Effect of intermediate annealing on microstructure, mechanical properties and Luders band evolution of 5182-O aluminum alloy

doi:10.13251/j.issn.0254-6051.2024.12.035

Abstract

Abstract: Microstructure, forming property, mechanical properties and Luders band evolution of the 5182-O aluminum alloy materials were characterized by SEM, topometer and universal tensile testing machine. The results show that after intermediate annealing treatment, the content of the second phase in the sheet decreases, the grain size increases from 19 μm to 34 μm, the material strength slightly decreases (R_m=273 MPa, R_p0.2=121 MPa), the elongation slightly increases (A₅₀=27.8%), the yield point elongation (YPE) is eliminated, and the Luders band on the surface of the punched parts is significantly improved. The intermediate annealing process can effectively improve the Luders band while ensuring the mechanical properties and formability of the 5182-O aluminum alloy used for automotive panel coverings. The significant improvement in the Luders band is mainly attributed to a more matched grain size and less bulk Al₆(FeMn) second phases, which weakens the PLC effect during plastic deformation. At present, the board prepared by this process has been applied to the production of automotive interior panel in some domestic OEMs.

Key words: 5182-O aluminum alloy, Luders band, mechanical properties, microstructure, PLC effect

CLC Number:

TG146.2

Wu Wandong, Meng Shuang, Yu Junpeng, Xu Zhiyuan, Wang Lei, Liu Bing, Ma Huilin, Li Yancheng. Effect of intermediate annealing on microstructure, mechanical properties and Luders band evolution of 5182-O aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(12): 213-220.

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