CN-122013078-A - Method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging and aluminum and/or magnesium alloy finished product

Abstract

The application provides a method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging and an aluminum and/or magnesium alloy finished product. The method comprises the steps of S1, carrying out solid solution treatment on aluminum and/or magnesium alloy to be treated, S2, carrying out laser shot blasting on the aluminum and/or magnesium alloy subjected to the solid solution treatment, and S3, carrying out peak aging treatment on the aluminum and/or magnesium alloy subjected to the laser shot blasting. According to the application, the solution treatment can dissolve the initial nano precipitated phase to form a single-phase supersaturated solid solution, the laser shot blasting treatment can effectively promote dislocation pinning, so that more and more stable gradient dislocation structures are reserved in the subsequent peak aging process of aluminum and/or magnesium alloy, power is provided for nucleation and growth of the nano precipitated phase, and a continuous transition structure of a surface overaging state-a core peak aging state is constructed in combination with the subsequent peak aging treatment, and the continuous transition structure endows the aluminum and/or magnesium alloy with corrosion fatigue resistance and high strength characteristics.

Inventors

• LUO SIHAI
• ZHU DONGFAN
• HE WEIFENG
• ZHOU GUANGNI
• NIE XIANGFAN
• LIANG XIAOQING

Assignees

• 中国人民解放军空军工程大学

Dates

Publication Date

20260512

Application Date

20260310

Claims (10)

1. 1. A method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging, which is characterized by comprising the following steps: s1, carrying out solution treatment on aluminum and/or magnesium alloy to be treated; S2, carrying out laser shot blasting treatment on the aluminum and/or magnesium alloy subjected to the solution treatment; S3, carrying out peak aging treatment on the aluminum and/or magnesium alloy subjected to laser shot blasting treatment.
2. 2. The method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by laser peening combined with peak aging according to claim 1, wherein in step S1, the aluminum alloy is selected from at least one of Al-Mg-Cu-based aluminum alloy, al-Mg-Si-based aluminum alloy, and Al-Zn-Mg-Cu-based aluminum alloy.
3. 3. The method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by laser peening combined with peak aging according to claim 1, wherein in step S1, the magnesium alloy is at least one selected from Mg-Al magnesium alloy, mg-Zn magnesium alloy and Mg-RE magnesium alloy.
4. 4. The method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by laser peening combined with peak aging according to claim 1, wherein in step S1, the solution treatment comprises heating to 400-550 ℃ at a rate of 1-10 ℃ per minute, and maintaining the temperature for 0.5-10h, and cooling.
5. 5. The method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by laser peening combined with peak aging according to claim 1, wherein in step S2, the laser peening is laser peening with an absorbing protective layer or laser peening without an absorbing protective layer; and/or in the step S3, the peak aging treatment comprises the steps of heating to 100-250 ℃ at the speed of 1-10 ℃ per minute, preserving heat for 5-30h, and cooling.
6. 6. The method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by laser peening combined with peak aging according to claim 5, wherein in step S2, if the laser peening is laser peening with an absorption protection layer, the laser energy distribution is gaussian distribution or flat-top distribution, the overlap ratio is 25% -75%, the pulse width is 18-20ns, the wavelength of the laser beam is 1000-1100nm, the laser power density is 2-8GW/cm 2 , and the number of impacts is 1-5 times; If the laser shot blasting treatment mode is laser shot blasting treatment without an absorption protection layer, in the laser shot blasting treatment process, the laser energy distribution mode is Gaussian distribution or flat-top distribution, the lap joint rate is 25% -75%, the pulse width is 7-10ns, the wavelength of a laser beam is 500-550nm, the laser power density is 5-18GW/cm 2 , and the impact times are 1-5 times.
7. 7. An aluminum and/or magnesium alloy finished product obtained by the treatment of the method of any one of claims 1-6.
8. 8. The finished aluminum and/or magnesium alloy product of claim 7, wherein the finished aluminum and/or magnesium alloy product has a continuous transition structure with a surface layer predominantly of semi-coherent η and T phases and a core predominantly of coherent η' phases and clusters.
9. 9. The finished aluminum and/or magnesium alloy according to claim 8, wherein the T phase is 55% -60% by volume in the surface layer.
10. 10. The finished aluminum and/or magnesium alloy product according to claim 8 or 9, wherein the η phase in the surface layer has a close-packed hexagonal structure.

Description

Method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging and aluminum and/or magnesium alloy finished product Technical Field The application relates to the technical field of alloys, in particular to a method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging and an aluminum and/or magnesium alloy finished product. Background Both high strength aluminum alloys and magnesium alloys are typical age-strengthened alloys, with the high strength being primarily due to secondary phase strengthening that precipitates during aging. The high-strength aluminum alloy and the magnesium alloy have excellent specific strength and are widely applied to large-scale bearing equipment such as automobiles, airplanes and the like. However, during actual service, structural members made of high strength aluminum alloys and magnesium alloys are often subjected to both corrosive media and alternating loads. The introduction of the second phase can form a micro-couple between the alloy matrix and the nano precipitated phase, so that the corrosion resistance of the material is reduced, and the fatigue damage in a corrosion environment is further aggravated. Therefore, improving fatigue resistance of high-strength aluminum alloy and magnesium alloy in a corrosive environment is a key technical problem to be solved in the current engineering. The nano-precipitates are a critical factor in determining the performance of high strength alloys. The heat treatment has a decisive influence on the morphology and properties of the nano precipitated phases in the alloy. Taking 7075 aluminum alloy as an example, the peak aging state is mainly a metastable state coherent eta' nano precipitated phase, and the alloy has excellent strengthening effect, high strength and poor corrosion resistance. In contrast, in the overaging state, mainly semi-coherent steady state eta and T phases exist, the strength of which is lower than that of the peak aging state, but the corrosion resistance and the hydrogen embrittlement resistance of which are obviously improved. In order to achieve both strength and durability, two strategies are generally employed, overaging in combination with surface strengthening or peak aging in combination with anodic oxidation. The method can relieve corrosion fatigue to a certain extent, but the method can reduce the strength of the alloy, and the method can maintain the strength of the material, but the anodic oxide film is easy to become a crack initiation source under cyclic load, so that the fatigue life is reduced. Obviously, the prior art cannot simultaneously consider the high strength and corrosion fatigue resistance of the alloy. In the related art, in order to improve the corrosion fatigue resistance of high-strength aluminum alloy and magnesium alloy, CN108149172B proposes a processing method of a fine-grain cubic texture corrosion fatigue resistance aluminum alloy plate, which sequentially carries out solution treatment, cold rolling, cryogenic treatment and re-solution treatment on a 2E12 aluminum alloy plate to induce the material to recrystallize, reduce dislocation density and improve the corrosion fatigue resistance. However, the method is difficult to effectively inhibit anodic dissolution behavior of nano precipitated phases, and the improvement range of corrosion fatigue resistance is limited. Disclosure of Invention The application provides a method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging and an aluminum and/or magnesium alloy finished product, so as to solve the technical problems. In order to achieve the above purpose, the technical scheme of the application is as follows: the application provides a method for improving corrosion fatigue performance of aluminum and/or magnesium alloy by combining laser shot blasting with peak aging, which comprises the following steps: s1, carrying out solution treatment on aluminum and/or magnesium alloy to be treated; S2, carrying out laser shot blasting treatment on the aluminum and/or magnesium alloy subjected to the solution treatment; S3, carrying out peak aging treatment on the aluminum and/or magnesium alloy subjected to laser shot blasting treatment. In an embodiment of the present application, in step S1, the aluminum alloy is at least one selected from the group consisting of Al-Mg-Cu-based aluminum alloy (i.e., 2 xxx-based aluminum alloy), al-Mg-Si-based aluminum alloy (i.e., 6 xxx-based aluminum alloy), and Al-Zn-Mg-Cu-based aluminum alloy (i.e., 7 xxx-based aluminum alloy). In an embodiment of the present application, in step S1, the magnesium alloy is at least one selected from Mg-Al magnesium alloy, mg-Zn magnesium alloy and Mg-RE magnesium alloy. In one embodiment of the present application, in step S1, the solution t