The effect of basal <a> dislocation on { 11(2)1 } twin boundary evolution in a Mg-Gd-Y-Zr alloy

Huan Zhang ¹Yangxin Li ¹Yuxuan Liu ¹Qingchun Zhu ¹Xixi Qi ¹Gaoming Zhu ¹Jinhui Wang ²Peipeng Jin ²Xiaoqin Zeng³

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作者信息

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
3. 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;Qinghai Provincial Engineering Research Center for High Performance Light Metal Alloys and Forming,Qinghai University,Xining,810016,PR China
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Abstract

This study aims to understand the features of { 11(2)1 } twin boundaries in a high strain rate compressed Mg-10Gd-3Y-0.4Zr using electron backscatter diffraction (EBSD) and transmission electron microscopy(TEM).Based on the Schmid factor calculations,the basal <a>-dislocations are easily activated within the { 11(2)1 } twin and suppressed in the surrounding matrix.The consequent basal <a> dislocation-twin interaction during deformation can lead to the misorentiation deviation of { 11(2)1 } twin boundaries,accompanying with the formation of a step at the twin boundary.Such a { 11(2)1 } twin boundary evolution mechanism provides a new vision of twinning behavior in Mg alloys.

Key words

Mg alloys/Plastic deformation/Twinning/Dislocation/Misorientation

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基金项目

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量33

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