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Deformation Behavior and Microstructure Evolution of AZ31 Mg Alloy by Forging-Bending Repeated Deformation with Multi-pass Lowered Temperature

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金属学报:英文版 2023年第8期36卷 1317-1335页

作者： Minhao Li Liwei Lu Yuhui Wei Min Ma Weiying Huang School of Mechanical Engineering Hunan University of Science and TechnologyXiangtan411201China Hunan Jinfeng Mechanical Technology Co. Ltd.Loudi417700China School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan411201China Jiangsu Dayang Precision Forging Co. Ltd.Yancheng224000China Key Laboratory of Efficient and Clean Energy Utilization School of Energy and Power EngineeringChangsha University of Science and TechnologyChangsha410114China

In this study, AZ31 Mg alloy was processed by a new severe plasticity deformation methodology with multi-pass lowered temperature, and the deformation behavior and microstructure evolution were investigated by finite element method and electron back-scattered diffraction technique and hardness. The results show that with the increase of deformation pass, the strain gradually springs, and its interval distribution tends to homogenize. Meanwhile, the effective strain increases dramatically with the shear force sudden upgrade in the deformation process. Moreover, the new deformation technique can refine grain size remarkably. With the passes on, {10-12} tensile twins behavior and the pyramidal slip are triggered more frequently, leading to the completeness of dynamic recrystallization (DRX) gradually, which weaken and disperse the basal texture obviously. Besides, the standard deviation of hardness is getting smaller, and the maximum can reach 78.40 HV on average, which can be attributed to the even large strain distribution, complete DRX, and the high geometrically necessary dislocation.

关键词： AZ31 magnesium alloy sheet Forging-bending repeated deformation-Characterization Microstructure evolution deformationbehavior

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