Preparation method of 6082A aluminum alloy and 6082A aluminum alloy

Abstract

This invention relates to the field of aluminum alloy materials and preparation technology, and particularly to a method for preparing 6082A aluminum alloy and the 6082A aluminum alloy itself. The 6082A aluminum alloy, by mass percentage, comprises: Mg 0.85~0.90%, Si 0.87%~0.92%, Fe≤0.11%, Cu≤0.05%, Cr≤0.05%, Mn 0.48%~0.54%, Zn≤0.03%, Ti 0.01%~0.015%, B 0.02%~0.03%, impurities <1.5%, with each individual impurity component <0.05%, and the balance being Al. The mass ratio of Mg to Si is 0.96~1.03. This invention optimizes the composition of the 6082A aluminum alloy and uses specific casting, extrusion, and aging treatments to obtain a 6082A aluminum alloy with higher mechanical properties and electrical conductivity.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy materials and preparation technology, and particularly to a method for preparing 6082A aluminum alloy and the 6082A aluminum alloy itself. Background Technology

[0002] High-strength, high-conductivity aluminum alloys play a crucial role in new energy vehicles, high-speed trains, and rail transportation. Their core characteristic lies in maintaining excellent electrical conductivity while simultaneously improving material strength. According to GB / T 3190-2020, the composition of conventional 6082A aluminum alloy, by mass percentage, includes: Mg 0.60%~1.20%, Si 0.7%~1.30%, Fe≤0.50%, Cu≤0.10%, Cr≤0.25%, Mn 0.40%~1.00%, Zn≤0.20%, Ti≤0.10%, impurities less than 0.15%, with no single impurity component less than 0.05%, and the balance being Al. Improving the mechanical properties of conventional 6082A aluminum alloy by increasing the Si and Mg content leads to a significant decrease in electrical conductivity; conversely, improving conductivity by reducing the alloy element content sacrifices strength, failing to meet the product's requirement for both performance and conductivity.

[0003] For example, Chinese patent CN114107753B discloses a design method for a 6082 aluminum alloy without parking effect, which limits the Si content and Mg / Si ratio in the 6082 aluminum alloy, wherein: Si element mass percentage: 1.1wt%≤Si≤1.25wt%, Mg / Si mass ratio: 0.4≤Mg / Si≤0.52; in the alloy preparation process, the cast 6082 aluminum alloy ingot is first homogenized by holding it at 520℃~580℃ for 6~15 hours, and then the homogenized 6082 aluminum alloy ingot is heated at 375℃~ The 6082 aluminum alloy forgings are forged at a ratio of 4:1 to 12:1 within a temperature range of 475℃, followed by solution treatment at 510℃ to 540℃ for 2 to 6 hours. After solution treatment, the 6082 aluminum alloy forgings are naturally aged for more than 7 days, and finally artificially aged at 155℃ to 185℃ for 4 to 12 hours. The long axis dimension of the rod-like precipitates within the 6082 aluminum alloy ranges from 20 to 50 nm, and the number density of intragranular precipitates ranges from 4000 to 5000 / μm². After long-term natural aging, the peak strength of the alloy ranges from 290 to 300 MPa. While this patent solves the problem of strength loss in aluminum alloys, it does not address the optimization of electrical conductivity.

[0004] Therefore, it is necessary to improve existing technologies to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing 6082A aluminum alloy and the 6082A aluminum alloy itself, in order to solve the problem that conventional 6082A aluminum alloys in the prior art have high mechanical properties but low electrical conductivity.

[0006] To achieve the above objectives, the present invention provides a method for preparing 6082A aluminum alloy, the method comprising the following steps:

[0007] S1. Raw materials: Raw materials are provided according to the composition ratio of the 6082A aluminum alloy. The composition of the 6082A aluminum alloy by mass percentage includes: Mg 0.85%~0.90%, Si 0.87%~0.92%, Fe≤0.11%, Cu≤0.05%, Cr≤0.05%, Mn 0.48%~0.54%, Zn≤0.03%, Ti 0.01%~0.015%, B 0.02%~0.03%, impurities <1.5%, and the individual impurity component <0.05%. The balance is Al, and the mass ratio of Mg to Si is 0.96~1.03.

[0008] S2, Smelting and Casting: First, melt all raw materials except B, then add B according to the specified proportion, then filter through a double-stage filter with a 30-50 mesh filter and a 50-70 mesh filter, and finally form an aluminum alloy ingot through casting.

[0009] S3. Extrusion molding: The aluminum alloy ingot is heated to 500℃-520℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 520℃-540℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles.

[0010] S4. Aging treatment: Artificial aging is performed on the aluminum alloy profiles. The aging temperature is raised to 185℃-195℃ and held for 8-9 hours. After aging, the profiles are removed from the furnace and cooled to room temperature by strong winds with a wind speed of 50km / h-60km / h.

[0011] Furthermore, the 6082A aluminum alloy has an electrical conductivity of ≥28MS / m and a hardness of ≥95HBW.

[0012] Further, in step S1, the 6082A aluminum alloy, by mass percentage, comprises: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al.

[0013] Furthermore, in step S2, the raw materials other than B are first melted, then B is added in the specified proportion, and then the mixture is filtered through a two-stage process using a 40-mesh filter and a 60-mesh filter. Finally, aluminum alloy ingots are formed by casting.

[0014] Further, in step S3, the aluminum alloy ingot is heated to 510°C for extrusion molding, and the temperature at the extrusion outlet is controlled at 530°C, followed by water quenching treatment.

[0015] Furthermore, in step S4, the aluminum alloy profile is artificially aged by heating it to 190°C and holding it for 9 hours. After aging, it is taken out of the furnace and cooled to room temperature by strong wind with a wind speed of 55 km / h.

[0016] A 6082A aluminum alloy was obtained using the above-described preparation method.

[0017] The present invention provides a method for preparing 6082A aluminum alloy and the 6082A aluminum alloy itself. Compared with the prior art, the present invention forms a fine Al(Mn,Si) dispersed phase with the Mn content and Al and Si in the alloy, which can effectively refine the grain structure of the extruded profile, improve the strength and toughness matching of the material, and inhibit the recrystallization process, thus maintaining the structural stability of the extruded profile. The synergistic addition of Ti and B forms a Ti-B combination, with Ti and Al forming a TiAl3 heterogeneous nucleation core. B can further increase the nucleation rate. The synergistic effect of these two elements can significantly refine the casting structure of the ingot, reduce casting defects such as columnar crystals and shrinkage cavities, and improve the ingot quality and subsequent extrusion forming performance. A Mg to Si mass ratio of 0.96–1.03 promotes the full bonding of Mg and Si atoms to form a uniformly dispersed Mg₂Si precipitate, while avoiding the formation of coarse or harmful phases (such as β-AlFeSi) due to excessive Si or Mg, which would impair conductivity. Furthermore, aging the aluminum alloy profile at 185–195℃ for 8–9 hours induces the precipitation of some Mg₂Si phases, and these precipitates themselves exhibit weak electron scattering, significantly improving conductivity. Therefore, the above-mentioned compositional combination and preparation method can enhance the mechanical properties and electrical conductivity of 6082A aluminum alloy. Detailed Implementation

[0018] The present invention will be described in detail below with reference to specific embodiments.

[0019] In this invention, unless otherwise explicitly specified and limited, terms such as "set in," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through one or more intermediate media. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The directional terms appearing in this invention are for the purpose of better describing the characteristics of the features and the relationships between them. It should be understood that when the orientation of this invention changes, the orientation of the characteristics of the features and the relationships between them also changes accordingly. Therefore, directional terms do not constitute an absolute spatial limitation on the characteristics of the features and the relationships between them, but only a relative limitation.

[0020] This invention provides a method for preparing 6082A aluminum alloy, the method comprising the following steps:

[0021] S1. Raw materials: Raw materials are provided according to the composition ratio of the 6082A aluminum alloy. The composition of the 6082A aluminum alloy by mass percentage includes: Mg 0.85~0.90%, Si 0.87%~0.92%, Fe≤0.11%, Cu≤0.05%, Cr≤0.05%, Mn 0.48%~0.54%, Zn≤0.03%, Ti 0.01%~0.015%, B 0.02%~0.03%, impurities <1.5%, and the individual impurity component <0.05%. The balance is Al, and the mass ratio of Mg to Si is 0.96~1.03.

[0022] S2, Smelting and Casting: First, melt all raw materials except B, then add B according to the specified proportion, then filter through a double-stage filter with a 30-50 mesh filter and a 50-70 mesh filter, and finally form an aluminum alloy ingot through casting.

[0023] S3. Extrusion molding: The aluminum alloy ingot is heated to 500℃-520℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 520℃-540℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles.

[0024] S4. Aging treatment: Artificial aging is performed on the aluminum alloy profiles. The aging temperature is raised to 185℃-195℃ and held for 8-9 hours. After aging, the profiles are removed from the furnace and cooled to room temperature by strong winds with a wind speed of 50km / h-60km / h.

[0025] This invention utilizes the Mn content mentioned above to form fine Al(Mn,Si) dispersed phases with Al and Si in the alloy. This effectively refines the grain structure of the extruded profile, improves the strength-toughness balance, and inhibits recrystallization, maintaining the structural stability of the extruded profile. The synergistic addition of Ti and B forms a Ti-B combination, with Ti and Al forming TiAl3 heterogeneous nucleation cores. B further enhances the nucleation rate. This synergistic effect significantly refines the casting structure of the ingot, reducing casting defects such as columnar crystals and shrinkage cavities, thus improving ingot quality and the forming performance of subsequent extrusion processing. The Mg to Si mass ratio of 0.96~1.03 promotes the full combination of Mg and Si atoms to form a uniformly dispersed Mg2Si precipitate, preventing the formation of coarse or harmful phases (such as β-AlFeSi) due to excessive Si or Mg, which would damage electrical conductivity. Furthermore, aging the aluminum alloy profile at 185~195℃ for 8~9 hours causes some Mg2Si phase to precipitate. Simultaneously, the precipitate itself exhibits weak electron scattering, significantly improving electrical conductivity. Therefore, by using the above-mentioned combination of components and preparation method, the mechanical properties and electrical conductivity of 6082A aluminum alloy can be improved.

[0026] Preferably, the 6082A aluminum alloy has an electrical conductivity ≥28MS / m and a hardness ≥95HBW.

[0027] Preferably, in step S1, the 6082A aluminum alloy, by mass percentage, comprises: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al.

[0028] Preferably, in step S2, the raw materials other than B are first melted, then B is added in the specified proportion, and then the mixture is filtered through a two-stage process using a 40-mesh filter and a 60-mesh filter, and finally cast to form an aluminum alloy ingot.

[0029] Preferably, in step S3, the aluminum alloy ingot is heated to 510°C for extrusion molding, and the temperature at the extrusion outlet is controlled at 530°C. Subsequently, it undergoes water cooling quenching treatment to obtain an aluminum alloy profile.

[0030] Preferably, in step S4, the aluminum alloy profile is artificially aged by heating it to 190°C and holding it for 9 hours. After aging, it is taken out of the furnace and cooled to room temperature by strong wind with a wind speed of 55 km / h.

[0031] A 6082A aluminum alloy was obtained using the above-described preparation method.

[0032] The following specific examples and comparative examples demonstrate the performance of aluminum alloy products prepared by different methods.

[0033] Example 1:

[0034] The preparation steps are as follows:

[0035] S1. Ingredients: According to the mass percentage provided by this invention, its composition includes: Mg 0.85%, Si 0.87%, Fe 0.09%, Cu 0.02%, Cr 0.01%, Mn 0.48%, Zn 0.01%, Ti 0.01%, B 0.02%, with the balance being Al and unavoidable impurities;

[0036] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 30-mesh filter and a 50-mesh filter, and finally form an aluminum alloy ingot through casting.

[0037] S3. Extrusion molding: The aluminum alloy ingot is heated to 500℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 520℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles.

[0038] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 185℃ for 8 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0039] Example 2:

[0040] The preparation steps are as follows:

[0041] S1. Ingredients: According to the mass percentage provided by this invention, its composition includes: Mg 0.90%, Si 0.92%, Fe 0.11%, Cu 0.05%, Cr 0.05%, Mn 0.54%, Zn 0.03%, Ti 0.015%, B 0.03%, with the balance being Al and unavoidable impurities;

[0042] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the specified proportion, then filter through a 50-mesh filter and a 70-mesh filter, and finally form an aluminum alloy ingot through casting.

[0043] S3. Extrusion molding: The aluminum alloy ingot is heated to 520℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 540℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles.

[0044] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 195℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0045] Example 3:

[0046] The preparation steps are as follows:

[0047] S1. Ingredients: According to the mass percentages provided by this invention, its composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities;

[0048] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0049] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0050] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 190℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0051] Example 4:

[0052] The preparation steps are as follows:

[0053] S1. Ingredients: According to the mass percentages provided in this invention, its composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities; its composition is the same as in Example 3.

[0054] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0055] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0056] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 190℃ for 8 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0057] Comparative Example 1:

[0058] The preparation steps are as follows:

[0059] S1. Ingredients: By mass percentage, its composition includes: Mg 0.89%, Si 0.92%, Fe 0.09%, Cu 0.02%, Cr 0.015%, Mn 0.52%, Zn 0.01%, Ti 0.01%, with the balance being Al and unavoidable impurities; its composition is very similar to that of Example 3, but without the addition of B;

[0060] S2, Smelting and Casting: The raw materials are smelted, then filtered through a 40-mesh filter and a 60-mesh filter, and finally cast to form aluminum alloy ingots.

[0061] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles.

[0062] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 190℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0063] Comparative Example 2:

[0064] The preparation steps are as follows:

[0065] S1. Raw materials: The raw materials are provided according to the composition ratio of 6082A aluminum alloy in GB / T 3190-2020 standard. By mass percentage, the composition includes: Mg 0.96%, Si 0.10%, Fe 0.48%, Cu 0.03%, Cr 0.212%, Mn 0.78%, Zn 0.18%, Ti 0.04%, Pb 0.003%, with the balance being Al and unavoidable impurities; B is not added in the national standard but Pb is added.

[0066] S2, Smelting and Casting: The raw materials are smelted, then filtered through a 40-mesh filter and a 60-mesh filter, and finally cast to form aluminum alloy ingots.

[0067] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0068] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 190℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0069] Comparative Example 3:

[0070] The preparation steps are as follows:

[0071] S1. Ingredients: By mass percentage, the composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities; Comparative Example 3 and Example 3 used the same molten aluminum pool.

[0072] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0073] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0074] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 190℃ for 14 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0075] Comparative Example 4:

[0076] The preparation steps are as follows:

[0077] S1. Ingredients: By mass percentage, the composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities; Comparative Example 4 and Example 3 used the same molten aluminum pool.

[0078] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0079] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0080] S4. Aging treatment: Artificial aging is performed on the aluminum alloy profiles at an aging temperature of 190℃ and a holding time of 4 hours. After aging, the profiles are removed from the furnace and cooled to room temperature using a strong wind with a wind speed of 55km / h.

[0081] Comparative Example 5:

[0082] The preparation steps are as follows:

[0083] S1. Ingredients: By mass percentage, the composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities; Comparative Example 5 and Example 3 used the same molten aluminum pool.

[0084] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0085] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0086] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 170℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0087] Comparative Example 6:

[0088] The preparation steps are as follows:

[0089] S1. Ingredients: By mass percentage, the composition includes: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al and unavoidable impurities; Comparative Example 6 and Example 3 used the same molten aluminum pool.

[0090] S2, Smelting and Casting: First, smelt all raw materials except B, then add B according to the proportion, then filter through a 40-mesh filter and a 60-mesh filter, and finally form an aluminum alloy ingot through casting.

[0091] S3. Extrusion molding: The aluminum alloy ingot is heated to 510℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 530℃. Then, water quenching treatment is performed to obtain aluminum alloy profiles.

[0092] S4. Aging treatment: The aluminum alloy profiles are artificially aged at a temperature of 220℃ for 9 hours. After aging, they are removed from the furnace and cooled to room temperature by strong winds at a speed of 55km / h.

[0093] Table 1. Comparison of ingredient composition between the examples and comparative examples.

[0094]

[0095] Table 2 Comparison of Aging Treatment between Examples and Comparative Examples

[0096]

[0097] Table 3. Comparison of electrical conductivity and Brinell hardness between the examples and comparative examples.

[0098]

[0099] It should be noted that the demander's performance requirements for 6082A aluminum alloy are: electrical conductivity ≥28MS / m and hardness ≥95HBW.

[0100] It should be noted that in the above embodiments and comparative examples, the parameters selected in the melting, casting and extrusion molding steps are all parameters commonly selected in the prior art for producing 6082A aluminum alloy. The differences between the embodiments and comparative examples are the different ingredients and the different parameters of the aging treatment. Therefore, only these differences are listed in the table above, and the parameters for the melting, casting and extrusion molding steps are not listed.

[0101] From Tables 1, 2, and 3 above, we can see that:

[0102] The 6082A aluminum alloys prepared by the methods of Examples 1, 2, 3 and 4 all meet the above performance requirements, and the 6082A aluminum alloy prepared by the method of Example 3 has the best performance.

[0103] Comparative Example 1 modified the composition of the ingredients. The difference between Comparative Example 1 and Example 3 is that element B was not added. The electrical conductivity of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 1 does not meet the above performance requirements.

[0104] Comparative Example 2 uses the standard ingredients, which do not contain B and have added Pb. The ingredients of Comparative Example 2 are not within the scope of this invention. The electrical conductivity of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 2 does not meet the above performance requirements.

[0105] Comparative Example 3 modified the holding time parameter of the aging treatment, and this holding time parameter is not within the scope of the present invention. The hardness of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 3 does not meet the above performance requirements.

[0106] Comparative Example 4 modified the holding time parameter of the aging treatment, and this holding time parameter is not within the scope of the present invention. The electrical conductivity and hardness of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 4 do not meet the above performance requirements.

[0107] Comparative Example 5 modified the aging temperature parameters of the aging treatment, and these aging temperature parameters are not within the scope of this invention. The electrical conductivity and hardness of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 5 do not meet the above performance requirements.

[0108] Comparative Example 6 modified the aging temperature parameters of the aging treatment, and these aging temperature parameters are not within the scope of this invention. The hardness of the 6082A aluminum alloy obtained by the preparation method of Comparative Example 6 does not meet the above performance requirements.

[0109] Therefore, it can be seen that the 6082A aluminum alloy obtained by the preparation method of the present invention can achieve the advantages of electrical conductivity ≥28MS / m and hardness ≥95HBW, ensuring that the 6082A aluminum alloy has both mechanical properties and high electrical conductivity.

[0110] In summary, the preparation method of this 6082A aluminum alloy and the 6082A aluminum alloy can solve the problem of conventional 6082A aluminum alloys in the prior art having high mechanical properties but low electrical conductivity.

[0111] Where there is no conflict, the above embodiments and features can be combined with each other.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing 6082A aluminum alloy, characterized in that: Its preparation method includes the following steps: S1. Raw materials: Raw materials are provided according to the composition ratio of the 6082A aluminum alloy. The composition of the 6082A aluminum alloy by mass percentage includes: Mg 0.85%~0.90%, Si 0.87%~0.92%, Fe≤0.11%, Cu≤0.05%, Cr≤0.05%, Mn0.48%~0.54%, Zn≤0.03%, Ti 0.01%~0.015%, B 0.02%~0.03%, impurities <1.5%, and the individual impurity component <0.05%. The balance is Al, and the mass ratio of Mg to Si is 0.96~1.

03. S2, Smelting and Casting: First, melt all raw materials except B, then add B according to the specified proportion, then filter through a double-stage filter with a 30-50 mesh filter and a 50-70 mesh filter, and finally form an aluminum alloy ingot through casting. S3. Extrusion molding: The aluminum alloy ingot is heated to 500℃-520℃ for extrusion molding, and the temperature at the extrusion outlet is controlled at 520℃-540℃. Then, it is subjected to water cooling quenching treatment to obtain aluminum alloy profiles. S4. Aging treatment: Artificial aging is performed on the aluminum alloy profiles. The aging temperature is raised to 185℃-195℃ and held for 8-9 hours. After aging, the profiles are removed from the furnace and cooled to room temperature by strong winds with a wind speed of 50km / h-60km / h.

2. The method for preparing 6082A aluminum alloy according to claim 1, characterized in that: The 6082A aluminum alloy has an electrical conductivity of ≥28MS / m and a hardness of ≥95HBW.

3. The method for preparing 6082A aluminum alloy according to claim 1, characterized in that: In step S1, the 6082A aluminum alloy, by mass percentage, comprises: Mg 0.886%, Si 0.917%, Fe 0.093%, Cu 0.022%, Cr 0.014%, Mn 0.518%, Zn 0.013%, Ti 0.013%, B 0.021%, with the balance being Al.

4. The method for preparing 6082A aluminum alloy according to claim 3, characterized in that: In step S2, all raw materials except B are first melted, then B is added in the specified proportion, and then the mixture is filtered through a two-stage process using a 40-mesh filter and a 60-mesh filter. Finally, aluminum alloy ingots are formed by casting.

5. The method for preparing 6082A aluminum alloy according to claim 4, characterized in that: In step S3, the aluminum alloy ingot is heated to 510°C for extrusion molding, and the temperature at the extrusion outlet is controlled at 530°C. Then, it is subjected to water quenching treatment to obtain aluminum alloy profile.

6. The method for preparing 6082A aluminum alloy according to claim 5, characterized in that: In step S4, the aluminum alloy profile is artificially aged by heating it to 190°C and holding it for 9 hours. After aging, it is taken out of the furnace and cooled to room temperature by strong wind at a speed of 55 km / h.

7. A 6082A aluminum alloy, characterized in that: It is obtained by the preparation method described in claim 6.

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