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 〈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 { 10 1 ¯ 2 } twin boundaries by either grain-boundary sliding or reacting with an array of basal 〈a60〉 dislocations.

中文翻译：

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镁合金{101¯2}孪晶取向附近对称倾斜晶界形成和演化的原子分辨率研究

摘要 以原子分辨率研究了镁合金中{10 1 ¯ 2 }孪晶取向附近对称倾斜晶界(STGBs)的形成和演化。STGBs 可以通过 {10 1 ¯ 2 } 孪晶界与分别来自孪晶和基体的 60°基底位错（称为〈a60〉）的反应形成，每对〈a60〉形成晶界位错(GBD)。事件<a60>位错与GBDs反应，从而激活孪晶位错的发射，导致STGBs的迁移。有趣的是，STGB 可以通过晶界滑动或与一系列基础〈a60〉位错反应转化为 {10 1¯ 2 } 孪晶界。