A method for preparing high-strength, high-conductivity and high-toughness ultrafine aluminum-magnesium-silicon alloy wire

Abstract

The present application relates to the field of aluminum alloy wire research, in particular to a kind of high-strength high-conductivity high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method.First, through smelting and continuous casting and rolling, the diameter of 8.0-10.0mm aluminum-magnesium-silicon alloy rod is obtained;Then, the diameter of 1.5-2.2mm aluminum-magnesium-silicon alloy wire is obtained by once drawing;Aluminum-magnesium-silicon alloy wire is subjected to high-temperature heat treatment and aging heat treatment, high-temperature heat treatment temperature is 480-530℃, holding time is 1-6 hours, aging heat treatment temperature is 150-190℃, holding time is 10-48 hours;After aging, the aluminum-magnesium-silicon alloy wire is subjected to secondary drawing, and the preparation of ultra-fine aluminum-magnesium-silicon alloy electronic wire is completed.The ultra-fine aluminum-magnesium-silicon alloy electronic wire prepared by the present application has high strength, high conductivity and high toughness, and is applied to charging pile and new energy vehicle connecting wire, which significantly improves the service life and reduces the power loss of connecting wire.

Description

TECHNICAL FIELD

[0001] The application relates to the field of aluminum alloy wire research, and particularly relates to a preparation method of high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire. BACKGROUND

[0002] New energy vehicles are an important part of the new energy industry and are an important strategic emerging industry in China. In the past five years, the sales of new energy vehicles in China have also increased steadily year by year. The increase in the holding amount of new energy vehicles also puts forward higher demand for the number of charging piles. The requirement of "building charging piles to promote the construction of new energy vehicles" is expected to reach a peak in the construction of charging piles for new energy vehicles in the next 10 years.

[0003] Cables are key components connecting charging piles and new energy vehicles, and cables are required to have good strength, elongation and conductivity performance matching. Since the 6xxx series aluminum alloy (aluminum-magnesium-silicon alloy) has good mechanical properties and electrical properties, and is low in cost, the aluminum-magnesium-silicon alloy electronic wire is widely used in new energy vehicle charging cables. Therefore, the increase in the sales of new energy vehicles and the promotion of the construction of charging piles will further expand the demand for aluminum-magnesium-silicon alloy electronic wires. Therefore, the future market prospect of aluminum-magnesium-silicon alloy wires for new energy vehicles is very broad.

[0004] The strength, elongation and conductivity of the aluminum-magnesium-silicon alloy are closely related to the alloy element content, element distribution state and microstructure state. Artificial aging treatment is a common means to control the strength and conductivity of the aluminum-magnesium-silicon alloy. Through aging treatment, the solid-solved Mg and Si atoms are precipitated in the form of second phase, which can not only play a role in precipitated phase strengthening, but also reduce the lattice distortion of the matrix, thereby improving the conductivity. Therefore, the aging treatment can simultaneously improve the strength and elongation of the aluminum-magnesium-silicon alloy. At the same aging temperature, with the extension of the aging time, the conductivity of the aluminum-magnesium-silicon alloy gradually increases, the strength first increases and then decreases, and the elongation first decreases and then increases. Therefore, it is difficult to simultaneously improve the strength, elongation and conductivity by controlling only the alloy elements. Therefore, the comprehensive control of the microstructure and alloy elements is the key to realizing the strength, elongation and conductivity of the aluminum-magnesium-silicon alloy, but there is still a lack of corresponding theoretical guidance to design and prepare aluminum-magnesium-silicon alloy wires with high strength, high conductivity and high toughness. SUMMARY

[0005] According to the urgent demand of new energy vehicle charging pile on high-strength, high-conductivity and high-toughness aluminum alloy electronic wire, the purpose of the present application is to provide a high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, which proposes a comprehensive design idea of dislocation, grain and precipitated phase, and develops a corresponding preparation process, and through melting, continuous casting and rolling, primary drawing, high-temperature heat treatment, aging heat treatment and secondary drawing, a diameter of 0.3mm high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy electronic wire is obtained.

[0006] The technical scheme adopted by the present application is as follows:

[0007] A high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, which comprises: melting, continuous casting and rolling, primary drawing, high-temperature heat treatment, aging heat treatment and secondary drawing, to obtain a diameter of 0.18-0.32mm ultra-fine aluminum-magnesium-silicon alloy wire; wherein the high-temperature heat treatment temperature is 480-530℃, and the holding time is 1-6 hours; the aging heat treatment temperature is 150-190℃, and the holding time is 10-48 hours.

[0008] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, in terms of weight percentage, the chemical composition and content of aluminum-magnesium-silicon alloy are as follows: Mg 0.25%-0.45%, Si 0.12%-0.22%, Fe 0.08%-0.12%, Mn 0.001%-0.003%, Zn 0.01%-0.02%, La 0.08%-0.15%, Ce 0.12%-0.25%, B 0.01%-0.025%, Cu<0.005%, Cr<0.005%, and Al is the balance.

[0009] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the melting process is as follows: industrial pure aluminum ingot with a purity of 99.6wt.% is added to a vacuum induction melting furnace, heated to 720-770℃, after the aluminum ingot is completely melted, Mg, KBF4, Al-Si intermediate alloy and La-Ce mixed rare earth are added in turn, stirred for 30-60 minutes, and a molten aluminum-magnesium-silicon alloy liquid is obtained.

[0010] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the continuous casting and rolling process is as follows: the aluminum-magnesium-silicon alloy liquid enters the crystallization wheel type casting machine, the casting temperature is 670-730℃, the casting blank after casting enters the three-roll rolling mill, the entering temperature of the rolling mill is 480-520℃, the temperature after rolling is 430-460℃, and then water cooling to room temperature is carried out, and the diameter of the aluminum alloy rod obtained by rolling is 8.0-10.0mm.

[0011] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the cooling mode of the aluminum alloy rod after rolling is water cooling.

[0012] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the first drawing is cold drawing of the aluminum-magnesium-silicon alloy rod, and a water-soluble cooling liquid is used in the first drawing to ensure that the drawing process is cold drawing, and the diameter of the aluminum-magnesium-silicon alloy wire obtained by drawing is 1.5-2.2 mm.

[0013] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the second drawing is cold drawing of the aluminum-magnesium-silicon alloy wire, and a water-soluble cooling liquid is used in the second drawing to ensure that the drawing process is cold drawing, and the diameter of the ultra-fine aluminum-magnesium-silicon alloy wire obtained by drawing is 0.18-0.32 mm, and the preparation of the high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire is completed.

[0014] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, the tensile strength of the ultra-fine aluminum-magnesium-silicon alloy wire is 220-240 MPa, the conductivity of the ultra-fine aluminum-magnesium-silicon alloy wire is 60-61 IACS%, and the elongation of the ultra-fine aluminum-magnesium-silicon alloy wire is 10-11%.

[0015] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, after high-temperature heat treatment, cooling to room temperature, the cooling mode is water cooling.

[0016] The high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire preparation method, after high-temperature heat treatment, cooling to room temperature, the cooling mode is water cooling.

[0017] The design principle and beneficial effects of the present application are as follows:

[0018] 1. Organization design and process control, the present application is based on the influence mechanism of dislocation, grain and precipitate on strength, conductivity and elongation, and the good matching of strength, conductivity and elongation of ultra-fine aluminum-magnesium-silicon alloy wire is realized by synergistic regulation of dislocation, grain and precipitate. Next, the regulation principle and process of dislocation, grain and precipitate of the present application will be described.

[0019] 1) Dislocation design and process control: a large number of dislocations can be accumulated in the drawn aluminum-magnesium-silicon alloy wire, causing dislocation strengthening and improving the strength of the aluminum-magnesium-silicon alloy wire; in addition, compared with solid solution atoms and precipitated phases, the influence of dislocations on electrical conductivity can be ignored. Therefore, introducing dislocations into the aluminum-magnesium-silicon alloy wire can significantly improve the strength, with a small loss of electrical conductivity and elongation, but the preparation process of the traditional aluminum-magnesium-silicon alloy wire is to perform aging treatment on the drawn aluminum-magnesium-silicon alloy wire, which will cause the recovery of dislocations and the loss of dislocation strengthening. Therefore, the present application performs artificial aging treatment before secondary drawing, so that a large number of dislocations can be stored in the aluminum-magnesium-silicon alloy wire after secondary drawing, thereby improving the strength of the aluminum-magnesium-silicon alloy wire.

[0020] 2) Grain design and process control: the grain size of the aluminum-magnesium-silicon alloy wire is reduced, the strength is increased, but the elongation and electrical conductivity are decreased, in order to meet the requirement of elongation, it is necessary to avoid serious refinement of the grain size in the aluminum-magnesium-silicon alloy wire. Therefore, the present application performs high-temperature full annealing on the aluminum-magnesium-silicon alloy wire after primary drawing before secondary drawing, so that complete recrystallization of the grains in the aluminum-magnesium-silicon alloy wire occurs. Therefore, the grain size of the completely recrystallized aluminum-magnesium-silicon alloy wire can be maintained at a relatively large level after secondary drawing. In addition, the <111> fiber texture of hard orientation can be formed in the aluminum-magnesium-silicon alloy wire after secondary drawing, which further improves the strength of the aluminum-magnesium-silicon alloy wire without affecting the electrical conductivity and elongation.

[0021] 3) Precipitated phase design and process control: when the aging temperature is unchanged, with the extension of the aging time, the strength of the aluminum-magnesium-silicon alloy wire first increases and then decreases, the elongation first decreases and then increases, and the electrical conductivity continuously increases. The essence of the above performance evolution law is the continuous precipitation of solid solution atoms and the continuous growth of precipitated phases. The precipitation of solid solution atoms and the growth of precipitated phases have different influences on the strength, elongation and electrical conductivity, and the influence on the electrical conductivity is particularly serious. Therefore, prolonging the aging time can significantly improve the electrical conductivity. The above regulation of dislocations and grains has improved the strength and elongation of the aluminum-magnesium-silicon alloy wire. Therefore, the regulation of precipitated phases mainly focuses on the regulation of electrical conductivity. The present application adopts overaging treatment, that is, a long time of aging treatment is performed to ensure that the aluminum-magnesium-silicon alloy wire has high electrical conductivity.

[0022] In summary, through the processes of high-temperature heat treatment, artificial overaging and secondary drawing, the present application can realize the synergistic regulation of dislocations, grain size, grain orientation and precipitated phases in the aluminum-magnesium-silicon alloy wire, and realize the good matching of the strength, electrical conductivity and elongation of the aluminum-magnesium-silicon alloy wire.

[0023] 2、Beneficial effects: The present application can realize the regulation of the strength, electrical conductivity and elongation of the aluminum-magnesium-silicon alloy wire by designing the high-temperature heat treatment, artificial aging treatment and secondary drawing process in the preparation process of the ultra-fine aluminum-magnesium-silicon alloy wire, and preparing the ultra-fine aluminum-magnesium-silicon alloy wire with high strength, high conductivity and high toughness. The ultra-fine aluminum-magnesium-silicon alloy electronic wire prepared by the present application will be applied to the charging pile connecting wire of new energy vehicles in the future, which can significantly improve the service safety and energy saving characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The present application is an ultra-fine aluminum-magnesium-silicon alloy wire preparation process flow chart. DETAILED DESCRIPTION

[0025] In the specific implementation process, the present application first obtains an aluminum-magnesium-silicon alloy rod with a diameter of 8.0-10.0mm by melting and continuous casting and rolling; then obtains an aluminum-magnesium-silicon alloy wire with a diameter of 1.5-2.2mm by primary drawing; performs high-temperature heat treatment and aging heat treatment on the aluminum-magnesium-silicon alloy wire, the high-temperature heat treatment temperature is 480-530℃, the holding time is 1-6 hours, the aging heat treatment temperature is 150-190℃, and the holding time is 10-48 hours; and performs secondary drawing on the aged aluminum-magnesium-silicon alloy wire to complete the preparation of the ultra-fine aluminum-magnesium-silicon alloy electronic wire.

[0026] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other examples improved or polished by those skilled in the art belong to the scope of protection of the present application. It should be understood that the embodiments of the present application are only used to illustrate the technical effects of the present application, not to limit the protection scope of the present application. In the embodiments, the methods used are conventional methods unless otherwise specified.

[0027] Embodiment 1

[0028] As shown in Figure 1 Embodiment 1 of the present application proposes a preparation method of ultra-fine aluminum-magnesium-silicon alloy wire with high strength, high conductivity and high toughness, and the process flow chart includes: melting → continuous casting and rolling → primary drawing → high-temperature heat treatment → aging heat treatment → secondary drawing.

[0029] Step 1: smelting, industrial pure aluminum ingot with purity of 99.6wt.% is added into a vacuum induction smelting furnace, heated to 750℃, after the aluminum ingot is completely melted, Mg, KBF4, Al-Si intermediate alloy and La-Ce mixed rare earth are added in turn, stirring for 30 minutes, obtaining molten aluminum-magnesium-silicon alloy liquid, the specific composition is as follows (wt.%): Mg 0.35, Si 0.16, Fe 0.09, Mn 0.003, Zn 0.02, La 0.1, Ce 0.15, B 0.015, Cu 0.0038, Cr 0.0041, Al balance;

[0030] Step 2: continuous casting and rolling, the aluminum-magnesium-silicon alloy liquid enters the crystallization wheel type casting machine, the casting temperature is 710℃, the cast blank after casting enters the three-roll rolling mill, the entering temperature of the rolling mill is 495℃, the temperature after rolling is 450℃, then water cooling is carried out, and the temperature is cooled to room temperature, the aluminum alloy rod with a diameter of 9.5mm is obtained by rolling;

[0031] Step 3: primary drawing, the aluminum-magnesium-silicon alloy rod is drawn, a conventional water-soluble cooling liquid (such as: main components are mineral oil, emulsifier, antirust agent, stabilizer and water) is used during drawing, cold drawing can be ensured during drawing, the drawing pass is 16, the diameter reduction process is 9.0mm→8.0mm→7.0mm→6.2mm→5.5mm→5.0mm→4.4mm→3.9mm→3.5mm→3.25mm→3.0mm→2.65mm→2.32mm→2.1mm→1.95mm→1.7mm, the wire drawing speed is 40m / min, and the aluminum wire with a diameter of 1.7mm is obtained by drawing;

[0032] Step 4: high temperature heat treatment, the aluminum-magnesium-silicon alloy wire with a diameter of 1.7mm is subjected to high temperature heat treatment, the temperature is 495℃, the holding time is 4 hours, and the temperature is cooled to room temperature by water cooling;

[0033] Step 5: aging heat treatment, the aluminum-magnesium-silicon alloy wire after high temperature heat treatment is subjected to artificial aging treatment, the temperature is 170℃, the holding time is 24 hours, and the temperature is cooled to room temperature in air;

[0034] Step 6: Secondary drawing, the aged aluminum-magnesium-silicon alloy wire was drawn, the cooling liquid was conventional water-soluble cooling liquid (such as: the main components were mineral oil, emulsifier, anti-rust agent, stabilizer and water), the drawing process was cold drawing, the drawing pass was 28, the diameter reduction process was 1.6 mm→1.5 mm→1.42 mm→1.32 mm→1.24 mm→1.16 mm→1.12 mm→1.08 mm→1.04 mm→1.0 mm→0.95 mm→0.91 mm→0.86 mm→0.82 mm→0.78 mm→0.74 mm→0.70 mm→0.66 mm→0.63 mm→0.6 mm→0.56 mm→0.52 mm→0.48 mm→0.44 mm→0.40 mm→0.36 mm→0.32 mm→0.3 mm, the wire drawing speed was 50 m / min, and the ultra-fine aluminum-magnesium-silicon alloy wire with a diameter of 0.3 mm was obtained.

[0035] Comparative Example 1

[0036] The aluminum-magnesium-silicon alloy wire preparation process of Comparative Example 1 was as follows: Step 1 of Example 1; Step 2 of Example 1; Step 3 of Example 1; Step 4 of Example 1; the high-temperature heat-treated aluminum-magnesium-silicon alloy wire obtained in Step 4 was artificially aged at a temperature of 170 ℃ for 4 hours, and then air-cooled to room temperature; Step 6 of Example 1.

[0037] Comparative Example 2

[0038] The aluminum-magnesium-silicon alloy wire preparation process of Comparative Example 2 was as follows: Step 1 of Example 1; Step 2 of Example 1; Step 3 of Example 1; Step 4 of Example 1; Step 6 of Example 1; Step 5 of Example 1.

[0039] Comparative Example 3

[0040] The aluminum-magnesium-silicon alloy wire preparation process of Comparative Example 3 was as follows: Step 1 of Example 1; Step 2 of Example 1; Step 3 of Example 1; Step 4 of Example 1; Step 6 of Example 1; the aluminum-magnesium-silicon alloy wire obtained by secondary drawing was artificially aged at a temperature of 170 ℃ for 4 hours, and then air-cooled to room temperature.

[0041] Comparative Example 4

[0042] The aluminum-magnesium-silicon alloy wire preparation process of Comparative Example 4 was as follows: Step 1 of Example 1; Step 2 of Example 1; Step 3 of Example 1; Step 5 of Example 1; secondary drawing, the aged aluminum-magnesium-silicon alloy wire was drawn, the cooling liquid was water-soluble cooling liquid, when the aluminum-magnesium-silicon alloy wire was drawn to a diameter of 1.6 mm, the wire breaking phenomenon occurred, and the aluminum-magnesium-silicon alloy wire could not be continuously drawn.

[0043] Table 1 Macroscopic wire diameter and performance comparison results of aluminum-magnesium-silicon alloy wires prepared in Example 1 and Comparative Examples 1-4

[0044] Sample Aluminium-magnesium-silicon alloy wire diameter Tensile strength / MPa Electrical conductivity / IACS % Elongation / % Example 1 0.3 mm 235.6 60.5 10.5 Comparative Example 1 0.3 mm 230.7 58.4 9.5 Comparative Example 2 0.3 mm 198.5 60.7 10.3 Comparative Example 3 0.3 mm 200.3 58.6 9.8 Comparative Example 4 1.6 mm 273.3 57.6 2.1

[0045] As can be seen from Table 1, compared with Comparative Example 1, the aluminum-magnesium-silicon alloy wire prepared in Example 1 has better performance, especially obvious advantages in electrical conductivity, indicating that compared with under-aging process, over-aging treatment can significantly purify the matrix and improve the electrical conductivity of the aluminum-magnesium-silicon alloy wire; compared with Comparative Example 2, Example 1 has higher tensile strength under the condition of similar electrical conductivity and elongation, indicating that the process of first over-aging treatment and then secondary drawing can retain one-dimensional dislocation defects, while the process of first secondary drawing and then over-aging treatment will lead to dislocation recovery and loss of certain strength; compared with Comparative Example 3, the strength, electrical conductivity and elongation of the ultra-fine aluminum-magnesium-silicon alloy wire prepared in Example 1 are all better than those of Comparative Example 3, indicating that the process of first over-aging and then secondary drawing can obtain better matching of strength, electrical conductivity and elongation performance; compared with Comparative Example 4, the diameter of the aluminum-magnesium-silicon alloy wire prepared in Example 1 is 0.3 mm, while the diameter of the aluminum-magnesium-silicon alloy wire prepared in Comparative Example 4 is 1.6 mm, indicating that if high-temperature heat treatment is not performed, after one-time drawing, directly performing over-aging and secondary drawing treatment will lead to serious lack of plastic deformation capacity of the aluminum-magnesium-silicon alloy wire during secondary drawing, thereby causing the secondary drawing to be unable to continue, and finally unable to prepare ultra-fine aluminum-magnesium-silicon alloy wire. In addition, although the strength of the aluminum-magnesium-silicon alloy wire prepared in Comparative Example 4 is higher than that of the aluminum-magnesium-silicon alloy wire prepared in Example 1, the electrical conductivity and elongation are lower, especially the elongation decreases significantly. In summary, through the process of one-time drawing, high-temperature heat treatment, over-aging treatment and secondary drawing treatment, the ultra-fine aluminum-magnesium-silicon alloy wire with the best comprehensive performance of strength, electrical conductivity and elongation can be prepared.

[0046] The implementation results show that the ultra-fine aluminum-magnesium-silicon alloy electronic wire prepared by the present application has high strength, high conductivity and high toughness characteristics, and can be applied to charging piles and new energy vehicle connecting wires in the future, which can significantly improve the service life and reduce the electrical energy loss of the connecting wire.

Claims

1. A method for preparing high-strength, high-conductivity, and high-toughness ultrafine aluminum-magnesium-silicon alloy wire, characterized in that, The method comprises the following steps in sequence: smelting, continuous casting and rolling, primary drawing, high-temperature heat treatment, aging heat treatment, secondary drawing, and obtaining the ultra-fine aluminum-magnesium-silicon alloy wire with a diameter of 0.18-0.32 mm; (1) The smelting process is as follows: the industrial pure aluminum ingot with a purity of 99.6wt.% is added into a vacuum induction smelting furnace, and heated to 720-770℃, after the aluminum ingot is completely melted, Mg, KBF4, Al-Si intermediate alloy and La-Ce mixed rare earth are sequentially added, and stirred for 30-60 minutes to obtain the molten aluminum-magnesium-silicon alloy liquid; the chemical composition and content of the aluminum-magnesium-silicon alloy are as follows: Mg 0.25%-0.45%, Si 0.12%-0.22%, Fe 0.08%-0.12%, Mn 0.001%-0.003%, Zn 0.01%-0.02%, La 0.08%-0.15%, Ce 0.12%-0.25%, B 0.01%-0.025%, Cu<0.005%, Cr<0.005%, and Al is the balance; (2) The continuous casting and rolling process is as follows: the aluminum-magnesium-silicon alloy liquid enters a crystallization wheel type casting machine, the casting temperature is 670-730℃, the cast blank after casting enters a three-roll rolling mill for continuous rolling, the entering temperature of the rolling mill is 480-520℃, the temperature after rolling is 430-460℃, and then water cooling is carried out to room temperature, and the aluminum alloy rod with a diameter of 8.0-10.0 mm is obtained by rolling; (3) The primary drawing is cold drawing of the aluminum-magnesium-silicon alloy rod, water-soluble cooling liquid is used in the primary drawing to ensure that the drawing process is cold drawing, and the aluminum-magnesium-silicon alloy wire with a diameter of 1.5-2.2 mm is obtained by drawing; (4) The high-temperature heat treatment temperature is 480-530℃, and the holding time is 1-6 hours; (5) The aging heat treatment temperature is 150-190℃, and the holding time is 10-48 hours; (6) The secondary drawing is cold drawing of the aluminum-magnesium-silicon alloy wire, water-soluble cooling liquid is used in the secondary drawing to ensure that the drawing process is cold drawing, and the ultra-fine aluminum-magnesium-silicon alloy wire with a diameter of 0.18-0.32 mm is obtained by drawing, and the preparation of the high-strength, high-conductivity and high-toughness ultra-fine aluminum-magnesium-silicon alloy wire is completed; Before the secondary drawing, the aluminum-magnesium-silicon alloy wire after the primary drawing is fully annealed at high temperature, so that the grains in the aluminum-magnesium-silicon alloy wire completely recrystallize, the hard-oriented <111> filament texture along the axial direction is formed in the aluminum-magnesium-silicon alloy wire after the secondary drawing, the strength of the aluminum-magnesium-silicon alloy wire is further improved, and the conductivity and elongation are not damaged; the tensile strength of the ultra-fine aluminum-magnesium-silicon alloy wire is 220-240 MPa, the conductivity of the ultra-fine aluminum-magnesium-silicon alloy wire is 60-61 IACS%, and the elongation of the ultra-fine aluminum-magnesium-silicon alloy wire is 10-11%.

2. The method for preparing high-strength, high-conductivity, and high-toughness ultrafine aluminum-magnesium-silicon alloy wire according to claim 1, characterized in that, The cooling mode of the aluminum alloy rod after rolling is water cooling.

3. The method for preparing high-strength, high-conductivity, and high-toughness ultrafine aluminum-magnesium-silicon alloy wire according to claim 1, characterized in that, The cooling mode after high-temperature heat treatment is water cooling.

4. The method for preparing high-strength, high-conductivity, and high-toughness ultrafine aluminum-magnesium-silicon alloy wire according to claim 1, characterized in that, The cooling mode after aging heat treatment is air cooling.

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