate alloy and AlB3 are weighed 100Kg in total;

[0127] The pure aluminum ingot is melted at 720℃, and the completely melted aluminum liquid is poured into the holding furnace through the flow channel connected with the holding furnace, and heated to 750℃, then the pure magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy and Al-Ca intermediate alloy are added into the aluminum liquid in the holding furnace, and the holding time is 40min, and the stirring is carried out every 10min, then a small amount of AlB3 is added for boronizing treatment of the melt for 30min, and after heating and melting, the slag is stirred and removed, and the melted aluminum alloy liquid is fully stirred and uniformly distributed;

[0128] Then the aluminum alloy liquid in the holding furnace is fully stirred and cooled to 720℃, and high-purity argon and refining agent are introduced to remove gas and refine the aluminum alloy liquid, respectively, for 12min, then a covering agent is added and placed for 30min, and the surface dross is thoroughly cleaned to obtain the refined aluminum alloy liquid; The refining agent used is hexachloroethane, and the amount is 0.15% of the aluminum alloy liquid; The amount of the covering agent used is 0.1%, and the components are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%;

[0129] The refined aluminum alloy liquid is poured into a continuous casting mold to obtain an aluminum alloy continuous casting strip with a diameter of 18mm, then the aluminum alloy continuous casting strip is rolled on a continuous rolling mill, the rolling-in temperature is 500℃, an aluminum alloy rod with a diameter of 12mm is obtained, and the aluminum alloy rod is cooled by online cooling water, and the aluminum alloy rod is wound by an automatic take-up device.

[0130] The steps of multi-stage solid solution heat treatment of the aluminum alloy rod include:

[0131] The aluminum alloy rod is subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature is 490℃, the holding time is 45min, then the temperature is raised to 490℃ for the second stage solid solution heat treatment, the holding time is 35min, and the temperature is continuously raised to 535℃ for the third stage solid solution heat treatment, the holding time is 25min, and the aluminum alloy rod is obtained after the third stage solid solution heat treatment and room temperature water quenching.

[0132] The steps of multi-pass drawing process for preparing the aluminum alloy wire include:

[0133] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, and the deformation amount of each pass is 10% and the drawing speed is 14 m / min.

[0134] The step of performing multi-stage aging heat treatment on the aluminum alloy wire includes:

[0135] The aluminum alloy wire is subjected to three-stage aging heat treatment with temperature increasing; the first-stage aging heat treatment is performed at 85℃ for 3h, then the temperature is increased to 125℃ for the second-stage aging heat treatment for 11h, and then the temperature is further increased to 170℃ for the third-stage aging heat treatment for 7h, and the high-strength high-conductivity aluminum alloy wire is obtained after room temperature cooling.

[0136] Embodiment 9

[0137] The embodiment 9 of the present application provides a preparation method of a high-strength high-conductivity aluminum alloy wire, which adjusts the temperature of solid solution heat treatment, and the preparation method includes the steps of preparing an aluminum alloy rod, performing multi-stage solid solution heat treatment on the aluminum alloy rod, multi-pass drawing to prepare an aluminum alloy wire, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0138] The step of preparing the aluminum alloy rod includes:

[0139] The corresponding aluminum ingot, magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy, Al-Ca intermediate alloy and AlB3 are weighed according to the proportions of Al: 98.25wt%, Mg: 0.71wt%, Si: 0.60wt%, Be: 0.12wt%, Ni: 0.18wt%, Ca: 0.06wt% and B: 0.08wt%, and the total weight is 100Kg;

[0140] The pure aluminum ingot is melted at 720℃, and the completely melted aluminum liquid is poured into the holding furnace through the flow channel connected to the holding furnace, and the temperature is increased to 750℃. Then, the pure magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy and Al-Ca intermediate alloy are added to the aluminum liquid in the holding furnace, and the temperature is maintained for 40min, and stirred every 10min. Then, a small amount of AlB3 is added for 30min boronizing treatment of the melt. After heating and melting, the slag is stirred and removed, and the melted aluminum alloy liquid is fully stirred and uniformly distributed;

[0141] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0142] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0143] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0144] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490°C, the holding time was 45 minutes, then the temperature was raised to 535°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 535°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0145] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0146] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0147] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0148] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0149] Example 10

[0150] Example 10 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the solution heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing the aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0151] The steps of preparing the aluminum alloy rod include:

[0152] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.12 wt%, Ni: 0.18 wt%, Ca: 0.06 wt%, and B: 0.08 wt%.

[0153] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, the pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0154] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0155] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0156] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0157] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490°C, the holding time was 45 minutes, then the temperature was raised to 520°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 520°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0158] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0159] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0160] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0161] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0162] Example 11

[0163] Example 11 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the solution heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing the aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0164] The steps of preparing the aluminum alloy rod include:

[0165] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloys, Al-Be master alloys, Al-Ni master alloys, Al-Ca master alloys, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.12 wt%, Ni: 0.18 wt%, Ca: 0.06 wt%, and B: 0.08 wt%.

[0166] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0167] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0168] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0169] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0170] The aluminum alloy rod was subjected to three-stage solid solution heat treatment with increasing temperature; the first stage solid solution heat treatment temperature was 490°C, the holding time was 45 minutes, then the temperature was raised to 520°C for the second stage solid solution heat treatment, the holding time was 35 minutes, and the temperature was further raised to 580°C for the third stage solid solution heat treatment, the holding time was 25 minutes, and after the third stage solid solution heat treatment, it was water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0171] The steps of preparing aluminum alloy wire by multi-pass drawing process include:

[0172] The aluminum alloy solid solution rod is drawn into an aluminum alloy wire with a diameter of 3.8 mm through 9 passes, with a deformation of 10% in each pass and a drawing rate of 14 m / min.

[0173] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0174] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0175] Example 12

[0176] Example 12 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0177] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0178] The steps of performing multi-stage aging heat treatment on the aluminum alloy wire include: subjecting the aluminum alloy wire to a temperature

[0179] Incremental three-stage aging heat treatment; the first stage aging heat treatment temperature is 60℃, the holding time is 3h, then the temperature is raised to 125℃ for the second stage aging heat treatment, the holding time is 11h, and the temperature is further raised to 170℃ for the third stage aging heat treatment, the holding time is 7h, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0180] Example 13

[0181] Example 13 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0182] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0183] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0184] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 125°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0185] Example 14

[0186] Example 14 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0187] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0188] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0189] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 85°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0190] Example 15

[0191] Example 15 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0192] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0193] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0194] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 170°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 170°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0195] Example 16

[0196] Example 16 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0197] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0198] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0199] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 125°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0200] Example 17

[0201] Example 17 of the present application provides a method for preparing high-strength and high-conductivity aluminum alloy wire, in which the temperature of the aging heat treatment is adjusted. The preparation method includes: the steps of preparing an aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through multi-pass drawing treatment, and performing multi-stage aging heat treatment on the aluminum alloy wire.

[0202] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0203] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0204] The aluminum alloy wire is subjected to three-stage aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the temperature is further raised to 200°C for the third stage aging heat treatment, the holding time is 7 hours, and the high-strength and high-conductivity aluminum alloy wire is obtained by cooling at room temperature.

[0205] Comparative Example 1

[0206] Comparative Example 1 of the present application provides a method for preparing an aluminum alloy wire. The preparation method differs from Example 1 in that Be is not added. The preparation method includes: preparing an aluminum alloy rod, performing a multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0207] The steps of preparing the aluminum alloy rod include:

[0208] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ni master alloy, Al-Ca master alloy, and AlB3 in a ratio of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Ni: 0.24 wt%, Ca: 0.12 wt%, and B: 0.08 wt%.

[0209] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0210] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0211] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0212] The steps of performing multi-stage solution heat treatment on the aluminum alloy rod, the steps of preparing the aluminum alloy wire by multi-pass drawing treatment, and the steps of performing multi-stage aging heat treatment on the aluminum alloy wire are the same as those in the embodiment.

[0213] Comparative Example 2

[0214] Comparative Example 2 of the present application provides a method for preparing an aluminum alloy wire. The preparation method differs from Example 1 in that no Ni is added. The preparation method includes: a step of preparing an aluminum alloy rod, a step of performing a multi-stage solid solution heat treatment on the aluminum alloy rod, a step of preparing an aluminum alloy wire through a multi-pass drawing process, and a step of performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0215] The step of preparing the aluminum alloy rod comprises:

[0216] The corresponding aluminum ingot, magnesium ingot, Al-Si intermediate alloy, Al-Ca intermediate alloy and AlB3 are weighed according to the proportions of Al: 98.25wt%, Mg: 0.71wt%, Si: 0.60wt%, Be: 0.21wt%, Ca: 0.15wt% and B: 0.08wt%, and the total weight is 100Kg;

[0217] The pure aluminum ingot is melted at 720℃, and the completely melted aluminum liquid is poured into the holding furnace through the flow channel connected to the holding furnace, and the temperature is raised to 750℃. Then, the pure magnesium ingot, Al-Si intermediate alloy, Al-Be intermediate alloy, Al-Ni intermediate alloy and Al-Ca intermediate alloy are added to the aluminum liquid in the holding furnace, and the temperature is maintained for 40min, with stirring every 10min. Then, a small amount of AlB3 is added for boronizing treatment of the melt for 30min. After heating and melting, the slag is stirred and removed, and the melted aluminum alloy liquid is fully stirred and uniformly distributed.

[0218] The aluminum alloy liquid in the holding furnace is then fully stirred and cooled to 720℃, and high-purity argon and refining agent are introduced to remove gas and refine the aluminum alloy liquid, respectively, for 12min. Then, a covering agent is added and left for 30min to completely remove the surface dross, obtaining the refined aluminum alloy liquid. The refining agent used is hexachloroethane, and the amount is 0.15% of the aluminum alloy liquid. The amount of the covering agent used is 0.1%, and the components are: NaCl: 45%, KCl: 45%, Na2SiF6: 8% and CaCO3: 2%.

[0219] The refined aluminum alloy liquid is poured into a continuous casting mold to obtain an aluminum alloy continuous casting strip with a diameter of 18mm. Then, the aluminum alloy continuous casting strip is rolled on a continuous rolling mill at an entry temperature of 500℃ to obtain a 12mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water, and the automatic take-up device is used for winding to obtain the aluminum alloy rod.

[0220] The steps of multi-stage solid solution heat treatment of the aluminum alloy rod, multi-pass drawing treatment to prepare the aluminum alloy wire, and the steps of multi-stage aging heat treatment of the aluminum alloy wire are the same as in the embodiment.

[0221] Comparative Example 3

[0222] The preparation method of the aluminum alloy wire provided in Comparative Example 3 of the present application is different from that of Embodiment 1 in that no Ca is added. The preparation method comprises the steps of preparing the aluminum alloy rod, multi-stage solid solution heat treatment of the aluminum alloy rod, multi-pass drawing treatment to prepare the aluminum alloy wire, and multi-stage aging heat treatment of the aluminum alloy wire.

[0223] The steps of preparing the aluminum alloy rod include:

[0224] Weigh 100 kg of aluminum ingots, magnesium ingots, Al-Si master alloy, Al-Ni master alloy, and AlB3 in the proportions of Al: 98.25 wt%, Mg: 0.71 wt%, Si: 0.60 wt%, Be: 0.15 wt%, Ni: 0.21 wt%, and B: 0.08 wt%.

[0225] The pure aluminum ingot is melted at 720°C, and the completely melted aluminum liquid flows into the holding furnace through a launder connected to the holding furnace, and the temperature is raised to 750°C. Then, pure magnesium ingot, Al-Si master alloy, Al-Be master alloy, Al-Ni master alloy and Al-Ca master alloy are added to the aluminum liquid in the holding furnace, and the temperature is kept for 40 minutes, and stirred every 10 minutes. Then, a trace amount of AlB3 is added to the melt for 30 minutes of boronization treatment. After heating and melting, the slag is stirred and skimmed, and the molten aluminum alloy liquid is fully stirred;

[0226] The aluminum alloy liquid in the holding furnace was then fully stirred and cooled to 720°C. High-purity argon and a refining agent were introduced to degas and refine the aluminum alloy liquid for 12 minutes. A covering agent was then added and allowed to stand for 30 minutes to thoroughly remove the surface slag, thereby obtaining a refined aluminum alloy liquid. The refining agent used was hexachloroethane, with a dosage of 0.15% of the aluminum alloy liquid. The covering agent used was 0.1%, and its components were: NaCl: 45%, KCl: 45%, Na2SiF6: 8%, and CaCO3: 2%.

[0227] The refined aluminum alloy liquid is cast into a continuous casting mold to produce an aluminum alloy continuous casting bar with a diameter of 18 mm. The aluminum alloy continuous casting bar is then rolled on a continuous rolling mill with a rolling temperature of 500°C to produce a 12 mm aluminum alloy rod. The aluminum alloy rod is cooled by online cooling water and wound using an automatic wire winding device to obtain the aluminum alloy rod.

[0228] The steps of performing multi-stage solution heat treatment on the aluminum alloy rod, the steps of preparing the aluminum alloy wire by multi-pass drawing treatment, and the steps of performing multi-stage aging heat treatment on the aluminum alloy wire are the same as those in the embodiment.

[0229] Comparative Example 4

[0230] Example 4 of the present application provides a method for preparing a high-strength and high-conductivity aluminum alloy wire. The preparation method differs from Example 1 in that no first solution heat treatment is performed. The preparation method includes: preparing an aluminum alloy rod, performing a multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0231] Among them, the steps of preparing the aluminum alloy rod, the step of preparing the aluminum alloy wire by multi-pass drawing treatment, and the step of performing multi-stage aging heat treatment on the aluminum alloy wire are the same as those in Example 1.

[0232] The steps of multi-stage solution heat treatment of aluminum alloy rods include:

[0233] The aluminum alloy rod is subjected to solution heat treatment with increasing temperature; the solution heat treatment is carried out at 520°C with a holding time of 35 minutes, the temperature is continuously raised to 535°C for solution heat treatment with a holding time of 25 minutes, and after the solution heat treatment, it is water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0234] Comparative Example 5

[0235] Comparative Example 5 of the present application provides a method for preparing a high-strength and high-conductivity aluminum alloy wire. The preparation method differs from Example 1 in that no second solution heat treatment is performed. The preparation method includes: preparing an aluminum alloy rod, performing a multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0236] Among them, the steps of preparing the aluminum alloy rod, the step of preparing the aluminum alloy wire by multi-pass drawing treatment, and the step of performing multi-stage aging heat treatment on the aluminum alloy wire are the same as those in Example 1.

[0237] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0238] The aluminum alloy rod is subjected to solution heat treatment with increasing temperature; the first stage solution heat treatment temperature is 490°C, the holding time is 45 minutes, and then the temperature is raised to 535°C for the second stage solution heat treatment, the holding time is 25 minutes, and after the second stage solution heat treatment, it is water quenched at room temperature to obtain the heat-treated aluminum alloy rod.

[0239] Comparative Example 6

[0240] Comparative Example 6 of the present application provides a method for preparing a high-strength and high-conductivity aluminum alloy wire. The difference between the preparation method and Example 1 is that no third solution heat treatment is performed. The preparation method includes: the steps of preparing an aluminum alloy rod, performing a multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0241] Among them, the steps of preparing the aluminum alloy rod, the step of preparing the aluminum alloy wire by multi-pass drawing treatment, and the step of performing multi-stage aging heat treatment on the aluminum alloy wire are the same as those in Example 1.

[0242] The steps for multi-stage solution heat treatment of aluminum alloy rods include:

[0243] The aluminum alloy rod is subjected to temperature-incremental solid solution heat treatment; the first-stage solid solution heat treatment temperature is 490 DEG C, the holding time is 45 min, then the temperature is raised to 520 DEG C for second-stage solid solution heat treatment, the holding time is 35 min, and the aluminum alloy rod is obtained after the second-stage solid solution heat treatment is quenched in water at room temperature.

[0244] Comparative Example 7

[0245] The embodiment 7 of the present application provides a preparation method of high-strength and high-conductivity aluminum alloy wire rod, which is different from the preparation method of the embodiment 1 in that the first-stage aging heat treatment is not performed, and the preparation method comprises the steps of preparing an aluminum alloy rod, subjecting the aluminum alloy rod to multi-stage solid solution heat treatment, preparing the aluminum alloy wire rod through multi-pass drawing, and subjecting the aluminum alloy wire rod to multi-stage aging heat treatment.

[0246] The steps of preparing the aluminum alloy rod, subjecting the aluminum alloy rod to multi-stage solid solution heat treatment, and preparing the aluminum alloy wire rod through multi-pass drawing are the same as those of the embodiment 1.

[0247] The step of subjecting the aluminum alloy wire rod to multi-stage aging heat treatment comprises:

[0248] The aluminum alloy wire rod is subjected to temperature-incremental aging heat treatment; the first-stage aging heat treatment temperature is 85 DEG C, the holding time is 3 h, then the temperature is raised to 170 DEG C for second-stage aging heat treatment, the holding time is 7 h, and the aluminum alloy wire rod is obtained after being cooled at room temperature.

[0249] Comparative Example 8

[0250] The embodiment 8 of the present application provides a preparation method of high-strength and high-conductivity aluminum alloy wire rod, which is different from the preparation method of the embodiment 1 in that the second-stage aging heat treatment is not performed, and the preparation method comprises the steps of preparing an aluminum alloy rod, subjecting the aluminum alloy rod to multi-stage solid solution heat treatment, preparing the aluminum alloy wire rod through multi-pass drawing, and subjecting the aluminum alloy wire rod to multi-stage aging heat treatment.

[0251] The steps of preparing the aluminum alloy rod, subjecting the aluminum alloy rod to multi-stage solid solution heat treatment, and preparing the aluminum alloy wire rod through multi-pass drawing are the same as those of the embodiment 1.

[0252] The step of subjecting the aluminum alloy wire rod to multi-stage aging heat treatment comprises:

[0253] The aluminum alloy wire rod is subjected to temperature-incremental aging heat treatment; the first-stage aging heat treatment temperature is 85 DEG C, the holding time is 3 h, then the temperature is raised to 170 DEG C for second-stage aging heat treatment, the holding time is 7 h, and the aluminum alloy wire rod is obtained after being cooled at room temperature.

[0254] Comparative Example 9

[0255] Comparative Example 9 of the present application provides a method for preparing a high-strength and high-conductivity aluminum alloy wire. The preparation method differs from Example 1 in that no third aging heat treatment is performed. The preparation method includes: preparing an aluminum alloy rod, performing a multi-stage solution heat treatment on the aluminum alloy rod, preparing an aluminum alloy wire through a multi-pass drawing process, and performing a multi-stage aging heat treatment on the aluminum alloy wire.

[0256] The steps of preparing the aluminum alloy rod, performing multi-stage solution heat treatment on the aluminum alloy rod, and preparing the aluminum alloy wire by multi-pass drawing are the same as those in Example 1.

[0257] The steps of multi-stage aging heat treatment of aluminum alloy wire include:

[0258] The aluminum alloy wire is subjected to aging heat treatment with increasing temperature; the first stage aging heat treatment temperature is 85°C, the holding time is 3 hours, then the temperature is raised to 125°C for the second stage aging heat treatment, the holding time is 11 hours, and the aluminum alloy wire is obtained by cooling at room temperature.

[0259] Experimental Example 1

[0260] The present application conducted performance tests on the high-strength and high-conductivity aluminum alloy wires provided in Examples 1-17 and the aluminum alloy wires provided in Comparative Examples 1-9. The tensile strength in the performance tests was tested in accordance with GB / T 228.1-2010, while the conductivity in the performance tests was tested in accordance with GB / T 12966-2008. The performance test results are shown in Table 1.

[0261] Table 1: Tensile strength and conductivity test results

[0262]

[0263] It can be seen from the test results shown in Table 1 that, compared with Comparative Examples 1-3, the aluminum alloy wire provided in Example 1 has improved tensile strength and electrical conductivity due to the simultaneous introduction of Be, Ni, and Ca.

[0264] Further comparison of Comparative Examples 4-6 and Example 1 shows that the aluminum alloy wire provided in Example 1 has improved tensile strength and electrical conductivity at the same time due to the three-stage solid solution heat treatment with increasing temperature. This indicates that the first two solid solution heat treatments in the multi-stage solid solution heat treatment with increasing temperature dissolve the coarse second phase in the aluminum alloy microstructure and improve the supersaturation of solute atoms. The third solid solution heat treatment in the multi-stage solid solution heat treatment further promotes the increase in the solid solubility of Mg and Si atoms, resulting in the presence of more Mg and Si atoms, and the precipitation of Mg2Si phase formed by Mg and Si atoms increases, thereby enhancing the alloy performance of the aluminum alloy. This enhances the tensile strength, electrical conductivity and other properties of the aluminum alloy wire.

[0265] Comparing Comparative Examples 7-9 with Example 1, it can be seen that the aluminum alloy wire provided in Example 1 has improved tensile strength and electrical conductivity simultaneously due to the three-stage failure heat treatment with increasing temperature. This indicates that the first two aging heat treatments in the multi-stage aging heat treatment with increasing temperature lead to the formation of aging clusters and heterogeneous nucleation sites of the β" phase, while the third aging heat treatment in the multi-stage solution heat treatment promotes the further formation of a large number of precipitated phases from the aging clusters and heterogeneous nucleation sites of the β" phase. This enhances the tensile strength, electrical conductivity and other properties of the aluminum alloy wire.

[0266] By comparing Example 1 with Examples 6-11, it can be seen that by optimizing the temperature of the three-stage solid solution heat treatment and the temperature of the three-stage aging heat treatment, the tensile strength, electrical conductivity and other properties of the aluminum alloy wire can be further improved.

[0267] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing a high-strength and high-conductivity aluminum alloy wire, characterized in that: Including steps: Step S1, sequentially smelting an aluminum ingot, a magnesium ingot, an Al-Si master alloy, an Al-Be master alloy, an Al-Ni master alloy, and an Al-Ca master alloy, performing AlB3 boronization treatment, refining, continuous casting, and continuous rolling to obtain an aluminum alloy rod; Step S2, subjecting the aluminum alloy rod to multi-stage solution heat treatment with increasing temperature and quenching at room temperature to obtain a heat-treated aluminum alloy rod; Step S3, subjecting the heat-treated aluminum alloy rod to a multi-pass drawing process to obtain an aluminum alloy wire; Step S4, subjecting the aluminum alloy wire to a multi-stage aging heat treatment with increasing temperature, and cooling the wire to room temperature to obtain a high-strength and high-conductivity aluminum alloy wire; The multi-stage solution heat treatment with increasing temperature is specifically: solution heat treatment at 485-495°C for 40-50 minutes, solution heat treatment at 515-525°C for 30-40 minutes, and solution heat treatment at 530-540°C for 20-30 minutes. The multi-stage aging heat treatment with increasing temperature is specifically: aging treatment at 80-90°C for 2-4 hours, aging treatment at 100-130°C for 10-12 hours, and aging treatment at 165-175°C for 6-8 hours; The high-strength and high-conductivity aluminum alloy wire comprises: Al: 97.90~98.50wt%, Mg: 0.60~0.80wt%, Si: 0.55~0.70wt%, Be: 0.10~0.16wt%, Ni: 0.15~0.24wt%, Ca: 0.05~0.08wt%, B: 0.01~0.10wt%.

2. The method for preparing a high-strength and high-conductivity aluminum alloy wire according to claim 1, characterized in that: In step S3, the multi-pass drawing process is specifically as follows: after 7-9 passes of drawing, the deformation of each drawing pass is 10% to 12%, and the drawing rate is 12 to 15 m / s.

3. The method for preparing a high-strength and high-conductivity aluminum alloy wire according to claim 1, characterized in that: In step S1, the boronization treatment is specifically as follows: adding AlB3 and performing boronization treatment at 710-760°C for 20-40 minutes; The refining specifically comprises: introducing argon gas and then sequentially adding a refining agent and a covering agent for refining; The continuous casting and rolling specifically includes: sequentially using a continuous casting mold and a continuous rolling mill to perform continuous casting and rolling.

4. Use of a high-strength and high-conductivity aluminum alloy wire prepared by the preparation method according to any one of claims 1 to 3 in wires and cables.

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