Twinning, grain orientation, and texture variations in Mg alloy processed by pre-rolling

• Published in: Progress in natural science Vol. 29; no. 2; pp. 231 - 236
• Main Authors: Yang, Qingshan, Dai, Qingwei, Lou, Chao, Dai, Jiahong, Zhang, Jianyue, Jiang, Bin, Pan, Fusheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2019; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China%School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China%National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing,Jiaotong University, Chongqing 400074, China%College of Materials Science and Engineering, Yangtze Normal University, Chongqing, 408100, China%School of Engineering Technology, Purdue University, West Lafayette, IN, 47907-2021, United States%National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China
• Subjects: Grain orientation; Mg alloy; Texture; Twin; Grain orientation; Mg alloy; Texture; Twin
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2019.03.008

A pre-rolling (PR) process with a small pre-strain was applied along the transverse direction (TD) and the extrusion direction (ED) of non-basal and basal textured AZ61 Mg alloys at room temperature to investigate the induced twinning behavior. The microstructural evolution of the alloys was used to evaluate the grain-boundary effect in terms of the texture variation. The results demonstrated that {101¯2} extension twinning was introduced by the PR process and that the volume fraction of twins increased with increasing thickness reduction. The subdivision of grains via twinning induced grain reorientation that generated a prominent basal texture with the c-axis parallel to the normal direction (ND) after PR. The textured Mg alloy with this c-axis//TD feature can promote twinning activity. The twinning performance was critical to initiate plastic deformation, therefore to determine deformation behavior at room temperature. The deformation mechanism was also addressed related to the extension twin lamellae. [Display omitted] •Pre-rolling was processed to investigate the induced twinning behavior.•The texture with this c-axis//TD feature can promote twinning activity.•Basal texture with the c-axis oriented to the ND processed by PR.•Twins can control basal texture based on volume fraction of twinned region.