Atomic-resolution investigations on formation and evolution of symmetric tilt grain boundaries near the {101¯2} twin orientation in a Mg alloy. (October 2020)

• Record Type: Journal Article
• Authors: Su, Huhu; Zhou, Xinzhe; Zheng, Shijian; Wu, Di; Chen, Rongshi; Ye, Hengqiang; Yang, Zhiqing
• Is Part Of: Scripta materialia. Number 187(2020)
• Page Start: 113
• Page End: 118
• Publication Date: 2020-10
• Subjects: Mg alloy -- Dislocation -- Grain boundary -- Twinning -- Plastic deformation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.06.005
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Formation and evolution of symmetric tilt grain-boundaries (STGBs) near the { 10 1 ¯ 2 } twin orientation in a Mg alloy were studied with atomic-resolution. The STGBs could be formed by reactions of { 10 1 ¯ 2 } twin boundaries with 60° basal dislocations (referred to as 〈a 60 〉) coming respectively from the twin and matrix, with each pair of 〈a 60 〉 forming a grain-boundary dislocation (GBD). Incident 〈a 60 〉 dislocations reacted with GBDs, consequently activating emission of twinning dislocations which resulted in migration of the STGBs. Interestingly, STGBs could be transformed into { 10 1 ¯ 2 } twin boundaries by either grain-boundary sliding or reacting with an array of basal 〈a 60 〉 dislocations. Graphical abstract: Image, graphical abstract