A heat treatment method for high-strength aluminum alloy deformation and phase change synergistic strengthening

Abstract

The application provides a heat treatment method for deformation and phase change synergistic strengthening of high-strength aluminum alloy, and relates to the technical field of aluminum-based alloy heat treatment. The method comprises the following steps: S10, solid solution treatment of the aluminum alloy at a solid solution temperature, quenching treatment after the solid solution treatment, and obtaining W-state aluminum alloy; S20, pre-aging treatment of the W-state aluminum alloy at a pre-aging temperature, and obtaining PA-state aluminum alloy after cooling; S30, 0-8% pre-deformation of the PA-state aluminum alloy, and obtaining pre-hardening treatment aluminum alloy; S40, first-stage aging treatment of the pre-hardening treatment aluminum alloy at a first aging temperature for 1-60 min, and obtaining first-stage aluminum alloy after cooling; wherein the first aging temperature is lower than the pre-aging temperature; S50, second-stage aging treatment of the first-stage aluminum alloy at a second aging temperature for 1-60 min, and obtaining second-stage aluminum alloy after cooling; wherein the second aging temperature is lower than the first aging temperature.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for aluminum-based alloys, and in particular to a heat treatment method for synergistic strengthening of high-strength aluminum alloys by deformation and phase transformation. Background Technology

[0002] Aluminum alloys are widely used in the automotive and aerospace industries due to their low density, high strength, and good corrosion resistance. However, after forming, aluminum alloys require subsequent aging treatment to improve their strength, especially to achieve peak aging mechanical properties. Aging treatment refers to a heat treatment process in which aluminum alloy workpieces, after solution treatment, high-temperature quenching, or a certain degree of cold working deformation, are placed at a relatively high temperature or room temperature to maintain their shape and dimensions, and their properties change over time. However, traditional manual aging treatment is time-consuming and inefficient, limiting the industrial application of high-strength aluminum alloys. Patent CN116377353A provides an optimized method for a high-rate heating re-aging process for 7xxx series aluminum alloys. This patent improves the performance of 7xxx series aluminum alloys by performing a first low-temperature aging, a re-aging, and a second low-temperature aging. However, the overall failure time in this patent is over 40 hours, indicating a long aging process.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention proposes a heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation. By combining deformation and phase transformation heat treatment, an aluminum alloy with mechanical properties close to the peak value of T6 state can be obtained with a shorter artificial aging time.

[0005] The technical solution of this invention is achieved as follows: a heat treatment method for synergistic strengthening of high-strength aluminum alloys by deformation and phase transformation is provided, comprising the following steps:

[0006] S10. At the solution treatment temperature, the aluminum alloy is subjected to solution treatment, and then quenched to obtain the W-state aluminum alloy.

[0007] S20. At the pre-aging temperature, the W-state aluminum alloy is pre-aged and then cooled to obtain the PA-state aluminum alloy.

[0008] S30. Perform 0-8% pre-deformation on PA state aluminum alloy to obtain pre-hardened aluminum alloy;

[0009] S40. At the first aging temperature, the pre-hardened aluminum alloy is subjected to a first-stage aging treatment for 1 to 60 minutes, and after cooling, a first-stage aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature;

[0010] S50. At the second aging temperature, the first-grade aluminum alloy is subjected to a second-stage aging treatment for 1 to 60 minutes, and after cooling, a second-grade aluminum alloy is obtained; wherein, the second aging temperature is lower than the first aging temperature.

[0011] Thus, in the solution provided by the present invention, through pre-aging, pre-deformation and secondary aging treatments, and with the temperature of each aging treatment satisfying that the pre-aging temperature ≥ the first-stage aging temperature > the second-stage aging temperature, the synergistic strengthening effect of deformation and phase transformation of aluminum alloy is achieved, and an aluminum alloy with mechanical properties at the T6 state peak value is obtained.

[0012] Based on the above technical solution, preferably, in step S10, the quenching treatment is a water quenching treatment; the water temperature used in the water quenching treatment is 20-25℃;

[0013] Before and after water quenching, the water temperature change should be less than or equal to 5℃, and the water quenching transfer time should not exceed 25 seconds.

[0014] Thus, by optimizing the initial water temperature, the changes in water temperature before and after water quenching, and the water quenching time during water quenching, the use of cold molds for quenching is avoided, which would result in T6 mechanical properties after artificial aging being lower than the mechanical properties after peak aging.

[0015] Based on the above technical solutions, preferably, in steps S20, S40 and S50, the cooling is intermediate cooling at a temperature of 15 to 25°C.

[0016] Based on the above technical solutions, preferably, in step S20, a GP region is formed in the pre-aging aluminum alloy;

[0017] In step S40, a first-level main strengthening phase is formed in the first-level aluminum alloy;

[0018] In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level aluminum alloy.

[0019] Based on the above technical solutions, preferably, in S10, a solution treatment temperature of 488-554℃ is used to treat the 2XXX series aluminum alloy, and water quenching is performed after the solution treatment for 5-100 minutes to obtain the W state 2XXX series aluminum alloy.

[0020] S20. The W-state 2XXX series aluminum alloy is pre-aged at a pre-aging temperature of 90-180℃ for 1-24 hours. After cooling, the PA-state 2XXX series aluminum alloy is obtained.

[0021] S30. Perform 0-8% pre-deformation on PA-state 2XXX series aluminum alloys to obtain pre-hardened 2XXX series aluminum alloys;

[0022] S40. Using a first aging temperature of 85-170℃, the pre-hardened 2XXX series aluminum alloy is subjected to a first-stage aging treatment for 1-60 minutes, and after cooling, a first-stage 2XXX series aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature.

[0023] S50. The first-stage 2XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 80-170℃ for 1-60 minutes, and then cooled to obtain the second-stage 2XXX series aluminum alloy; wherein the second aging temperature is lower than the first aging temperature.

[0024] More preferably, in step S20, a GP region is formed in the 2XXX series aluminum alloy under pre-aging treatment; the size of the GP region is 1 to 10 nm.

[0025] In step S40, a first-level main strengthening phase is formed in the first-level 2XXX series aluminum alloy. The first-level main strengthening phase is the θ' phase with a size of 5 to 10 nm.

[0026] In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level 2XXX series aluminum alloy; the second-level main strengthening phase is a θ' phase with a size of 10-25 nm, and the GPII region has a size of 1-10 nm.

[0027] Based on the above technical solutions, preferably, in S10, a solution treatment temperature of 504 to 579°C is used to treat the 6XXX series aluminum alloy, and after the solution treatment for 5 to 100 minutes, a water quenching treatment is performed to obtain the W-state 6XXX series aluminum alloy.

[0028] S20. Pre-aging treatment of W-state 6XXX series aluminum alloy is carried out at a pre-aging temperature of 90-170℃ for 1-24 hours. After cooling, PA-state 6XXX series aluminum alloy is obtained.

[0029] S30. Pre-deform 6XXX series aluminum alloys in PA state by 0-8% to obtain pre-hardened 6XXX series aluminum alloys.

[0030] S40. Using a first aging temperature of 85-160℃, the pre-hardened 6XXX series aluminum alloy is subjected to a first-stage aging treatment for 1-60 minutes, and after cooling, a first-stage 6XXX series aluminum alloy is obtained; wherein, the first aging temperature is less than or equal to the pre-aging temperature.

[0031] S50. The first-stage 6XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 80-160℃ for 1-60 minutes, and then cooled to obtain the second-stage 6XXX series aluminum alloy; wherein the second aging temperature is lower than the first aging temperature.

[0032] More preferably, in step S20, a GP region is formed in the 6XXX series aluminum alloy under pre-aging treatment; the size of the GP region is 1 to 10 nm.

[0033] In step S40, a first-level main strengthening phase is formed in the first-level 6XXX series aluminum alloy. The first-level main strengthening phase is a β” phase with a size of 5-10 nm.

[0034] In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level 6XXX series aluminum alloy; the second-level main strengthening phase is a β” phase with a size of 10-25 nm, and the GPII region has a size of 1-10 nm.

[0035] Based on the above technical solutions, preferably, in S10, a solution treatment temperature of 449-521℃ is used to treat the 7XXX series aluminum alloy, and water quenching is performed after the solution treatment for 5-100 minutes to obtain the W state 7XXX series aluminum alloy.

[0036] S20. The W-state 7XXX series aluminum alloy is pre-aged at a pre-aging temperature of 85-130℃ for 1-24 hours. After cooling, the PA-state 7XXX series aluminum alloy is obtained.

[0037] S30. Pre-deform 7XXX series aluminum alloys in PA state by 0-8% to obtain pre-hardened 7XXX series aluminum alloys;

[0038] S40. Using a first aging temperature of 80-120℃, the pre-hardened 7XXX series aluminum alloy is subjected to a first-stage aging treatment for 1-60 minutes, and after cooling, a first-stage 7XXX series aluminum alloy is obtained; wherein, the first aging temperature is less than or equal to the pre-aging temperature.

[0039] S50. The first-stage 7XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 70-110℃ for 1-60 minutes, and then cooled to obtain the second-stage 7XXX series aluminum alloy; wherein the second aging temperature is lower than the first aging temperature.

[0040] More preferably, in step S20, a GP region is formed in the 7XXX series aluminum alloy under pre-aging treatment; the size of the GP region is 1 to 10 nm.

[0041] In step S40, a first-level main strengthening phase is formed in the first-level 7XXX series aluminum alloy. The first-level main strengthening phase is the η' phase with a size of 5 to 10 nm.

[0042] In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level 7XXX series aluminum alloy; the second-level main strengthening phase is an η' phase with a size of 5 to 20 nm, and the GPII region has a size of 1 to 10 nm.

[0043] In the above scheme, pre-aging treatment of the W-state alloy can form GP regions with a size of 1-10 nm in the aluminum alloy. Pre-deformation treatment introduces more vacancies into the interior of the aluminum alloy, providing more nucleation sites and deformation energy for the strengthening phase, lowering the precipitation threshold of the main strengthening phase, and ensuring sufficient and small-sized precipitation of the strengthening phase during subsequent aging. Thus, while ensuring subsequent elongation, the strength of the aluminum alloy is initially improved. During the first-stage aging treatment, the GP regions dissolve and form the corresponding first-stage main strengthening phase. During the second-stage aging treatment, the aluminum alloy can continue to precipitate and form the second-stage main strengthening phase and GPII regions. During the aging treatment, because the main strengthening phase is bypassed by dislocations, cross-slip occurs, which has a softening effect; and because the nanoclusters are cut by dislocations, planar slip occurs, which has a hardening effect. The combined effect of cross-slip and planar slip improves the strain hardening capability of the aluminum alloy, enabling the aluminum alloy to reach the strength of the T6 state alloy.

[0044] The heat treatment method for synergistic strengthening of high-strength aluminum alloys by deformation and phase transformation provided by this invention has the following advantages over existing technologies:

[0045] 1. The method of pre-aging + pre-deformation + secondary aging for treating aluminum alloys significantly shortens the aging treatment time, reduces the hot working time of the aluminum alloys, and improves production efficiency. Simultaneously, the method provided in this disclosure enables synergistic strengthening of the aluminum alloys through deformation and phase transformation during the treatment process, thereby increasing the strength of the aluminum alloys.

[0046] 2. In this invention, the pre-aging temperature ≥ the first-stage aging temperature > the second-stage aging temperature, enabling the aluminum alloy to achieve mechanical properties close to those of a peak-aged aluminum alloy within a shorter aging time. Therefore, this invention proposes a heat treatment method for synergistic strengthening of high-strength aluminum alloys through deformation and phase transformation. This method reduces the duration of artificial aging by employing pre-aging, pre-deformation, and two-stage aging heat treatment processes, while simultaneously obtaining an aluminum alloy that reaches peak-aged T6 strength. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1

[0049] In this embodiment, 2219 aluminum alloy is subjected to aging treatment to obtain T6 state 2219 aluminum alloy.

[0050] S10. Place the 2219 aluminum alloy in a heat treatment furnace for solution treatment at a temperature of 488-554℃ for 40 minutes. After solution treatment, perform water quenching at a temperature of 25℃. The temperature change before and after cooling should not exceed 5℃, and the quenching transfer time should not exceed 25 seconds to obtain the W-state 2219 aluminum alloy.

[0051] The 2219 aluminum alloy composition by mass percentage includes 0.20% silicon, 0.3% iron, 5.8-6.8% copper, 0.20-0.40% manganese, 0.02% magnesium, 0.10% zinc, 0.02-0.10% titanium, 0.05-0.15% vanadium, 0.10-0.25% zirconium, 0.15% other components, and the balance being aluminum.

[0052] S20. After quenching, the W-state 2219 aluminum alloy is immediately placed in a pre-aging furnace for pre-aging treatment. The pre-aging temperature is 160℃ and the pre-aging time is 30min. Then it is cooled to room temperature to obtain the PA-state 2219 aluminum alloy.

[0053] S30. Perform 0% pre-deformation treatment on PA-state 2219 aluminum alloy.

[0054] S40. The 2219 aluminum alloy obtained in step S30 is subjected to a first-stage aging treatment at a temperature of 75°C for 30 minutes, and then cooled to room temperature to obtain the first-stage 2219 aluminum alloy.

[0055] S50. After the first stage of aging is completed, the first-stage 2219 aluminum alloy is subjected to a second stage of aging treatment. The second stage of aging temperature is 70℃ and the second stage of aging time is 30min. Then it is cooled to room temperature. The obtained second-stage 2219 aluminum alloy is defined as T6 state 2219 aluminum alloy 1.

[0056] Example 2

[0057] The difference between Example 2 and Example 1 is as follows: the pre-aging temperature is 160℃, and the pre-aging time is 30 min; the first-stage aging temperature is 75℃, and the first-stage aging time is 30 min; the second-stage aging temperature is 140℃, and the second-stage aging time is 30 min. The rest of the process is the same as in Example 1. The obtained second-stage 2219 aluminum alloy is defined as T6-state 2219 aluminum alloy 2.

[0058] The difference between Examples 3 to 27 and Example 1 lies in the pre-aging temperature, pre-deformation amount, first-stage aging temperature, and second-stage aging temperature. The rest of the process is the same as in Example 1. The resulting second-stage 2219 aluminum alloys are sequentially defined as T6-state 2219 aluminum alloy 3 to T6-state 2219 aluminum alloy 27. In Examples 10 to 27, the pre-deformation is 4% or 8%. By pre-hardening the PA-state 2219 aluminum alloy, more vacancies are introduced into the alloy, providing more nucleation sites and deformation energy for the strengthening phase, lowering the precipitation threshold of the main strengthening phase, and ensuring sufficient and small-sized precipitation of the strengthening phase in subsequent processes. Thus, while ensuring subsequent elongation, the strength of the aluminum alloy is initially improved. The temperature and time parameters for the aging treatment in each example are shown in Table 1.

[0059] As shown in Table 1, under the aging treatment parameters provided in Example 14, the tensile strength of the obtained T6-tempered 2219 aluminum alloy 14 can reach 455 MPa, and the yield strength can reach 365 MPa. Under the aging treatment parameters provided in Example 23, the tensile strength of the obtained T6-tempered 2219 aluminum alloy 23 can reach 454 MPa, and the yield strength can reach 363 MPa. Thus, when the pre-aging temperature > first-stage aging temperature > second-stage aging temperature is met, through pre-aging treatment, pre-deformation, and second-stage aging treatment, the aluminum alloy completes the synergistic strengthening of deformation and phase transformation. Under a shorter artificial aging time, the mechanical properties of the obtained T6-tempered 2219 aluminum alloy are close to those of peak-aged alloy.

[0060] Example 28

[0061] In this embodiment, 6061 aluminum alloy is subjected to aging treatment to obtain T6 state 6061 aluminum alloy.

[0062] S10. Place the 6061 aluminum alloy in a heat treatment furnace for solution treatment at a temperature of 504-579℃ for 30 minutes. After solution treatment, perform water quenching at a temperature of 25℃. The temperature change before and after cooling should not exceed 5℃, and the quenching transfer time should not exceed 25 seconds to obtain the W-state 6061 aluminum alloy.

[0063] The 6061 aluminum alloy composition by mass percentage includes silicon 0.40-0.8%, iron 0.7%, copper 0.15-0.4%, manganese 0.15%, magnesium 0.8-1.2%, chromium 0.04-0.35%, zinc 0.25%, titanium 0.15%, other components 0.15%, with the balance being aluminum.

[0064] S20. After quenching, the W-state 6061 aluminum alloy is immediately placed in a pre-aging furnace for pre-aging treatment. The pre-aging temperature is 150℃ and the pre-aging time is 30min. Then it is cooled to room temperature to obtain the PA-state 6061 aluminum alloy.

[0065] S30. Perform 0% pre-deformation treatment on PA state 6061 aluminum alloy.

[0066] S40. The 6061 aluminum alloy obtained in step S30 is subjected to a first-stage aging treatment at a temperature of 75°C for 30 minutes, and then cooled to room temperature to obtain the first-stage 6061 aluminum alloy.

[0067] S50. After the first stage of aging is completed, the first-stage 6061 aluminum alloy is subjected to a second stage of aging treatment. The second stage of aging temperature is 70℃ and the second stage of aging time is 30min. Then it is cooled to room temperature. The obtained second-stage 6061 aluminum alloy is defined as T6 state 6061 aluminum alloy 1.

[0068] Example 29

[0069] The difference between Example 29 and Example 28 is as follows: the pre-aging temperature is 150℃, and the pre-aging time is 30 min; the first-stage aging temperature is 75℃, and the first-stage aging time is 30 min; the second-stage aging temperature is 130℃, and the second-stage aging time is 30 min. The rest of the process is the same as in Example 28, and the resulting second-stage 6061 aluminum alloy is defined as T6-state 6061 aluminum alloy 2.

[0070] The difference between Examples 30 to 54 and Example 28 lies in the pre-aging temperature, pre-deformation amount, first-stage aging temperature, and second-stage aging temperature. The rest of the process is the same as in Example 28, and the resulting second-stage 6061 aluminum alloys are sequentially defined as T6-state 6061 aluminum alloy 3 to T6-state 6061 aluminum alloy 27. The temperature and time parameters for the aging treatment in each example are shown in Table 1.

[0071] As shown in Table 1, under the aging treatment parameters provided in Example 41, the tensile strength of the obtained T6-state 6061 aluminum alloy 14 can reach 430 MPa, and the yield strength can reach 350 MPa; under the aging treatment parameters provided in Example 50, the tensile strength of the obtained T6-state 6061 aluminum alloy 23 can reach 432 MPa, and the yield strength can reach 345 MPa. Thus, when the pre-aging temperature ≥ first-stage aging temperature > second-stage aging temperature is met, through pre-aging treatment, pre-deformation, and second-stage aging treatment, the aluminum alloy completes the synergistic strengthening of deformation and phase transformation, and under a shorter artificial aging time, the mechanical properties of the obtained T6-state 6061 aluminum alloy are close to those of peak-aged alloy.

[0072] Example 55

[0073] In this embodiment, 7075 aluminum alloy is subjected to aging treatment to obtain T6 state 7075 aluminum alloy.

[0074] S10. Place the 7075 aluminum alloy in a heat treatment furnace for solution treatment at a temperature of 449-521℃ for 30 minutes. After solution treatment, perform water quenching at a water temperature of 25℃. The water temperature change before and after cooling should not exceed 5℃, and the quenching transfer time should not exceed 25 seconds to obtain the W-state 7075 aluminum alloy.

[0075] The 7075 aluminum alloy composition by mass percentage includes silicon 0.4%, iron 0.5%, copper 1.2-2.0%, manganese 0.3%, magnesium 2.1-2.9%, chromium 0.18-0.28%, zinc 5.1-6.1%, titanium 0.2%, other 0.15%, with the balance being aluminum.

[0076] S20. After quenching, the W-state 7075 aluminum alloy is immediately placed in a pre-aging furnace for pre-aging treatment. The pre-aging temperature is 110℃ and the pre-aging time is 30min. Then it is cooled to room temperature to obtain the PA-state 7075 aluminum alloy.

[0077] S30. Perform 0% pre-deformation treatment on PA-state 7075 aluminum alloy.

[0078] S40. The 7075 aluminum alloy obtained in step S30 is subjected to a first-stage aging treatment at a temperature of 75°C for 30 minutes, and then cooled to room temperature to obtain the first-stage 7075 aluminum alloy.

[0079] S50. After the first stage of aging is completed, the first-stage 7075 aluminum alloy is subjected to a second stage of aging treatment. The second stage of aging temperature is 70℃ and the second stage of aging time is 30min. Then it is cooled to room temperature. The obtained second-stage 7075 aluminum alloy is defined as T6 state 7075 aluminum alloy 1.

[0080] Example 56

[0081] The difference between Example 56 and Example 55 is as follows: the pre-aging temperature is 110℃, and the pre-aging time is 30 min; the first-stage aging temperature is 75℃, and the first-stage aging time is 30 min; the second-stage aging temperature is 90℃, and the second-stage aging time is 30 min. The rest of the process is the same as in Example 55, and the obtained second-stage 7075 aluminum alloy is defined as T6-state 7075 aluminum alloy 2.

[0082] The difference between Examples 57-81 and Example 55 lies in the pre-aging temperature, pre-deformation amount, first-stage aging temperature, and second-stage aging temperature. The rest of the process is the same as in Example 55, and the resulting second-stage 7075 aluminum alloys are sequentially defined as T6-state 7075 aluminum alloy 3 to T6-state 7075 aluminum alloy 27. In Examples 64-81, the pre-deformation is 4% or 8%. By pre-deforming the PA-state 7075 aluminum alloy, more vacancies are introduced into the alloy, providing more nucleation sites and deformation energy storage for the strengthening phase, lowering the precipitation threshold of the main strengthening phase, and ensuring sufficient and small-sized precipitation of the strengthening phase during subsequent aging. The temperature and time parameters for the aging treatment in each example are shown in Table 1.

[0083] As shown in Table 1, under the aging treatment parameters provided in Example 68, the tensile strength of the obtained T6-state 7075 aluminum alloy 14 can reach 615 MPa, and the yield strength can reach 510 MPa; under the aging treatment parameters provided in Example 77, the tensile strength of the obtained T6-state 7075 aluminum alloy 23 can reach 611 MPa, and the yield strength can reach 505 MPa. Thus, when the pre-aging temperature ≥ first-stage aging temperature > second-stage aging temperature is met, through pre-aging treatment, pre-deformation, and second-stage aging treatment, the aluminum alloy completes the synergistic strengthening of deformation and phase transformation, and the mechanical properties of the obtained T6-state 7075 aluminum alloy are close to those of peak-aged aluminum alloys under relatively short artificial aging conditions.

[0084] Table 1. Summary of different aging treatments for aluminum alloys of different materials

[0085]

[0086]

[0087]

[0088] It should be noted that although the steps of the heat treatment method for synergistic strengthening of high-strength aluminum alloys by deformation and phase transformation in this disclosure are described in a specific order in the specification, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat treatment method for synergistic strengthening of 2XXX series high-strength aluminum alloys by deformation and phase transformation, characterized in that, Includes the following steps: S10. At the solution treatment temperature, the aluminum alloy is subjected to solution treatment, and then quenched to obtain the W-state aluminum alloy. S20. At the pre-aging temperature, the W-state aluminum alloy is pre-aged and then cooled to obtain the PA-state aluminum alloy. S30. Perform 4-8% pre-deformation on PA state aluminum alloy to obtain pre-hardened aluminum alloy; S40. At the first aging temperature, the pre-hardened aluminum alloy is subjected to the first-stage aging treatment for 30 minutes, and after cooling, the first-stage aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature; S50. At the second aging temperature, the first-grade aluminum alloy is subjected to a second-stage aging treatment for 30 minutes, and after cooling, the second-grade aluminum alloy is obtained; wherein, the second aging temperature is lower than the first aging temperature; It also includes: S101, using a solution treatment temperature of 488~554℃ to perform solution treatment on 2XXX series aluminum alloys, followed by water quenching after 40 minutes of solution treatment to obtain W-state 2XXX series aluminum alloys; S201. The W-state 2XXX series aluminum alloy was pre-aged at a pre-aging temperature of 160℃ for 30 minutes. After cooling, the PA-state 2XXX series aluminum alloy was obtained. S301. Perform 4-8% pre-deformation on PA-state 2XXX series aluminum alloys to obtain pre-hardened 2XXX series aluminum alloys; S401. Using a first aging temperature of 85~150℃, the pre-hardened 2XXX series aluminum alloy is subjected to a first-stage aging treatment for 30 minutes, and after cooling, a first-stage 2XXX series aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature. S501. The first-stage 2XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 80~140℃ for 30 minutes, and then cooled to obtain the second-stage 2XXX series aluminum alloy; wherein, the second aging temperature is lower than the first aging temperature.

2. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 1, characterized in that, In step S10, the quenching treatment is a water quenching treatment; The water temperature used in the water quenching treatment is 20~25℃; Before and after water quenching, the water temperature change should be less than or equal to 5℃, and the water quenching transfer time should not exceed 25 seconds.

3. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 1, characterized in that, In steps S20, S40 and S50, the cooling is performed at a temperature of 15~25°C.

4. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 1, characterized in that, In step S20, a GP region is formed in the pre-aging aluminum alloy; In step S40, a first-level main strengthening phase is formed in the first-level aluminum alloy; In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level aluminum alloy.

5. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 1, characterized in that, In step S201, a GP region is formed in the 2XXX series aluminum alloy during the pre-aging treatment; the size of the GP region is 1~10nm; In step S401, a first-level main strengthening phase is formed in the first-level 2XXX series aluminum alloy. The first-level main strengthening phase is the θ' phase with a size of 5~10nm. In step S501, a second-level main strengthening phase and a GPII region are formed in the second-level 2XXX series aluminum alloy; the second-level main strengthening phase is a θ' phase with a size of 10~25nm, and the GPII region has a size of 1~10nm.

6. A heat treatment method for synergistic strengthening of 6XXX series high-strength aluminum alloys by deformation and phase transformation, characterized in that, Includes the following steps: S10. At the solution treatment temperature, the aluminum alloy is subjected to solution treatment, and then quenched to obtain the W-state aluminum alloy. S20. At the pre-aging temperature, the W-state aluminum alloy is pre-aged and then cooled to obtain the PA-state aluminum alloy. S30. Perform 4-8% pre-deformation on PA state aluminum alloy to obtain pre-hardened aluminum alloy; S40. At the first aging temperature, the pre-hardened aluminum alloy is subjected to the first-stage aging treatment for 30 minutes, and after cooling, the first-stage aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature; S50. At the second aging temperature, the first-grade aluminum alloy is subjected to a second-stage aging treatment for 30 minutes, and after cooling, the second-grade aluminum alloy is obtained; wherein, the second aging temperature is lower than the first aging temperature; It also includes: S102, using a solution treatment temperature of 504~579℃ to perform solution treatment on 6XXX series aluminum alloys, followed by water quenching after 30 minutes of solution treatment to obtain W-state 6XXX series aluminum alloys; S202. The W-tempered 6XXX series aluminum alloy was pre-aged at a pre-aging temperature of 150℃ for 30 minutes. After cooling, the PA-tempered 6XXX series aluminum alloy was obtained. S302. Pre-deform 6XXX series aluminum alloys in PA state by 4-8% to obtain pre-hardened 6XXX series aluminum alloys. S402. Using a first aging temperature of 85~140℃, the pre-hardened 6XXX series aluminum alloy is subjected to the first stage of aging treatment for 30 minutes, and after cooling, the first stage 6XXX series aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature. S502. The first-stage 6XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 80~130℃ for 30 minutes, and then cooled to obtain the second-stage 6XXX series aluminum alloy; wherein, the second aging temperature is lower than the first aging temperature.

7. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 6, characterized in that, In step S10, the quenching treatment is a water quenching treatment; The water temperature used in the water quenching treatment is 20~25℃; Before and after water quenching, the water temperature change should be less than or equal to 5℃, and the water quenching transfer time should not exceed 25 seconds.

8. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 6, characterized in that, In steps S20, S40 and S50, the cooling is performed at a temperature of 15~25°C.

9. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 6, characterized in that, In step S20, a GP region is formed in the pre-aging aluminum alloy; In step S40, a first-level main strengthening phase is formed in the first-level aluminum alloy; In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level aluminum alloy.

10. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 6, characterized in that, In step S202, a GP region is formed in the 6XXX series aluminum alloy during the pre-aging treatment; the size of the GP region is 1~10nm; In step S402, a first-level main strengthening phase is formed in the first-level 6XXX series aluminum alloy. The first-level main strengthening phase is a β'' phase with a size of 5~10nm. In step S502, a second-level main strengthening phase and a GPII region are formed in the second-level 6XXX series aluminum alloy; the second-level main strengthening phase is a β'' phase with a size of 10~25nm, and the GPII region has a size of 1~10nm.

11. A heat treatment method for synergistic strengthening of 7XXX series high-strength aluminum alloys by deformation and phase transformation, characterized in that, Includes the following steps: S10. At the solution treatment temperature, the aluminum alloy is subjected to solution treatment, and then quenched to obtain the W-state aluminum alloy. S20. At the pre-aging temperature, the W-state aluminum alloy is pre-aged and then cooled to obtain the PA-state aluminum alloy. S30. Perform 4-8% pre-deformation on PA state aluminum alloy to obtain pre-hardened aluminum alloy; S40. At the first aging temperature, the pre-hardened aluminum alloy is subjected to the first-stage aging treatment for 30 minutes, and after cooling, the first-stage aluminum alloy is obtained; wherein, the first aging temperature is lower than the pre-aging temperature; S50. At the second aging temperature, the first-grade aluminum alloy is subjected to a second-stage aging treatment for 30 minutes, and after cooling, the second-grade aluminum alloy is obtained; wherein, the second aging temperature is lower than the first aging temperature; It also includes: S103, using a solution treatment temperature of 449~521℃ to perform solution treatment on 7XXX series aluminum alloys, followed by water quenching after 30 minutes of solution treatment to obtain W-state 7XXX series aluminum alloys; S203. The W-state 7XXX series aluminum alloy was pre-aged at a pre-aging temperature of 110℃ for 30 minutes. After cooling, the PA-state 7XXX series aluminum alloy was obtained. S303. Pre-deform 7XXX series aluminum alloys in PA state by 4-8% to obtain pre-hardened 7XXX series aluminum alloys. S403. The pre-hardened 7XXX series aluminum alloy is subjected to the first stage of aging treatment for 30 minutes at a first aging temperature of 80~100℃, and the first stage of 7XXX series aluminum alloy is obtained after cooling; wherein, the first aging temperature is lower than the pre-aging temperature. S503. The first-stage 7XXX series aluminum alloy is subjected to a second-stage aging treatment at a second aging temperature of 70~90℃ for 30 minutes, and then cooled to obtain the second-stage 7XXX series aluminum alloy; wherein, the second aging temperature is lower than the first aging temperature.

12. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 11, characterized in that, In step S10, the quenching treatment is a water quenching treatment; The water temperature used in the water quenching treatment is 20~25℃; Before and after water quenching, the water temperature change should be less than or equal to 5℃, and the water quenching transfer time should not exceed 25 seconds.

13. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 11, characterized in that, In steps S20, S40 and S50, the cooling is performed at a temperature of 15~25°C.

14. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 11, characterized in that, In step S20, a GP region is formed in the pre-aging aluminum alloy; In step S40, a first-level main strengthening phase is formed in the first-level aluminum alloy; In step S50, a second-level main strengthening phase and a GPII region are formed in the second-level aluminum alloy.

15. The heat treatment method for synergistic strengthening of high-strength aluminum alloy by deformation and phase transformation according to claim 11, characterized in that, In step S203, a GP region is formed in the 7XXX series aluminum alloy during the pre-aging treatment; the size of the GP region is 1~10nm; In step S403, a first-level main strengthening phase is formed in the first-level 7XXX series aluminum alloy. The first-level main strengthening phase is the η' phase with a size of 5~10nm. In step S503, a second-level main strengthening phase and a GPII region are formed in the second-level 7XXX series aluminum alloy; the second-level main strengthening phase is an η' phase with a size of 5~20nm, and the GPII region has a size of 1~10nm.

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