Orientation factor analysis of deformation mechanisms under special processing techniques in AZ31 magnesium alloys

作     者：Ping YANG Lina WANG Xiao LI Li MENU 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Material Department School of Tianjin University of Science and Technology Beijing Tianjin 301830 China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2010年第23卷第1期

页      面：63-71页

核心收录：

学科分类：07[理学] 08[工学] 070205[理学-凝聚态物理] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0807[工学-动力工程及工程热物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 0702[理学-物理学] 

基　　金：support from the National Natural Science Foundation of China(Nos50571009 and 50771019) 

主　　题：Magnesium Asymmetrical rolling Equal channel angular pressing Equal channel angular rolling Deformation 

摘      要：Experiments show that special processing techniques such as asymmetrical rolling （ASR）, equal channel angular pressing （ECAP） and equal channel angular rolling （ECAR） can weaken the basal texture of the magnesium alloys and therefore improve their plasticity. However, the deformation mechanisms related are different. In this paper, we determine the deformation mechanisms activated during ASR, ECAP and ECAR by calculation of orientation factors. Analysis shows that during ASR the shear stress σ13 on the rolling plane of the samples obviously weakens the basal slip and tension twinning that all produce basal texture and improve plasticity due to the promotion of tilt basal texture. During ECAP the shear stress σs on the intersecting plane of two channels promotes tension twinning in the basal oriented grains, whereas under ECAR the shear stress σ13 induced by roller friction on the rolling plane produces the shear stress as on the intersection plane of the two channels that also promotes tension twinning. Although the shear strain is lower in ECAR than in ECAP, the channel clearance in ECAR facilitates tension twinning.