The effect of basal dislocation on {11■1} twin boundary evolution in a Mg-Gd-Y-Zr alloy  

作　　者：Huan Zhang Yangxin Li Yuxuan Liu Qingchun Zhu Xixi Qi Gaoming Zhu Jinhui Wang Peipeng Jin Xiaoqin Zeng 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite,Shanghai Jiao Tong University,Shanghai,200240,PR China [2]Qinghai Provincial Engineering Research Center for High Performance Light Metal Alloys and Forming,Qinghai University,Xining,810016,PR China

出　　处：《Journal of Materials Science & Technology》2021年第22期212-218,共7页材料科学技术（英文版）

基　　金：This work was financially supported by National Natural Science Foundation of China(No.51701121,No.51825101,No.51631006);Shanghai Sailing Program(No.17YF1408800);Science and Technology Commission of Shanghai Municipality(No.18511109302);Qinghai Provincial Science and Technology Key Program(No.2018-GX-A1);Startup Fund for Youngman Research at SJTU(No.18×100040022)。

摘　　要：This study aims to understand the features of{11■1}twin boundaries in a high strain rate compressed Mg-10 Gd-3Y-0.4Zr using electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).Based on the Schmid factor calculations,the basal dislocations are easily activated within the{11■1}twin and suppressed in the surrounding matrix.The consequent basal dislocation-twin interaction during deformation can lead to the misorentiation deviation of{11■1}twin boundaries,accompanying with the formation of a step at the twin boundary.Such a{11■1}twin boundary evolution mechanism provides a new vision of twinning behavior in Mg alloys.

关 键 词：Mg alloys Plastic deformation TWINNING DISLOCATION MISORIENTATION 

分 类 号：TG146.22[一般工业技术—材料科学与工程]