Atomic-resolution investigations on formation and evolution of symmetric tilt grain boundaries near the {101¯2} twin orientation in a Mg alloy

Formation and evolution of symmetric tilt grain-boundaries (STGBs) near the {101¯2} twin orientation in a Mg alloy were studied with atomic-resolution. The STGBs could be formed by reactions of {101¯2} twin boundaries with 60° basal dislocations (referred to as 〈a60〉) coming respectively from the tw...

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Bibliographic Details
Published in:Scripta materialia 2020-10, Vol.187, p.113-118
Main Authors: Su, Huhu, Zhou, Xinzhe, Zheng, Shijian, Wu, Di, Chen, Rongshi, Ye, Hengqiang, Yang, Zhiqing
Format: Article
Language:English
Subjects:
Dislocation
Grain boundary
Mg alloy
Plastic deformation
Twinning
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Summary:Formation and evolution of symmetric tilt grain-boundaries (STGBs) near the {101¯2} twin orientation in a Mg alloy were studied with atomic-resolution. The STGBs could be formed by reactions of {101¯2} twin boundaries with 60° basal dislocations (referred to as 〈a60〉) coming respectively from the twin and matrix, with each pair of 〈a60〉 forming a grain-boundary dislocation (GBD). Incident 〈a60〉 dislocations reacted with GBDs, consequently activating emission of twinning dislocations which resulted in migration of the STGBs. Interestingly, STGBs could be transformed into {101¯2} twin boundaries by either grain-boundary sliding or reacting with an array of basal 〈a60〉 dislocations. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.06.005