不同模具角度下反复弯曲-压平变形工艺对AZ31镁合金板材显微组织演变和变形行为的影响  

Microstructure evolution and deformation behaviors of AZ31 Mg alloy sheets processed by repeated bending−flattening deformation with different die angles

作　　者：李旻昊 卢立伟[1,2,3] 范宇田 马旻 吴志强 周涛 齐福刚[5] 张华 Min-hao LI;Li-wei LU;Yu-tian FAN;Min MA;Zhi-qiang WU;Tao ZHOU;Fu-gang QI;Hua ZHANG(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key laboratory of High Efficiency and Precision Machining of Difficult-to-cut Material,Hunan University of Science and Technology,Xiangtan 411201,China;School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,China;Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China)

机构地区：[1]湖南科技大学机电工程学院,湘潭411201 [2]湖南科技大学难加工材料高效精密加工湖南省重点实验室,湘潭411201 [3]湖南科技大学材料科学与工程学院,湘潭411201 [4]重庆理工大学材料科学与工程学院,重庆400054 [5]湘潭大学材料科学与工程学院,湘潭411105 [6]烟台大学精准材料高等研究院,烟台264005

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第3期812-832,共21页中国有色金属学报（英文版）

基　　金：partly supported by the National Natural Science Foundation of China (Nos. 52174362, 51975207);the Xiangtan Special Project for Building a National Innovative City,China (No. CG-YB20221043);the Yancheng “Talent Plan of Yellow Sea Pearl” for Leading Talent Project,China。

摘　　要：采用不同角度模具的反复弯曲-压平变形工艺制备AZ31镁合金板材。通过FEM、OM、EBSD和硬度计研究AZ31镁合金在反复弯曲-压平变形过程中的显微组织演变和变形行为。结果表明,150°/150°模具在所有三组实验中都表现出最佳性能。随着道次的增加,合金的等效应变由于剪切和弯曲作用而显著提高。经过4道次后,合金的平均晶粒尺寸显著细化至1.7μm,基面织构被弱化,这是非基面滑移、动态再结晶和孪生引起的;尤其是锥面滑移有利于引发动态再结晶和孪生。合金的硬度值达到HV 77,这是滑移、孪生和动态再结晶竞争产生的显微组织和织构综合作用的结果。AZ31 magnesium alloy sheets were fabricated by repeated bending-flattening deformation(RBFD)using dies of various angles.The microstructure evolution and deformation behaviors of the AZ31 Mg alloy during RBFD were investigated by FEM,OM,EBSD and hardness tester.The results suggest that the 150°/150°die exhibits the superior performance across all three groups.With an increase in passes,the effective strain of the alloy is significantly improved due to the positive impact of shear and bending.After four passes,the average grain size can be significantly refined to 1.7μm,and a weaker basal texture can be obtained compared to the initial one due to non-basal slips,dynamic recrystallization(DRX),and twinning.Particularly,the pyramidalác+añslip promotes DRX and twinning.The hardness of the alloy reaches HV 77 as a result of the comprehensive effect of microstructure and texture generated by slip,twinning and DRX competition.

关 键 词：AZ31镁合金板材 显微组织演变 变形行为 反复弯曲-压平工艺 模具角度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]