A high conductivity aluminium alloy and a method of producing a profile product therefrom

Abstract

The application discloses a high-conductivity aluminum alloy and a preparation method of profile products of the high-conductivity aluminum alloy, and the content of each component is as follows in percentage by mass: Si: 0.55%-0.65%, Fe: 0.10%-0.20%, Cu: 0.25%-0.35%, Mn: 0.55%-0.85%, Mg: 1.1%-1.4%, Zr: 0.25%-0.35%, and the balance is Al and other inevitable impurity elements. The mass ratio of Mg to Si is greater than or equal to 1.9, and the total content of Cu and Fe is less than or equal to 0.45%. The high-conductivity aluminum alloy optimizes alloy elements such as Si, Mg, Mn and Zr, adds Cu elements, and through the control of the content of each component, the mutual coordination between elements is realized, and the prepared aluminum alloy profile products have high conductivity, high strength and excellent production and processing performance. In addition, the short-time homogenization or non-homogenization method is adopted, the short-process preparation of the high-conductivity aluminum alloy and the profile products of the high-conductivity aluminum alloy is realized, and the production cost is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy technology, and more specifically to a method for preparing a high-conductivity aluminum alloy and its profile products. Background Technology

[0002] In recent years, aluminum alloys have become an important choice in the field of conductive materials due to their excellent electrical conductivity, and are widely used in high-speed rail conductive rails, magnetic levitation track induction plates, and instrument housings. These applications not only require materials with high electrical conductivity, but also good mechanical properties.

[0003] While aluminum alloys possess superior mechanical properties, their electrical conductivity is relatively weak. The mechanical properties and electrical conductivity of aluminum alloys are primarily influenced by their alloy composition and microstructure. However, simultaneously improving the strength and electrical conductivity of an alloy is challenging, as these two goals are often contradictory. For example, processes such as solid solution strengthening, precipitation strengthening, dispersion strengthening, and grain refinement can increase the strength of an alloy, but at the same time, they can decrease its electrical conductivity. This is because an increase in lattice defects and aggravation of lattice distortion in the alloy increases dislocation resistance, thereby improving strength; however, these defects and distortions also increase electron scattering, leading to a decrease in electrical conductivity.

[0004] In the prior art, CN201911372828.9 discloses a high conductivity 6-series aluminum alloy and its manufacturing process. The high conductivity 6-series aluminum alloy is formulated from the following elemental components in weight percentages: Si: 0.55–0.60%, Fe:

[0005] The alloy composition is as follows: Cu: 0.10–0.15%, Mn: 0.01–0.02%, Mg: 0.60–0.65%, Cr: 0.01–0.02%, Ti ≤ 0.01%, Zn: 0.05–0.08%, V ≤ 0.01%, Gd: 0.15–0.18%, B: 0.015–0.02%, with individual impurities ≤ 0.03% and total impurities ≤ 0.10%, the balance being Al. Through improvements in formulation and process, the aluminum alloy achieves a tensile strength of 250 MPa, a yield strength of 210 MPa, an elongation after fracture of 16.7%, an electrical conductivity γ = 32.52 MS / m, and a hardness HB = 65. However, when applied to high-speed rail conductive rails, magnetic levitation track induction plates, and instrument housings, the aluminum alloy exhibits low strength, and its mechanical properties fail to meet the application requirements.

[0006] CN202311142033.5 discloses a high-strength, high-conductivity aluminum alloy material, its preparation method, and its applications. The aluminum alloy material comprises: Mg 0.38-0.64 wt.%, Si 0.28-0.52 wt.%, B 0.04-0.08 wt.%, Re 0.08-0.12 wt.%, Sc 0.05-0.08 wt.%, B 0.04-0.08 wt.%, (Cr+Mn+V+Ti) ≤0.01 wt.%, with the balance being Al and unavoidable impurities. The preparation method includes: sequentially processing the raw materials according to the formula through melting, horizontal continuous casting, continuous welding and extrusion, alternating forward and reverse drawing, and artificial aging. Through dual optimization design of composition and preparation process, the impurity content of the aluminum alloy material is effectively reduced, the microstructure of the aluminum alloy material is improved, and the high strength of the material is ensured while increasing its conductivity. However, the production cost of high-strength, high-conductivity aluminum alloy materials prepared by this method is high, and the process and operation steps are relatively complex, which is not conducive to mass production.

[0007] Therefore, manufacturing aluminum alloy profiles that possess both high conductivity and high strength presents significant challenges. Simultaneously, traditional aluminum alloy production processes are facing challenges due to their high energy consumption. Maintaining alloy performance while reducing production costs to achieve more environmentally friendly and economical manufacturing methods has become a major issue facing the aluminum alloy manufacturing industry. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preparing high-conductivity aluminum alloys and their profile products.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A high-conductivity aluminum alloy, characterized in that the components and their mass percentages are as follows: Si: 0.55%-0.65%, Fe: 0.10%-0.20%, Cu: 0.25%-0.35%, Mn: 0.55%-0.85%, Mg: 1.1%-1.4%, Zr: 0.25%-0.35%, with the balance being Al and other unavoidable impurity elements.

[0011] According to the above-mentioned high electrical conductivity aluminum alloy, the components and their mass percentages of the aluminum alloy are as follows: Si: 0.60%-0.65%, Fe: 0.15%-0.20%, Cu: 0.25%-0.30%, Mn: 0.65%-0.75%, Mg: 1.2%-1.3%, Zr: 0.30%-0.35%, with the balance being Al and other unavoidable impurity elements.

[0012] According to the above-mentioned high electrical conductivity aluminum alloy, the components and their mass percentages of the aluminum alloy are as follows: Si: 0.55%-0.60%, Fe: 0.10%-0.15%, Cu: 0.30%-0.35%, Mn: 0.70%-0.75%, Mg: 1.25%-1.3%, Zr: 0.25%-0.30%, with the balance being Al and other unavoidable impurity elements.

[0013] According to the above-mentioned high electrical conductivity aluminum alloy, the aluminum alloy has the following characteristics: the mass ratio of Mg to Si is ≥1.9.

[0014] According to the above-mentioned high electrical conductivity aluminum alloy, the aluminum alloy contains Cu+Fe≤0.45%.

[0015] A method for producing the above-mentioned high electrical conductivity aluminum alloy profile, characterized in that the preparation method includes:

[0016] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0017] (2) Casting: Casting molten aluminum alloy into ingots;

[0018] (3) Homogenization treatment: The aluminum alloy ingot is subjected to short-term homogenization treatment and then air-cooled to room temperature;

[0019] (4) Extrusion: The aluminum alloy ingot obtained in step (3) is extruded to obtain aluminum alloy profiles;

[0020] (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 0.9-1.2%;

[0021] (6) Heat treatment: The stretched profile in step (5) is quenched and aged.

[0022] According to the above method, the characteristic is that step (3) is a short-time homogenization treatment, and its process parameters are: heat preservation for 1-2 hours at a temperature of 540-560℃.

[0023] According to the above method, the extrusion process in step (4) is characterized by: preheating the aluminum alloy ingot, the die, and the extruder; the preheating temperature of the aluminum alloy ingot is 480℃-500℃; the preheating temperature of the die is 450℃-460℃; the preheating temperature of the extruder is 400℃-410℃, and the preheating time is 15-10min; the extrusion ratio is 25-35; the extrusion outlet temperature is controlled at 510℃-520℃, and the profile outlet speed is 2.5m / min-4.5m / min; subsequently, the extruded profile is cooled to 150℃ by online air mist cooling and then air-cooled to room temperature.

[0024] According to the above method, the characteristic is that the heat treatment process of the aluminum alloy profile in step (6) includes quenching and aging, and the process conditions are: quenching at 540℃ for 2-3 hours and water cooling; aging at 180℃-190℃ for 6-12 hours.

[0025] A method for producing the above-mentioned high electrical conductivity aluminum alloy profile, characterized in that the preparation method includes:

[0026] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0027] (2) Casting: Casting molten aluminum alloy into ingots;

[0028] (3) Extrusion: The aluminum alloy ingot obtained in step (2) is extruded to obtain aluminum alloy profiles;

[0029] (4) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 0.9-1.2%;

[0030] (5) Heat treatment: The stretched profile in step (5) is subjected to quenching and aging treatment.

[0031] According to the above method, the extrusion process in step (3) is characterized by: preheating the aluminum alloy ingot, the die, and the extruder; the preheating temperature of the aluminum alloy ingot is 480℃-500℃; the preheating temperature of the die is 450℃-460℃; the preheating temperature of the extruder is 400℃-410℃, and the preheating time is 15-10min; the extrusion ratio is 30-50; the extrusion outlet temperature is controlled at 510℃-520℃, and the profile outlet speed is 2.5m / min-4.5m / min; subsequently, the extruded profile is cooled to 150℃ by online air mist cooling and then air-cooled to room temperature.

[0032] According to the above preparation method, the characteristic is that the heat treatment process of the aluminum alloy profile in step (5) includes quenching and aging, and the process conditions are: quenching at 540℃ for 3-5 hours, followed by water cooling; aging at 180℃-190℃ for 6-12 hours.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. This invention optimizes the alloy element composition. Si, Mg, Mn, and Zr elements are beneficial for improving the mechanical properties of aluminum alloys. The Mg to Si mass ratio is ≥1.9, with excess Mg element improving the hot working properties of the aluminum alloy and reducing production pressure. The addition of Cu element causes the aluminum alloy profile to form dispersed phases such as Al2Cu during aging, improving its electrical conductivity. Furthermore, the total amount of Cu and Fe elements is controlled, with Fe content kept as low as possible to ensure high electrical conductivity of the aluminum alloy profile. Simultaneously, the aging precipitation temperature of Cu is lower than that of Mg and Si, effectively guaranteeing the mechanical properties of the alloy even under over-aging treatment.

[0035] 2. The homogenization and quenching processes in the technical solution of this invention are processed in a linked manner, using short-time homogenization or non-homogenization methods, to achieve short-process preparation of high electrical conductivity aluminum alloys and their profile products, effectively reducing their production and manufacturing costs.

[0036] 3. This invention develops a short-process preparation method for high electrical conductivity aluminum alloy and its profile products. The composition and mass ratio of the aluminum alloy material are optimized. After melting, casting and homogenization treatment, a high electrical conductivity aluminum alloy is obtained. Through extrusion, stretching and heat treatment, the high electrical conductivity aluminum alloy profile products are obtained, while ensuring the yield strength and tensile strength, and the conductivity is significantly improved. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments.

[0038] Example 1

[0039] A short-process preparation method for a high-conductivity aluminum alloy and its profile products is disclosed. The aluminum alloy comprises the following components and mass percentages: Si: 0.60%, Fe: 0.15%, Cu: 0.30%, Mn: 0.70%, Mg: 1.25%, Zr: 0.30%, with the balance being Al and other unavoidable impurity elements. Specifically, the mass ratio of Mg to Si is 2.08; and the Cu + Fe ratio is 0.45%.

[0040] The above-mentioned short-process preparation method for high electrical conductivity aluminum alloy and its profile products includes the following steps:

[0041] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0042] (2) Casting: Casting molten aluminum alloy into ingots;

[0043] (3) Homogenization treatment: The aluminum alloy ingot is subjected to short-time homogenization treatment, followed by air cooling to room temperature. The short-time homogenization treatment process parameters are: holding at 550℃ for 1.5h;

[0044] (4) Extrusion: The aluminum alloy ingot, tooling, and extrusion press are preheated. The preheating temperature of the aluminum alloy ingot is 480℃; the preheating temperature of the tooling is 450℃; the preheating temperature of the extrusion press is 400℃, and the preheating time is 13min; the extrusion ratio is 30; the extrusion outlet temperature is controlled at 510℃, and the profile outlet speed is 3.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air cooled to room temperature.

[0045] (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 1.2%;

[0046] (6) Heat treatment: The profile stretched in step (5) is subjected to quenching and aging treatment. The process conditions are: quenching at 540℃ for 2.5h, water cooling; aging at 185℃ for 9h.

[0047] Example 2

[0048] A short-process preparation method for a high-conductivity aluminum alloy and its profile products is disclosed. The aluminum alloy comprises the following components and mass percentages: Si: 0.60%, Fe: 0.15%, Cu: 0.30%, Mn: 0.70%, Mg: 1.25%, Zr: 0.30%, with the balance being Al and other unavoidable impurity elements. Specifically, the mass ratio of Mg to Si is 2.08; and the Cu + Fe ratio is 0.45%.

[0049] The above-mentioned short-process preparation method for high electrical conductivity aluminum alloy and its profile products includes the following steps:

[0050] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0051] (2) Casting: Casting molten aluminum alloy into ingots;

[0052] (3) Extrusion: The aluminum alloy ingot, tooling, and extrusion press are preheated. The preheating temperature of the aluminum alloy ingot is 480℃; the preheating temperature of the tooling is 450℃; the preheating temperature of the extrusion press is 400℃, and the preheating time is 13min; the extrusion ratio is 45; the extrusion outlet temperature is controlled at 510℃, and the profile outlet speed is 3.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air cooled to room temperature.

[0053] (4) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 1.2%;

[0054] (5) Heat treatment: The profile stretched in step (4) is subjected to quenching and aging treatment. The process conditions are: quenching at 540℃ for 4.5h, water cooling; aging at 185℃ for 9h.

[0055] Example 3

[0056] A short-process preparation method for a high-conductivity aluminum alloy and its profile products is disclosed. The aluminum alloy comprises the following components and their mass percentages: Si: 0.55%, Fe: 0.20%, Cu: 0.25%, Mn: 0.85%, Mg: 1.1%, Zr: 0.25%, with the balance being Al and other unavoidable impurity elements. Specifically, the mass ratio of Mg to Si is 2.00; and the Cu + Fe ratio is 0.45%.

[0057] The above-mentioned short-process preparation method for high electrical conductivity aluminum alloy and its profile products includes the following steps:

[0058] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0059] (2) Casting: Casting molten aluminum alloy into ingots;

[0060] (3) Homogenization treatment: The aluminum alloy ingot is subjected to a short-term homogenization treatment, followed by air cooling to room temperature. The process parameters for the short-term homogenization treatment are: holding at 540℃ for 2 hours;

[0061] (4) Extrusion: The aluminum alloy ingot, tooling, and extrusion press are preheated. The preheating temperature of the aluminum alloy ingot is 500℃; the preheating temperature of the tooling is 460℃; the preheating temperature of the extrusion press is 410℃, and the preheating time is 10min; the extrusion ratio is 25; the extrusion outlet temperature is controlled at 515℃, and the profile outlet speed is 2.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air cooled to room temperature.

[0062] (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 0.9%;

[0063] (6) Heat treatment: The profile stretched in step (5) is subjected to quenching and aging treatment. The process conditions are: quenching at 540℃ for 3 hours and water cooling; aging at 190℃ for 6 hours.

[0064] Example 4

[0065] A short-process preparation method for a high-conductivity aluminum alloy and its profile products is disclosed. The aluminum alloy comprises the following components and their mass percentages: Si: 0.65%, Fe: 0.10%, Cu: 0.35%, Mn: 0.55%, Mg: 1.4%, Zr: 0.35%, with the balance being Al and other unavoidable impurity elements. Specifically, the mass ratio of Mg to Si is 2.15; and the Cu + Fe ratio is 0.45%.

[0066] The above-mentioned short-process preparation method for high electrical conductivity aluminum alloy and its profile products includes the following steps:

[0067] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0068] (2) Casting: Casting molten aluminum alloy into ingots;

[0069] (3) Homogenization treatment: The aluminum alloy ingot is subjected to a short-term homogenization treatment, followed by air cooling to room temperature. The process parameters for the short-term homogenization treatment are: holding at 560℃ for 1 hour;

[0070] (4) Extrusion: The aluminum alloy ingot, tooling, and extrusion press are preheated. The preheating temperature of the aluminum alloy ingot is 490℃; the preheating temperature of the tooling is 455℃; the preheating temperature of the extrusion press is 405℃, and the preheating time is 15min; the extrusion ratio is 35; the extrusion outlet temperature is controlled at 520℃, and the profile outlet speed is 4.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air cooled to room temperature.

[0071] (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 1.0%;

[0072] (6) Heat treatment: The profile stretched in step (5) is subjected to quenching and aging treatment. The process conditions are: quenching at 540℃ for 2 hours and water cooling; aging at 180℃ for 12 hours.

[0073] Comparative Example 1

[0074] Compared with Example 1, the content of Si element in Comparative Example 1 is 0.95%, the content of Mg element is 1.0%, and the rest is the same as in Example 1.

[0075] Comparative Example 2

[0076] Compared with Example 1, the content of Cu element in Comparative Example 2 is 0.15%, the content of Fe element is 0.35%, and the rest is the same as in Example 1.

[0077] Comparative Example 3

[0078] A short-process preparation method for a high-conductivity aluminum alloy and its profile products is disclosed. The aluminum alloy comprises the following components and mass percentages: Si: 0.60%, Fe: 0.15%, Cu: 0.30%, Mn: 0.70%, Mg: 1.25%, Zr: 0.30%, with the balance being Al and other unavoidable impurity elements. Specifically, the mass ratio of Mg to Si is 2.08; and the Cu + Fe ratio is 0.45%.

[0079] The above-mentioned short-process preparation method for high electrical conductivity aluminum alloy and its profile products includes the following steps:

[0080] (1) Smelting: Add each component to the smelting furnace according to the mass percentage, melt, refine, remove slag, and let stand to obtain aluminum alloy melt;

[0081] (2) Casting: Casting molten aluminum alloy into ingots;

[0082] (3) Homogenization treatment: The aluminum alloy ingot is subjected to long-term homogenization treatment, followed by air cooling to room temperature. The long-term homogenization treatment process parameters are: holding at 550℃ for 4 hours;

[0083] (4) Extrusion: The aluminum alloy ingot, tooling, and extrusion press are preheated. The preheating temperature of the aluminum alloy ingot is 480℃; the preheating temperature of the tooling is 450℃; the preheating temperature of the extrusion press is 400℃, and the preheating time is 13min; the extrusion ratio is 30; the extrusion outlet temperature is controlled at 510℃, and the profile outlet speed is 3.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air cooled to room temperature.

[0084] (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 1.2%;

[0085] (6) Heat treatment: The profile stretched in step (5) is subjected to quenching and aging treatment. The process conditions are: quenching at 540℃ for 2.5h, water cooling; aging at 185℃ for 9h.

[0086] The table below shows the tensile strength, yield strength, elongation, and electrical conductivity of the high-conductivity aluminum alloy profiles prepared in Examples 1-3 and Comparative Examples 1-3 of this invention, respectively. The results are as follows:

[0087]

[0088] The aluminum alloy profiles obtained in Examples 1-3 all exhibit tensile strengths exceeding 350 MPa and electrical conductivity greater than 55% IACS, demonstrating the rationality of the material composition design and preparation process in this invention. Compared to Example 1, Comparative Example 1 contained 0.95% Si and 1.0% Mg, with a Mg / Si ratio of 1.05. The results showed that the strength of the aluminum alloy profiles prepared by this method was reduced, indicating that the Mg / Si ratio significantly affects the mechanical properties of the alloy. Compared to Example 1, Comparative Example 2 contained 0.15% Cu and 0.35% Fe. The results showed a significant decrease in the electrical conductivity of the resulting aluminum alloy profiles, proving that the Cu and Fe contents significantly affect the electrical conductivity of the aluminum alloy. Higher Cu content results in higher alloy conductivity, while excessive Fe leads to a significant decrease in conductivity and affects its mechanical properties. Compared to Example 1, Comparative Example 3 employed a traditional long-term homogenization treatment. The results showed that the product prepared in Comparative Example 3 was essentially identical in performance to the product prepared in Example 1, exhibiting good mechanical properties and high conductivity. This demonstrates that the difference between long-term and short-term homogenization has little effect on the high-conductivity aluminum alloy and its profile products in this invention. Therefore, the short-process preparation method using short-term or no homogenization is preferable. Furthermore, using the method of this invention to prepare high-conductivity aluminum alloy and its profile products can effectively reduce time and transportation costs, and improve production efficiency.

[0089] The above description is merely a preferred embodiment of the present invention and is not limited to the invention. It should be noted that those skilled in the art can make other equivalent improvements based on the technical teachings provided by the present invention, all of which can achieve the purpose of the present invention and should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a high-conductivity aluminum alloy profile, characterized in that, The preparation method includes: (1) Smelting: Each component is added to the smelting furnace according to the mass percentage, melted, refined, slag removed, and allowed to stand to obtain aluminum alloy melt; the components and mass percentages of the aluminum alloy are: Si: 0.55%-0.65%, Fe: 0.10%-0.20%, Cu: 0.25%-0.35%, Mn: 0.55%-0.85%, Mg: 1.1%-1.4%, Zr: 0.25%-0.35%, with the balance being Al and other unavoidable impurity elements; (2) Casting: Casting molten aluminum alloy into ingots; (3) Homogenization treatment: The aluminum alloy ingot is subjected to short-term homogenization treatment and then air-cooled to room temperature; (4) Extrusion: The aluminum alloy ingot obtained in step (3) is extruded to obtain aluminum alloy profiles; (5) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 0.9-1.2%; (6) Heat treatment: The stretched profile in step (5) is quenched and aged.

2. The preparation method according to claim 1, characterized in that, Step (3) is a short-time homogenization process with the following process parameters: heat preservation at 540-560℃ for 1-2 hours.

3. The preparation method according to claim 1, characterized in that, The extrusion process in step (4) is as follows: the aluminum alloy ingot, the die, and the extruder are preheated. The preheating temperature of the aluminum alloy ingot is 480℃-500℃; the preheating temperature of the die is 450℃-460℃; the preheating temperature of the extruder is 400℃-410℃, and the preheating time is 15-10min; the extrusion ratio is 25-35; the extrusion outlet temperature is controlled at 510℃-520℃, and the profile outlet speed is 2.5m / min-4.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air-cooled to room temperature.

4. The preparation method according to claim 1, characterized in that, The heat treatment process of the aluminum alloy profile in step (6) includes quenching and aging. The process conditions are: quenching at 540℃ for 2-3 hours and water cooling; aging at 180℃-190℃ for 6-12 hours.

5. A method for preparing a high-conductivity aluminum alloy profile, characterized in that, The preparation method includes: (1) Smelting: Each component is added to the smelting furnace according to the mass percentage, melted, refined, slag removed, and allowed to stand to obtain aluminum alloy melt; the components and mass percentages of the aluminum alloy are: Si: 0.55%-0.65%, Fe: 0.10%-0.20%, Cu: 0.25%-0.35%, Mn: 0.55%-0.85%, Mg: 1.1%-1.4%, Zr: 0.25%-0.35%, with the balance being Al and other unavoidable impurity elements; (2) Casting: Casting molten aluminum alloy into ingots; (3) Extrusion: The aluminum alloy ingot obtained in step (2) is extruded to obtain aluminum alloy profiles; (4) Stretching: The aluminum alloy profile is stretched, and the stretching rate is controlled at 0.9-1.2%; (5) Heat treatment: The stretched profile in step (5) is subjected to quenching and aging treatment.

6. The preparation method according to claim 5, characterized in that, The extrusion process in step (3) is as follows: the aluminum alloy ingot, the die, and the extruder are preheated. The preheating temperature of the aluminum alloy ingot is 480℃-500℃; the preheating temperature of the die is 450℃-460℃; the preheating temperature of the extruder is 400℃-410℃, and the preheating time is 15-10min; the extrusion ratio is 30-50; the extrusion outlet temperature is controlled at 510℃-520℃, and the profile outlet speed is 2.5m / min-4.5m / min; then the extruded profile is cooled to 150℃ by online air mist cooling and then air-cooled to room temperature.

7. The preparation method according to claim 5, characterized in that, The heat treatment process of the aluminum alloy profile in step (5) includes quenching and aging. The process conditions are: quenching at 540℃ for 3-5 hours and water cooling; aging at 180℃-190℃ for 6-12 hours.

8. A high-conductivity aluminum alloy profile prepared using the preparation method according to any one of claims 1-7, characterized in that, The components and their mass percentages of the aluminum alloy are as follows: Si: 0.55%-0.65%, Fe: 0.10%-0.20%, Cu: 0.25%-0.35%, Mn: 0.55%-0.85%, Mg: 1.1%-1.4%, Zr: 0.25%-0.35%, with the balance being Al and other unavoidable impurity elements.

9. A high-conductivity aluminum alloy profile according to claim 8, characterized in that, The components and their mass percentages of the aluminum alloy are as follows: Si: 0.60%-0.65%, Fe: 0.15%-0.20%, Cu: 0.25%-0.30%, Mn: 0.65%-0.75%, Mg: 1.2%-1.3%, Zr: 0.30%-0.35%, with the balance being Al and other unavoidable impurity elements.

10. A high-conductivity aluminum alloy profile according to claim 8, characterized in that, The components and their mass percentages of the aluminum alloy are as follows: Si: 0.55%-0.60%, Fe: 0.10%-0.15%, Cu: 0.30%-0.35%, Mn: 0.70%-0.75%, Mg: 1.25%-1.3%, Zr: 0.25%-0.30%, with the balance being Al and other unavoidable impurity elements.

11. A high-conductivity aluminum alloy profile according to claim 8, characterized in that, In the aluminum alloy, the mass ratio of Mg to Si is ≥1.

9.

12. A high-conductivity aluminum alloy profile according to claim 8, characterized in that, In the aluminum alloy: Cu+Fe≤0.45%.

Images