Aluminum alloy wire and method of making same

Abstract

The application relates to the alloy technical field and particularly relates to an aluminum alloy wire rod and a manufacturing method thereof. The wire rod comprises a pure aluminum sleeve and an aluminum alloy inner core. The pure aluminum sleeve is wrapped outside the aluminum alloy inner core. The pure aluminum sleeve and the aluminum alloy inner core are in interference fit. The aluminum alloy inner core is made of aluminum alloy. The chemical composition of the aluminum alloy is as follows: Si: 0.4%-0.7%, Mg: 0.4%-0.8%, Sr: 0.03%-0.1%, Zr: 0.25%-0.35%, Nb: 0.1%-0.3%, Mn: 0.05%-0.1%, B: 0.01%-0.063%, and the balance is Al. The method comprises the following steps: weighing raw materials, melting, standing and heat preservation, high-energy ultrasonic treatment, rheological forming, bar making, cutting, manufacturing a pure aluminum sleeve, centering compression, hot extrusion, double-stage solid solution treatment and double-stage aging treatment. The aluminum alloy sleeve and the aluminum alloy inner core are in interference fit, and the double-stage solid solution treatment and the double-stage aging treatment are adopted, so that the alloy elements on both sides of the interface are in concentration gradient diffusion, a component gradient structure is obtained, and the aluminum alloy wire rod has the advantages of high conductivity, corrosion resistance and high strength.

Description

Technical Field

[0001] The present invention relates to the technical field of alloys. Background Art

[0002] Aluminum wire is generally used in the field of overhead conductors. Under such extremely complex working conditions, it needs to have sufficient strength and electrical conductivity. The aluminum alloy used as overhead conductors in the existing technology contains Si and Zr elements. However, the impurities in the alloys added with Si in the existing technology have a significant impact on the electrical conductivity. Boron treatment is used in the existing technology to reduce impurities in the alloy conductors, but its electrical conductivity is relatively low and cannot meet the complex working conditions of overhead conductors. In addition, the transition metals in the existing technology have little effect on the electrical conductivity while improving the mechanical properties. Therefore, the aluminum alloy wire suitable for overhead conductors cannot have both mechanical properties and electrical conductivity. Summary of the Invention

[0003] In order to solve the technical problem in the prior art that aluminum alloy wires cannot have both mechanical properties and electrical conductivity when used as conductors, the present invention provides an aluminum alloy wire and a method for manufacturing the same.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: an aluminum alloy wire, including a pure aluminum sleeve and an aluminum alloy inner core, the pure aluminum sleeve and the aluminum alloy inner core are interference fit, the pure aluminum sleeve is wrapped around the aluminum alloy inner core, and the aluminum alloy inner core is made of aluminum alloy, and the chemical composition of the aluminum alloy is: Si: 0.4%-0.7%, Mg: 0.4%-0.8%, Sr: 0.03%-0.1%, Zr: 0.25%-0.35%, Nb: 0.1%-0.3%, Mn: 0.05%-0.1%, B: 0.01%-0.063%, and the balance is Al.

[0005] A method for producing an aluminum alloy wire comprises the following steps:

[0006] S1: Preparation of aluminum alloy inner core:

[0007] S101: Weigh pure Si powder, metal Mg, metal Sr, metal Zr, metal Nb, metal Mn, metal Al, and pure B powder, wherein the mass of pure Si powder accounts for 0.4%-0.7% of the total raw material mass, the mass of metal Mg accounts for 0.4%-0.8% of the total raw material mass, the mass of metal Sr accounts for 0.03%-0.1% of the total raw material mass, the mass of metal Zr accounts for 0.25%-0.35% of the total raw material mass, the mass of metal Nb accounts for 0.1%-0.3% of the total raw material mass, the mass of metal Mn accounts for 0.05%-0.1% of the total raw material mass, the mass of pure B powder accounts for 0.01%-0.063% of the total raw material mass, and the remaining raw material is metal Al;

[0008] S102: placing metal Al into an alumina crucible in a vacuum induction melting furnace, evacuating the furnace and filling it with argon, starting the vacuum induction melting furnace, completely melting the metal Al, then adding metal Zr and metal Nb to the alumina crucible and heating them until completely melted, then adding pure Si powder and metal Mn to the alumina crucible and heating them until completely melted, then adding pure B powder to the alumina crucible and heating them until completely melted, then adding metal Mg and metal Sr to the alumina crucible and heating them until completely melted, and then stirring to obtain a melt;

[0009] S103: Cooling the melt to the pouring temperature and keeping it still;

[0010] S104: Under an argon atmosphere, the melt is subjected to high-energy ultrasonic treatment using an ultrasonic device;

[0011] S105: Using semi-solid rheology forming process to make the melt into alloy rods;

[0012] S106: turning the alloy rod into a core rod shape to obtain an aluminum alloy inner core;

[0013] S2: Take another piece of metal Al with a volume 1.5 times that of the aluminum alloy inner core, and process the metal Al into a sleeve to obtain a pure aluminum sleeve;

[0014] S3: Using a universal material testing machine, the pure aluminum sleeve and the aluminum alloy inner core are aligned and compressed to obtain an aluminum alloy ingot with a gradient structure;

[0015] S4: feeding the aluminum alloy ingot into an extruder for hot extrusion to obtain a gradient structure aluminum alloy wire;

[0016] S5: performing a double-stage solid solution treatment and a double-stage aging treatment on the gradient structure aluminum alloy wire to obtain a final aluminum alloy wire.

[0017] A method for producing aluminum alloy wire, wherein the step S102 is to evacuate and fill with argon until the pressure in the vacuum induction melting furnace reaches 2×10 4 Pa, the stirring speed is 100-150 rpm, and the stirring time is 1-2 hours.

[0018] Preferably, the pouring temperature in step S103 is 700-750° C., and the standing and heat-insulating time is 20-30 minutes.

[0019] Preferably, the power of the high-energy ultrasonic treatment in step S104 is 1100W-1500W, and the treatment time is 30-60 minutes.

[0020] Preferably, the semi-solid rheological forming process in step S105 is implemented by a continuous rheological extruder, the rotation speed of the extrusion wheel in the continuous rheological extruder is 7.5 m / min, and the flow rate of cooling water in the continuous rheological extruder is 14 L / min.

[0021] Preferably, the temperature of the hot extrusion in step S4 is 400° C., the extrusion speed is 1 mm / s, and the diameter of the obtained gradient structure aluminum alloy wire is 10 mm.

[0022] Preferably, in the double-stage solution treatment in step S5, the temperature of the first-stage solution treatment is 445° C.-455° C., and the time is 1 hour, and the temperature of the second-stage solution treatment is 485° C.-495° C., and the time is 0-1 hour.

[0023] Preferably, in the double-stage aging treatment in step S5, the first stage aging treatment is performed at a temperature of 115° C.-125° C. for 4 hours, and the second stage aging treatment is performed at a temperature of 170° C.-180° C. for 1-3 hours.

[0024] Compared with the prior art, the present invention has the beneficial effect that the aluminum alloy wire comprises a pure aluminum sleeve and an aluminum alloy inner core, the aluminum alloy sleeve and the aluminum alloy inner core adopt an interference fit, and adopt a two-stage solid solution and two-stage aging heat treatment process, so that the alloy elements on both sides of the interface diffuse in a concentration gradient, obtaining a composition gradient structure, so that the aluminum alloy wire has the advantages of high conductivity, corrosion resistance and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Graph showing the tensile strength, elongation, and yield strength test results of the aluminum alloy wires prepared in Comparative Examples 1-6 of the present invention.

[0026] Figure 2 Graph showing the tensile strength, elongation, and yield strength test results of the aluminum alloy wires prepared in Comparative Examples 7-10 and Example 3 of the present invention.

[0027] Figure 3 1 is a graph showing the tensile strength and elongation test results of the aluminum alloy wires prepared in Comparative Examples 7-10 and Example 3 of the present invention.

[0028] Figure 4 1 is a graph showing the electrical conductivity test results of the aluminum alloy wires prepared in Comparative Examples 7-10 and Example 3 of the present invention. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is as follows:

[0030] Example 1:

[0031] An aluminum alloy wire rod comprises a pure aluminum sleeve and an aluminum alloy inner core, the pure aluminum sleeve is wrapped outside the aluminum alloy inner core, the pure aluminum sleeve and the aluminum alloy inner core are in interference fit, the aluminum alloy inner core is made of an aluminum alloy, and the aluminum alloy has a chemical composition of Si: 0.4%, Mg: 0.4%, Sr: 0.03%, Zr: 0.25%, Nb: 0.3%, Mn: 0.1%, B: 0.063%, and the balance being Al;

[0032] A manufacturing method of an aluminum alloy wire rod comprises the following steps:

[0033] S1: preparing an aluminum alloy inner core;

[0034] S101: weighing pure Si powder, metal Mg, metal Sr, metal Zr, metal Nb, metal Mn, metal Al and pure B powder, wherein the mass of the pure Si powder accounts for 0.4% of the total raw material mass, the mass of the metal Mg accounts for 0.4% of the total raw material mass, the mass of the metal Sr accounts for 0.03% of the total raw material mass, the mass of the metal Zr accounts for 0.25% of the total raw material mass, the mass of the metal Nb accounts for 0.3% of the total raw material mass, the mass of the metal Mn accounts for 0.1% of the total raw material mass, the mass of the pure B powder accounts for 0.063% of the total raw material mass, and the rest of the raw material is metal Al; the total raw material in the step refers to the total raw material for preparing the aluminum alloy inner core;

[0035] S102: placing the metal Al into an alumina crucible in a vacuum induction melting furnace, vacuumizing and filling argon until the air pressure in the vacuum induction melting furnace reaches 2×10 4 Pa, starting the vacuum induction melting furnace, completely melting the metal Al, then adding the metal Zr and the metal Nb into the alumina crucible, heating until completely melted, then adding the pure Si powder and the metal Mn into the alumina crucible, heating until completely melted, then adding the pure B powder into the alumina crucible, heating until completely melted, then adding the metal Mg and the metal Sr into the alumina crucible, heating until completely melted, and then stirring at a stirring speed of 100 r / min for 1 hour to obtain a melt;

[0036] S103: cooling the melt to a pouring temperature, and standing for heat preservation, wherein the pouring temperature is 700℃, and the standing time for heat preservation is 20 minutes; S104: under an argon atmosphere, performing high-energy ultrasonic treatment on the melt by using an ultrasonic device, wherein the power of the high-energy ultrasonic treatment is 1100 W, and the treatment time is 30 minutes;

[0037] S105: preparing an alloy rod from the melt by using a semi-solid rheological forming process, wherein the semi-solid rheological forming process is realized by using a continuous rheological extruder, the rotating speed of an extrusion wheel in the continuous rheological extruder is 7.5 m / min, and the flow rate of cooling water in the continuous rheological extruder is 14 L / min;

[0038] S106: turning the alloy rod into a core rod shape to obtain an aluminum alloy inner core;

[0039] S2: Take another piece of metal Al with a volume 1.5 times that of the aluminum alloy inner core, and process the metal Al into a sleeve to obtain a pure aluminum sleeve;

[0040] S3: Using a universal material testing machine, the pure aluminum sleeve and the aluminum alloy inner core are aligned and then compressed to obtain a gradient structure aluminum alloy ingot; S4: The aluminum alloy ingot is fed into an extruder for hot extrusion at a temperature of 400°C and an extrusion speed of 1 mm / s to obtain a gradient structure aluminum alloy wire. The obtained gradient structure aluminum alloy wire has a diameter of 10 mm;

[0041] S5: The gradient structure aluminum alloy wire is subjected to a double-stage solution treatment and a double-stage aging treatment to obtain a final aluminum alloy wire. In the double-stage solution treatment, the temperature of the first stage solution treatment is 445°C, the time is 1 hour, and the temperature of the second stage solution treatment is 485°C, the time is 0.1 hour. In the double-stage aging treatment, the temperature of the first stage aging treatment is 115°C, the time is 4 hours, and the temperature of the second stage aging treatment is 170°C, the time is 1 hour.

[0042] Example 2:

[0043] An aluminum alloy wire comprises a pure aluminum sleeve and an aluminum alloy inner core. The pure aluminum sleeve is wrapped around the aluminum alloy inner core. The pure aluminum sleeve and the aluminum alloy inner core are interference fit. The aluminum alloy inner core is made of aluminum alloy. The chemical composition of the aluminum alloy is as follows: Si: 0.7%, Mg: 0.8%, Sr: 0.1%, Zr: 0.35%, Nb: 0.1%, Mn: 0.05%, B: 0.01%, and the balance is Al.

[0044] A method for producing an aluminum alloy wire comprises the following steps:

[0045] S1: Preparation of aluminum alloy inner core:

[0046] S101: Weigh pure Si powder, metal Mg, metal Sr, metal Zr, metal Nb, metal Mn, metal Al, and pure B powder, wherein the mass of pure Si powder accounts for 0.7% of the total raw material mass, the mass of metal Mg accounts for 0.8% of the total raw material mass, the mass of metal Sr accounts for 0.1% of the total raw material mass, the mass of metal Zr accounts for 0.35% of the total raw material mass, the mass of metal Nb accounts for 0.1% of the total raw material mass, the mass of metal Mn accounts for 0.05% of the total raw material mass, the mass of pure B powder accounts for 0.01% of the total raw material mass, and the remaining raw materials are metal Al; the total raw materials mentioned in this step refer to the total raw materials for preparing the aluminum alloy inner core

[0047] S102: Place the metal Al into an alumina crucible in a vacuum induction melting furnace, evacuate the furnace and fill it with argon until the pressure in the vacuum induction melting furnace reaches 2×10 4 Pa, start the vacuum induction melting furnace, completely melt metal Al, then add metal Zr and metal Nb to the alumina crucible, heat until completely melted, then add pure Si powder and metal Mn to the alumina crucible, heat until completely melted, then add pure B powder to the alumina crucible, heat until completely melted, then add metal Mg and metal Sr to the alumina crucible, heat until completely melted, and stir at a speed of 150 rpm for 2 hours to obtain a melt;

[0048] S103: Cooling the melt to a pouring temperature, standing and holding the melt at a temperature of 750° C. for 30 minutes; S104: Under an argon atmosphere, performing high-energy ultrasonic treatment on the melt using an ultrasonic device at a power of 1500 W for 60 minutes;

[0049] S105: The melt is formed into an alloy rod using a semi-solid rheological forming process. The semi-solid rheological forming process is implemented using a continuous rheological extruder. The rotation speed of the extrusion wheel in the continuous rheological extruder is 7.5 m / min, and the flow rate of cooling water in the continuous rheological extruder is 14 L / min.

[0050] S106: turning the alloy rod into a core rod shape to obtain an aluminum alloy inner core;

[0051] S2: Take another piece of metal Al with a volume 1.5 times that of the aluminum alloy inner core, and process the metal Al into a sleeve to obtain a pure aluminum sleeve;

[0052] S3: Using a universal material testing machine, the pure aluminum sleeve and the aluminum alloy inner core are aligned and then compressed to obtain a gradient structure aluminum alloy ingot; S4: The aluminum alloy ingot is fed into an extruder for hot extrusion at a temperature of 400°C and an extrusion speed of 1 mm / s to obtain a gradient structure aluminum alloy wire. The obtained gradient structure aluminum alloy wire has a diameter of 10 mm;

[0053] S5: The gradient structure aluminum alloy wire is subjected to a double-stage solution treatment and a double-stage aging treatment to obtain a final aluminum alloy wire. In the double-stage solution treatment, the temperature of the first stage solution treatment is 455°C and the time is 1 hour, and the temperature of the second stage solution treatment is 495°C and the time is 1 hour. In the double-stage aging treatment, the temperature of the first stage aging treatment is 125°C and the time is 4 hours, and the temperature of the second stage aging treatment is 180°C and the time is 2 hours.

[0054] Example 3:

[0055] An aluminum alloy wire comprises a pure aluminum sleeve and an aluminum alloy inner core. The pure aluminum sleeve is wrapped around the aluminum alloy inner core. The pure aluminum sleeve and the aluminum alloy inner core are interference fit. The aluminum alloy inner core is made of aluminum alloy. The chemical composition of the aluminum alloy is as follows: Si: 0.55%, Mg: 0.6%, Sr: 0.065%, Zr: 0.3%, Nb: 0.2%, Mn: 0.075%, B: 0.036%, and the balance is Al.

[0056] A method for producing an aluminum alloy wire comprises the following steps:

[0057] S1: Preparation of aluminum alloy inner core:

[0058] S101: Weigh pure Si powder, metal Mg, metal Sr, metal Zr, metal Nb, metal Mn, metal Al, and pure B powder, wherein the mass of pure Si powder accounts for 0.55% of the total raw material mass, the mass of metal Mg accounts for 0.6% of the total raw material mass, the mass of metal Sr accounts for 0.065% of the total raw material mass, the mass of metal Zr accounts for 0.3% of the total raw material mass, the mass of metal Nb accounts for 0.2% of the total raw material mass, the mass of metal Mn accounts for 0.075% of the total raw material mass, the mass of pure B powder accounts for 0.036% of the total raw material mass, and the remaining raw materials are metal Al; the total raw materials described in this step refer to the total raw materials for preparing the aluminum alloy inner core. S102: Put metal Al into an alumina crucible in a vacuum induction melting furnace, evacuate and fill with argon until the pressure in the vacuum induction melting furnace reaches 2×10 4 Pa, start the vacuum induction melting furnace, completely melt metal Al, then add metal Zr and metal Nb to the alumina crucible, heat until completely melted, then add pure Si powder and metal Mn to the alumina crucible, heat until completely melted, then add pure B powder to the alumina crucible, heat until completely melted, then add metal Mg and metal Sr to the alumina crucible, heat until completely melted, and stir at a speed of 125 rpm for 1.5 hours to obtain a melt;

[0059] S103: Cooling the melt to a pouring temperature and holding the melt at a temperature of 725° C. for 25 minutes; S104: Under an argon atmosphere, performing high-energy ultrasonic treatment on the melt using an ultrasonic device at a power of 1300 W for 45 minutes;

[0060] S105: The melt is formed into an alloy rod using a semi-solid rheological forming process. The semi-solid rheological forming process is implemented using a continuous rheological extruder. The rotation speed of the extrusion wheel in the continuous rheological extruder is 7.5 m / min, and the flow rate of cooling water in the continuous rheological extruder is 14 L / min.

[0061] S106: turning the alloy rod into a core rod shape to obtain an aluminum alloy inner core;

[0062] S2: Take another piece of metal Al with a volume 1.5 times that of the aluminum alloy inner core, and process the metal Al into a sleeve to obtain a pure aluminum sleeve;

[0063] S3: Using a universal material testing machine, the pure aluminum sleeve and the aluminum alloy inner core are aligned and then compressed to obtain a gradient structure aluminum alloy ingot; S4: The aluminum alloy ingot is fed into an extruder for hot extrusion at a temperature of 400°C and an extrusion speed of 1 mm / s to obtain a gradient structure aluminum alloy wire. The obtained gradient structure aluminum alloy wire has a diameter of 10 mm;

[0064] S5: The gradient structure aluminum alloy wire is subjected to a double-stage solution treatment and a double-stage aging treatment to obtain a final aluminum alloy wire. In the double-stage solution treatment, the temperature of the first stage solution treatment is 450°C and the time is 1 hour, and the temperature of the second stage solution treatment is 490°C and the time is 0.5 hour. In the double-stage aging treatment, the temperature of the first stage aging treatment is 120°C and the time is 4 hours, and the temperature of the second stage aging treatment is 175°C and the time is 3 hours.

[0065] Comparative Example 1: basically the same as Example 3, except that step S5 is omitted:

[0066] Comparative Example 2: The same as Example 3, except that step S5 is modified as follows: a two-stage solid solution treatment is performed on the gradient structure aluminum alloy wire to obtain a final aluminum alloy wire. In the two-stage solid solution treatment, the temperature of the first stage solid solution treatment is 450° C. and the time is 1 hour, and the temperature of the second stage solid solution treatment is 490° C. and the time is 0 hour.

[0067] Control Example 3: basically the same as Control Example 2, except that the second stage solution treatment time is 0.5 hours;

[0068] Control Example 4: basically the same as Control Example 2, except that the second stage solution treatment time is 1 hour;

[0069] Comparative Example 5: basically the same as Comparative Example 2, except that the second stage solution treatment time is 1.5 hours;

[0070] Comparative Example 6: basically the same as Comparative Example 2, except that the second stage solution treatment time is 2 hours;

[0071] Comparative Example 7: basically the same as Example 3, except that the second-stage aging treatment time is 0 hours;

[0072] Comparative Example 8: basically the same as Example 3, except that the second-stage aging treatment time is 1 hour;

[0073] Comparative Example 9: basically the same as Example 3, except that the second-stage aging treatment time is 5 hours;

[0074] Comparative Example 10: basically the same as Example 3, except that the second-stage aging treatment time is 7 hours;

[0075] The final aluminum alloy wires obtained in Comparative Examples 1-6 were tested for tensile strength, elongation and yield strength. The test results are as follows: Figure 1 As shown in the figure, when the second-stage solution treatment time is 0.5h, the tensile strength, elongation and yield strength of the aluminum alloy wire are the best, with a tensile strength of 271MPa, an elongation of 13.26%, and a yield strength of 130MPa. It can be seen that compared with no double-stage solution treatment and double-stage aging treatment, double-stage solution treatment can improve the mechanical properties of the aluminum alloy wire. When the second-stage solution treatment time is 0.5h, the mechanical properties of the aluminum alloy wire are the best.

[0076] The tensile strength, elongation and yield strength of the final aluminum alloy wires obtained in Comparative Examples 7-10 and Example 3 were tested. The test results are as follows: Figure 2 and Figure 3 As shown, when the second-stage aging treatment time is 3h, the tensile strength, elongation and yield strength of the aluminum alloy wire are the best, and its tensile strength is 309MPa, the elongation is 9.54%, and the yield strength is 267MPa. It can be seen that compared with the control example 3, the mechanical properties of Example 3 are the best. It can be seen that the two-stage aging treatment can effectively improve the mechanical properties of the aluminum alloy wire. The comparison between the control examples 7-10 and the embodiment 3 shows that when the second-stage aging treatment time is 3 hours, its mechanical properties are the best.

[0077] The conductivity test of the final aluminum alloy wire obtained in Comparative Examples 7-10 and Example 3 was carried out, and the results are as follows: Figure 4 As shown by Figure 4 It can be seen that the conductivity of the aluminum alloy wire increases with the increase of the second aging treatment time. When the second aging treatment time reaches 3 hours, the conductivity is greatly improved, and its mechanical properties are the best at this time.

[0078] The present invention is described by way of example, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of the present invention.

Claims

1. A method for producing an aluminum alloy wire, characterized in that: The following steps are involved: S1: Preparation of aluminum alloy inner core: S101: Weigh pure Si powder, metal Mg, metal Sr, metal Zr, metal Nb, metal Mn, metal Al, and pure B powder, wherein the mass of pure Si powder accounts for 0.4%-0.7% of the total raw material mass, the mass of metal Mg accounts for 0.4%-0.8% of the total raw material mass, the mass of metal Sr accounts for 0.03%-0.1% of the total raw material mass, the mass of metal Zr accounts for 0.25%-0.35% of the total raw material mass, the mass of metal Nb accounts for 0.1%-0.3% of the total raw material mass, the mass of metal Mn accounts for 0.05%-0.1% of the total raw material mass, the mass of pure B powder accounts for 0.01%-0.063% of the total raw material mass, and the remaining raw material is metal Al; S102: placing metal Al into an alumina crucible in a vacuum induction melting furnace, evacuating the furnace and filling it with argon, starting the vacuum induction melting furnace, completely melting the metal Al, then adding metal Zr and metal Nb to the alumina crucible and heating them until completely melted, then adding pure Si powder and metal Mn to the alumina crucible and heating them until completely melted, then adding pure B powder to the alumina crucible and heating them until completely melted, then adding metal Mg and metal Sr to the alumina crucible and heating them until completely melted, and then stirring to obtain a melt; S103: Cooling the melt to the pouring temperature and keeping it still; S104: Under an argon atmosphere, the melt is subjected to high-energy ultrasonic treatment using an ultrasonic device; S105: Using semi-solid rheology forming process to make the melt into alloy rods; S106: turning the alloy rod into a core rod shape to obtain an aluminum alloy inner core; S2: Take another piece of metal Al with a volume 1.5 times that of the aluminum alloy inner core, and process the metal Al into a sleeve to obtain a pure aluminum sleeve; S3: Using a universal material testing machine, the pure aluminum sleeve and the aluminum alloy inner core are aligned and compressed to obtain an aluminum alloy ingot with a gradient structure; S4: feeding the aluminum alloy ingot into an extruder for hot extrusion to obtain a gradient structure aluminum alloy wire; S5: The gradient structure aluminum alloy wire is subjected to a two-stage solid solution treatment and a two-stage aging treatment, wherein the temperature of the first stage solid solution treatment is 445°C-455°C, and the time is 1 hour, the temperature of the second stage solid solution treatment is 485°C-495°C, and the time is 0-1 hour, the temperature of the first stage aging treatment is 115°C-125°C, and the time is 4 hours, and the temperature of the second stage aging treatment is 170°C-180°C, and the time is 1-3 hours, to obtain the final aluminum alloy wire.

2. The method for producing an aluminum alloy wire according to claim 1, wherein: In step S102, the vacuum is drawn and argon is filled until the pressure in the vacuum induction melting furnace reaches 2×10 4 Pa, stirring speed is 100-150 rpm, and stirring time is 1-2 hours.

3. The method for producing an aluminum alloy wire according to claim 1, wherein: The pouring temperature in step S103 is 700-750° C., and the standing and heat preservation time is 20-30 minutes.

4. The method for producing an aluminum alloy wire according to claim 1, wherein: The power of the high-energy ultrasonic treatment in step S104 is 1100W-1500W, and the treatment time is 30-60 minutes.

5. The method for producing an aluminum alloy wire according to claim 1, wherein: The semi-solid rheological forming process in step S105 is implemented by a continuous rheological extruder. The rotation speed of the extrusion wheel in the continuous rheological extruder is 7.5 m / min, and the flow rate of cooling water in the continuous rheological extruder is 14 L / min.

6. The method for producing an aluminum alloy wire according to claim 1, wherein: The hot extrusion temperature in step S4 is 400° C., the extrusion speed is 1 mm / s, and the diameter of the obtained gradient structure aluminum alloy wire is 10 mm.

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