Influence of solution treatment and aging on mechanical properties and microstructure of rare earth aluminum alloy

doi:10.13251/j.issn.0254-6051.2024.05.032

Abstract

Abstract: Solution treatment and aging process (solution treating at 480 ℃ for different time, water cooling, and aging at 120 ℃ for 24 h) of four thicknesses of rare earth aluminum alloy plates were studied, room temperature tensile tests were conducted on the alloy before and after heat treatment. The microstructure was qualitatively and quantitatively studied through EBSD, and the tensile fracture morphology was observed and analyzed. The results show that the solution treatment and aging process has a significant effect on improving the strength of rare earth aluminum alloy, with the most significant strengthening effect on the plate with thickness of 3.0 mm, in addition, it has a certain improvement effect on the plasticity of the alloy. After solution treatment and aging, the alloy with a thickness of 3.0 mm has stronger anisotropy compared to the alloy with a thickness of 1.2 mm, with more high and low angle grain boundaries, increased total length of grain boundaries, and smaller average grain size. Solution treatment and aging has a good effect on fine grain strengthening and dislocation strengthening of the rare earth aluminum alloy. The fracture mode of the rare earth aluminum alloy before heat treatment is ductile fracture, and the alloy with a thickness of 3.0 mm shows better plasticity than the 1.2 mm thick alloy. After solution treatment and aging, the fracture morphology of the 1.2 mm thick alloy specimen changes, and the plasticity further improves, while the plasticity of the 3.0 mm thick alloy decreases compared to that before heat treatment.

Key words: rare earth aluminum alloy, solution treatment and aging, room temperature tension, microstructure

CLC Number:

TG146

Liu Zizhi, Sun Fuzhen, Li Xiaoxu, Li Huiyu, Zhang Quanda, Mu Xuesong, Zhao Yan. Influence of solution treatment and aging on mechanical properties and microstructure of rare earth aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(5): 193-198.

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