Homogenizing preparation method of 6082 aluminum alloy

Abstract

The invention discloses a homogenization preparation method of 6082 aluminum alloy, which comprises the following steps: adding raw materials into a smelting furnace for smelting treatment to obtain aluminum alloy smelting liquid; the aluminum alloy refining liquid is subjected to refining treatment and then stands for 20-30 min, and refined aluminum liquid is obtained; the refined molten aluminum is filtered, and filtered aluminum alloy is obtained; the filtered aluminum alloy is subjected to casting treatment, and an aluminum bar is obtained; the aluminum bar is subjected to homogenization treatment, and a homogenized aluminum alloy is obtained; the homogenized aluminum alloy is subjected to extrusion treatment, and the aluminum alloy profile is obtained; the aluminum alloy profile is subjected to online quenching, and a quenched aluminum alloy is obtained; and the quenched aluminum alloy is subjected to artificial aging treatment, and the 6082 aluminum alloy for the automobile is obtained. According to the homogenization preparation method of the 6082 aluminum alloy, the tensile strength, the yield strength and the ductility of the obtained 6082 aluminum alloy for the automobile are very excellent.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloys, and in particular, to a homogenization preparation method for 6082 aluminum alloy. Background Art

[0002] The automotive industry is using 6-series aluminum alloy profiles more and more widely, and the performance requirements are getting higher and higher. Among them, 6082 aluminum alloy is widely used in the production of automotive profile accessories, such as anti-collision beams, door sill beams, etc. due to its excellent comprehensive performance. The comprehensive performance of the product is closely related to the quality of the aluminum rod. The quality of the aluminum rod is crucial for subsequent extrusion production, and the homogenization process plays a decisive role in extrusion efficiency and the product. Homogenization has become an essential link in the production process of automotive materials. However, the general existing homogenization process for 6082 aluminum alloy adopts single-stage heat preservation for 10-20 hours or multi-stage homogenization process. Under the background of increasingly fierce industry competition and carbon-neutral green environmental protection, energy consumption and production costs have become a challenge. The modification of strontium (Sr) is often applied to cast aluminum alloys, but it is rarely seen in extruded aluminum alloys. CN116145057A discloses a homogenization process method for 6-series aluminum alloy plates and the application of this process method in the production of aluminum alloy plates. However, it adopts two-stage homogenization, resulting in high energy consumption.

[0003] In summary, after a large number of searches by the applicant, there is at least a problem in the field that the homogenization heat treatment holding time of 6082 alloy aluminum rods in aluminum rod production units is long and the energy consumption is high. Therefore, it is necessary to develop or improve a homogenization preparation method for 6082 aluminum alloy. Summary of the Invention

[0004] Based on this, in order to solve the problems of long homogenization heat treatment holding time and high energy consumption of 6082 alloy aluminum rods in aluminum rod production units, the present invention provides a homogenization preparation method for 6082 aluminum alloy, which can effectively shorten the homogenization holding time of the aluminum rod, improve the homogenization production efficiency, reduce the production costs of electricity and natural gas, and at the same time improve the performance and surface quality of the extruded product. The specific technical solutions are as follows:

[0005] A homogenization preparation method for 6082 aluminum alloy, which includes the following steps:

[0006] Melting: Adding raw materials into a melting furnace for melting treatment to obtain an aluminum alloy melt;

[0007] Refining: Refining the aluminum alloy melt, and then standing for 20-30 minutes to obtain refined aluminum liquid;

[0008] Filtering: Filtering the refined aluminum liquid to obtain filtered aluminum alloy;

[0009] Casting: Casting the filtered aluminum alloy to obtain an aluminum rod;

[0010] Homogenization: The aluminum rod is subjected to homogenization treatment to obtain homogenized aluminum alloy.

[0011] Extrusion forming: The homogenized aluminum alloy is subjected to extrusion treatment to obtain aluminum alloy profiles.

[0012] Online quenching: The aluminum alloy profiles are subjected to online quenching to obtain quenched aluminum alloy.

[0013] Artificial aging: The quenched aluminum alloy is subjected to artificial aging treatment to obtain 6082 aluminum alloy for automobiles.

[0014] Furthermore, based on the total mass of the 6082 aluminum alloy as 100%, the raw materials include 0.7 - 1.0 wt% of Si; 0.01 - 0.09 wt% of Cu; 0.6 - 0.9 wt% of Mg; 0.4 - 0.6 wt% of Mn; 0.1 - 0.3 wt% of Fe; 0.01 - 0.09 wt% of Cr; 0.011 - 0.029 wt% of Ti; 0.02 - 0.05 wt% of Sr; and the balance of Al.

[0015] Furthermore, the temperature of the melting treatment is 730 - 750 °C.

[0016] Furthermore, the temperature of the refining treatment is 745 - 760 °C, the time of the refining treatment is 40 - 50 min, and the refining treatment is online degassing with high-purity argon.

[0017] Furthermore, the filtering treatment is double-stage filtering.

[0018] Furthermore, the temperature of the casting treatment is 710 - 750 °C, the speed of the casting treatment is 25 - 30 mm / min, the water pressure of the casting treatment is 0.05 - 0.07 MPa, and the casting treatment is water-cooled casting.

[0019] Furthermore, the homogenization treatment includes the following steps:

[0020] Homogenize the aluminum rod, then take it out of the furnace, then cool it to 380 - 420 °C with strong wind at a cooling rate of 300 - 500 °C / h, and then cool it to room temperature with air mist to obtain the homogenized aluminum alloy.

[0021] The homogenization temperature is 560 - 570 °C, and the homogenization time is 3 - 4 h.

[0022] Furthermore, the extrusion treatment includes the following steps:

[0023] Preheat the homogenized aluminum alloy, and then extrude it through an extrusion cylinder and a die to obtain the aluminum alloy profiles.

[0024] The temperature of the extrusion is 470 - 500 °C, and the temperature at the discharge port is 510 - 540 °C.

[0025] Furthermore, the on-line quenching method is air-cooling quenching or water-cooling quenching;

[0026] The cooling rate of the on-line quenching is ≥18 °C / s.

[0027] Furthermore, the temperature of the artificial aging treatment is 170 - 180 °C, and the time of the artificial aging treatment is 6 - 10 h.

[0028] The homogenization preparation method of 6082 aluminum alloy provided by the above technical solution, due to its raw material containing 0.02 - 0.05 wt% of Sr and the homogenization treatment being carried out during the preparation process, the tensile strength, yield strength and elongation rate of the obtained 6082 aluminum alloy for automobiles are all very excellent. Specifically, the homogenization treatment can significantly reduce or eliminate the segregation of the 6082 aluminum bar ingot, dissolve the non-equilibrium phase, promote the uniform distribution of the dispersed phase, and transform the harmful coarse iron-rich phase into short rod-shaped, improving the subsequent extrusion processing and heat treatment properties. Below the overburn temperature, the higher the temperature, the faster the internal atomic diffusion and the shorter the required homogenization time. Sr is a surface-active element, which can change the behavior of the intermetallic phase crystallographically and can play a modification role after melting into the aluminum liquid. It promotes the direct formation of short rod-shaped α-AlFeSi phase at the beginning of the solidification process, shortening the time for the transformation of the original long needle-shaped β-AlFeSi phase to the rod-shaped α-AlFeSi phase, which is all completed by the homogenization step. Brief Description of the Drawings

[0029] Figure 1 It is the metallographic micrograph of the φ203 mm aluminum bar in Example 1;

[0030] Figure 2 It is the metallographic micrograph of the homogenized aluminum alloy in Example 1;

[0031] Figure 3 It is the metallographic micrograph of the homogenized aluminum alloy in Example 2;

[0032] Figure 4 It is the metallographic micrograph of the homogenized aluminum alloy in Comparative Example 1;

[0033] Figure 5 It is the metallographic micrograph of the homogenized aluminum alloy in Comparative Example 2;

[0034] Figure 6 It is the metallographic micrograph of the homogenized aluminum alloy in Comparative Example 3;

[0035] Figure 7It is a metallographic micrograph of the homogenized aluminum alloy in Comparative Example 4. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation manners described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific implementation manners and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] A homogenization preparation method for a 6082 aluminum alloy in an embodiment of the present invention includes the following steps:

[0039] Smelting: adding raw materials into a smelting furnace for smelting treatment to obtain an aluminum alloy melt;

[0040] Refining: performing refining treatment on the aluminum alloy melt, and then standing for 20 - 30 minutes to obtain refined aluminum liquid;

[0041] Filtering: performing filtering treatment on the refined aluminum liquid to obtain filtered aluminum alloy;

[0042] Casting: performing casting treatment on the filtered aluminum alloy to obtain an aluminum rod;

[0043] Homogenization: performing homogenization treatment on the aluminum rod to obtain homogenized aluminum alloy;

[0044] Extrusion forming: performing extrusion treatment on the homogenized aluminum alloy to obtain an aluminum alloy profile;

[0045] Online quenching: performing online quenching on the aluminum alloy profile to obtain quenched aluminum alloy;

[0046] Artificial aging: performing artificial aging treatment on the quenched aluminum alloy to obtain a 6082 aluminum alloy for automobiles.

[0047] In one embodiment, based on the total mass of the 6082 aluminum alloy being 100%, the raw materials include 0.7 - 1.0 wt% of Si; 0.01 - 0.09 wt% of Cu; 0.6 - 0.9 wt% of Mg; 0.4 - 0.6 wt% of Mn; 0.1 - 0.3 wt% of Fe; 0.01 - 0.09 wt% of Cr; 0.011 - 0.029 wt% of Ti; 0.02 - 0.05 wt% of Sr; and the balance of Al.

[0048] In one embodiment, the temperature of the melting treatment is 730 - 750 °C.

[0049] In one embodiment, the temperature of the refining treatment is 745 - 760 °C, the time of the refining treatment is 40 - 50 min, and the refining treatment is online degassing with high-purity argon.

[0050] In one embodiment, the filtering treatment is double-stage filtering.

[0051] In one embodiment, the temperature of the casting treatment is 710 - 750 °C, the speed of the casting treatment is 25 - 30 mm / min, the water pressure of the casting treatment is 0.05 - 0.07 MPa, and the casting treatment is water-cooled casting.

[0052] In one embodiment, the homogenization treatment includes the following steps:

[0053] Homogenize the aluminum rod, then take it out of the furnace, then cool it to 380 - 420 °C with strong wind at a cooling rate of 300 - 500 °C / h, and then cool it to room temperature with air mist to obtain the homogenized aluminum alloy;

[0054] The homogenization temperature is 560 - 570 °C, and the homogenization time is 3 - 4 h.

[0055] In one embodiment, the extrusion treatment includes the following steps:

[0056] Preheat the homogenized aluminum alloy, and then extrude it through an extrusion cylinder and a die to obtain the aluminum alloy profile;

[0057] The temperature of the extrusion is 470 - 500 °C, and the temperature at the discharge port is 510 - 540 °C.

[0058] In one embodiment, the method of online quenching is air-cooled quenching or water-cooled quenching;

[0059] The cooling rate of the online quenching is ≥18 °C / s.

[0060] In one of the embodiments, the temperature of the artificial aging treatment is 170 to 180 °C, and the time of the artificial aging treatment is 6 to 10 h.

[0061] The embodiments of the present invention will be described in detail below in conjunction with specific embodiments.

[0062] Example 1:

[0063] The raw materials prepared according to Table 1 are added to a melting furnace and melted at 740 °C to obtain an aluminum alloy melt; the above aluminum alloy melt is added to a refining furnace, the refining temperature is set at 753 °C, refined for 45 min, and high-purity argon is introduced for online degassing, and then left standing for 25 min to obtain refined aluminum liquid; the above refined aluminum liquid is subjected to a two-stage filtration treatment to obtain a filtered aluminum alloy; the above filtered aluminum alloy is cast at a temperature of 730 °C, under a water pressure of 0.06 MPa, at a speed of 28 mm / min, under water cooling conditions to obtain a φ203 mm aluminum rod; the above aluminum rod is homogenized at 565 °C for 3 h, then taken out of the furnace, and then cooled to 400 °C at a cooling rate of 400 °C / h with strong wind, and then cooled to room temperature by air mist cooling to obtain a homogenized aluminum alloy; the above homogenized aluminum alloy is preheated, the extrusion temperature is set at 485 °C, the outlet temperature is 525 °C, and then extruded through an extrusion cylinder and a die to obtain an aluminum alloy profile; the above aluminum alloy profile is subjected to online water quenching, and the cooling rate is 20 °C / s to obtain a quenched aluminum alloy; the above quenched aluminum alloy is subjected to artificial aging treatment, the temperature of the artificial aging treatment is 17 °C, and the time of the artificial aging treatment is 8 h. 6082 aluminum alloy for automobiles is obtained.

[0064] Example 2:

[0065] Add the raw materials prepared according to Table 1 into the smelting furnace and conduct smelting treatment at 740 °C to obtain aluminum alloy molten liquid; add the above aluminum alloy molten liquid into the refining furnace, set the refining temperature at 753 °C, refine for 45 min, introduce high-purity argon for online degassing, and then let it stand for 25 min to obtain refined aluminum liquid; conduct two-stage filtration treatment on the above refined aluminum liquid to obtain filtered aluminum alloy; cast the above filtered aluminum alloy at a temperature of 730 °C, under a water pressure of 0.06 MPa, at a speed of 28 mm / min under water cooling conditions to obtain a φ203 mm aluminum rod; homogenize the above aluminum rod at 565 °C for 4 h, then take it out of the furnace, and then cool it to 400 °C with strong wind at a cooling rate of 400 °C / h, and then cool it to room temperature with air mist to obtain homogenized aluminum alloy; preheat the above homogenized aluminum alloy, set the extrusion temperature at 485 °C and the discharge port temperature at 525 °C, and then extrude it through the extrusion cylinder and die to obtain aluminum alloy profiles; conduct online water-cooling quenching on the above aluminum alloy profiles with a cooling rate of 20 °C / s to obtain quenched aluminum alloy; conduct artificial aging treatment on the above quenched aluminum alloy, with the temperature of artificial aging treatment at 17 °C and the time of artificial aging treatment at 8 h. Obtain 6082 aluminum alloy for automobiles.

[0066] Comparative Example 1:

[0067] Add the raw materials prepared according to Table 1 into the smelting furnace and conduct smelting treatment at 740 °C to obtain aluminum alloy molten liquid; add the above aluminum alloy molten liquid into the refining furnace, set the refining temperature at 753 °C, refine for 45 min, introduce high-purity argon for online degassing, and then let it stand for 25 min to obtain refined aluminum liquid; conduct two-stage filtration treatment on the above refined aluminum liquid to obtain filtered aluminum alloy; cast the above filtered aluminum alloy at a temperature of 730 °C, under a water pressure of 0.06 MPa, at a speed of 28 mm / min under water cooling conditions to obtain a φ203 mm aluminum rod; preheat the above aluminum rod, set the extrusion temperature at 485 °C and the discharge port temperature at 525 °C, and then extrude it through the extrusion cylinder and die to obtain aluminum alloy profiles; conduct online water-cooling quenching on the above aluminum alloy profiles with a cooling rate of 20 °C / s to obtain quenched aluminum alloy; conduct artificial aging treatment on the above quenched aluminum alloy, with the temperature of artificial aging treatment at 17 °C and the time of artificial aging treatment at 8 h. Obtain 6082 aluminum alloy for automobiles.

[0068] Comparative Example 2:

[0069] The prepared raw materials according to Table 1 are added into a melting furnace for melting treatment at 740 °C to obtain an aluminum alloy melt; the above aluminum alloy melt is added into a refining furnace, the refining temperature is set at 753 °C, refined for 45 min, high-purity argon is introduced for online degassing, and then left standing for 25 min to obtain refined aluminum liquid; the above refined aluminum liquid is subjected to a two-stage filtration treatment to obtain a filtered aluminum alloy; the above filtered aluminum alloy is cast at a temperature of 730 °C, under a water pressure of 0.06 MPa, at a speed of 28 mm / min, under water cooling conditions to obtain a φ203 mm aluminum rod; the above aluminum rod is homogenized at 450 °C for 1 h, then taken out of the furnace, and then cooled to 400 with strong wind at a cooling rate of 400 °C / h, and then cooled to room temperature with air mist to obtain a homogenized aluminum alloy; the above homogenized aluminum alloy is preheated, the extrusion temperature is set at 485 °C, the outlet temperature is 525 °C, and then extruded through an extrusion cylinder and a die to obtain an aluminum alloy profile; the above aluminum alloy profile is subjected to online water-cooling quenching with a cooling rate of 20 °C / s to obtain a quenched aluminum alloy; the above quenched aluminum alloy is subjected to artificial aging treatment, the temperature of the artificial aging treatment is 17 °C, and the time of the artificial aging treatment is 8 h. An automotive 6082 aluminum alloy is obtained.

[0070] Comparative Example 3:

[0071] The prepared raw materials according to Table 1 are added into a melting furnace for melting treatment at 740 °C to obtain an aluminum alloy melt; the above aluminum alloy melt is added into a refining furnace, the refining temperature is set at 753 °C, refined for 45 min, high-purity argon is introduced for online degassing, and then left standing for 25 min to obtain refined aluminum liquid; the above refined aluminum liquid is subjected to a two-stage filtration treatment to obtain a filtered aluminum alloy; the above filtered aluminum alloy is cast at a temperature of 730 °C, under a water pressure of 0.06 MPa, at a speed of 28 mm / min, under water cooling conditions to obtain a φ203 mm aluminum rod; the above aluminum rod is homogenized at 600 °C for 5 h, then taken out of the furnace, and then cooled to 400 with strong wind at a cooling rate of 400 °C / h, and then cooled to room temperature with air mist to obtain a homogenized aluminum alloy; the above homogenized aluminum alloy is preheated, the extrusion temperature is set at 485 °C, the outlet temperature is 525 °C, and then extruded through an extrusion cylinder and a die to obtain an aluminum alloy profile; the above aluminum alloy profile is subjected to online water-cooling quenching with a cooling rate of 20 °C / s to obtain a quenched aluminum alloy; the above quenched aluminum alloy is subjected to artificial aging treatment, the temperature of the artificial aging treatment is 17 °C, and the time of the artificial aging treatment is 8 h. An automotive 6082 aluminum alloy is obtained.

[0072] Comparative Example 4:

[0073] The raw materials prepared according to Table 1 are added to a smelting furnace and smelted at 740 °C to obtain an aluminum alloy melt; the above aluminum alloy melt is added to a refining furnace, the refining temperature is set at 753 °C, refined for 45 min, and high-purity argon is introduced for online degassing, and then left standing for 25 min to obtain refined aluminum liquid; the above refined aluminum liquid is subjected to a two-stage filtration treatment to obtain a filtered aluminum alloy; the above filtered aluminum alloy is cast at a temperature of 730 °C under a water pressure of 0.06 MPa at a speed of 28 mm / min under water cooling conditions to obtain a φ203 mm aluminum rod; the above aluminum rod is homogenized at 565 °C for 3 h, then taken out of the furnace, and then cooled to room temperature with strong wind at a cooling rate of 200 °C / h to obtain a homogenized aluminum alloy; the above homogenized aluminum alloy is preheated, the extrusion temperature is set at 485 °C, the outlet temperature is set at 525 °C, and then extruded through an extrusion cylinder and a die to obtain an aluminum alloy profile; the above aluminum alloy profile is subjected to online water-cooling quenching at a cooling rate of 20 °C / s to obtain a quenched aluminum alloy; the above quenched aluminum alloy is subjected to artificial aging treatment at a temperature of 17 °C for a time of 8 h. 6082 aluminum alloy for automobiles is obtained.

[0074] The raw material compositions of Examples 1-2 and Comparative Examples 1-4 are shown in Table 1.

[0075] Table 1:

[0076]

[0077] The properties of the 6082 aluminum alloy for automobiles prepared in Examples 1-2 and Comparative Examples 1-4 are shown in Table 2.

[0078] Table 2:

[0079] Mechanical properties Aging state Tensile strength / MPa Yield strength / MPa Elongation / % Example 1 T6 380.6 354.8 18.22 Example 2 T6 382.5 355.6 19.08 Comparative example 1 T6 314.2 292.4 13.88 Comparative example 2 T6 320.3 298.5 13.98 Comparative example 3 T6 326.7 302.6 12.62 Comparative example 4 T6 331.4 305.0 14.10

[0080] As can be seen from Table 2, Examples 1-2 are the homogenization preparation methods of the 6082 aluminum alloy provided by this application. Due to its raw materials containing 0.02-0.05 wt% of Sr and the homogenization treatment carried out during the preparation process, the tensile strength, yield strength and elongation of the 6082 aluminum alloy for automobiles obtained are all very excellent. Specifically, the homogenization treatment can significantly reduce or eliminate the segregation of the 6082 aluminum rod ingot, dissolve the non-equilibrium phases, promote the uniform distribution of the dispersed phases, and the transformation of harmful coarse iron-rich phases into short rod-shaped ones, improving the subsequent extrusion processing and heat treatment properties. Below the overburn temperature, the higher the temperature, the faster the internal atomic diffusion and the shorter the required homogenization time. Sr is a surface-active element that can change the behavior of intermetallic phases crystallographically and can play a modification role after melting into the aluminum liquid. It promotes the direct formation of short rod-shaped α-AlFeSi phases at the beginning of the solidification process, shortening the time required for the transformation of the original long needle-shaped β-AlFeSi phases into rod-shaped α-AlFeSi phases, which is all completed by the homogenization step.

[0081] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0082] The above-described embodiments only express several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A homogenization preparation method of 6082 aluminum alloy, characterized in that: It includes the following steps: Melting: adding raw materials into a melting furnace for melting treatment to obtain aluminum alloy liquid; Refining: refining the aluminum alloy molten metal, and then standing it for 20 to 30 minutes to obtain refined aluminum liquid; Filtration: filtering the refined aluminum liquid to obtain a filtered aluminum alloy; Casting: casting the filtered aluminum alloy to obtain an aluminum rod; Homogenization: homogenizing the aluminum rod to obtain a homogenized aluminum alloy; Extrusion molding: extruding the uniform aluminum alloy to obtain an aluminum alloy profile; Online quenching: quenching the aluminum alloy profile online to obtain a quenched aluminum alloy; Artificial aging: The quenched aluminum alloy is subjected to artificial aging treatment to obtain 6082 aluminum alloy for automobiles.

2. The homogenization preparation method according to claim 1, characterized in that: Based on the total mass of the 6082 aluminum alloy, the raw materials include 0.7-1.0wt% Si; 0.01-0.09wt% Cu; 0.6-0.9wt% Mg; 0.4-0.6wt% Mn; 0.1-0.3wt% Fe; 0.01-0.09wt% Cr; 0.011-0.029wt% Ti; 0.02-0.05wt% Sr; and the balance is Al.

3. The homogenization preparation method according to claim 1, characterized in that: The temperature of the smelting treatment is 730-750°C.

4. The homogenization preparation method according to claim 1, characterized in that: The temperature of the refining treatment is 745-760° C., the time of the refining treatment is 40-50 min, and the refining treatment is online degassing with high-purity argon gas.

5. The homogenization preparation method according to claim 1, characterized in that: The filtration process is a double-stage filtration.

6. The homogenization preparation method according to claim 1, characterized in that: The temperature of the casting process is 710-750° C., the speed of the casting process is 25-30 mm / min, the water pressure of the casting process is 0.05-0.07 MPa, and the casting process is water-cooled casting.

7. The homogenization preparation method according to claim 1, characterized in that: The homogenization process comprises the following steps: The aluminum rod is homogenized, then taken out of the furnace, and then cooled to 380-420° C. by strong wind at a cooling rate of 300-500° C. / h, and then cooled to room temperature by wind and mist to obtain the homogenized aluminum alloy; The homogenization temperature is 560-570° C., and the homogenization time is 3-4 hours.

8. The homogenization preparation method according to claim 1, characterized in that: The extrusion process comprises the following steps: Preheating the homogenized aluminum alloy, and then extruding it through an extrusion cylinder and a die to obtain the aluminum alloy profile; The extrusion temperature is 470-500°C, and the discharge port temperature is 510-540°C.

9. The homogenization preparation method according to claim 1, characterized in that: The online quenching method is air-cooling quenching or water-cooling quenching; The cooling rate of the online quenching is ≥18°C / s.

10. The homogenization preparation method according to claim 1, characterized in that: The temperature of the artificial aging treatment is 170-180° C., and the time of the artificial aging treatment is 6-10 hours.

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