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The effect of tension twin on the dynamic recrystallization behavior in polycrystal magnesium by atomistic simulation
Applied Physics A ( IF 2.7 ) Pub Date : 2020-01-01 , DOI: 10.1007/s00339-019-3255-8
Shichao Song , Yu Wang , Yang Wang , Xi Wang , Zhen Zhang

To investigate the $$\{10\bar{1}2\}$$ { 10 1 ¯ 2 } tension twin effects on the dynamic recrystallization structure evolution in magnesium alloys, the compression deformation of a magnesium polycrystal containing an initial $$\{10\bar{1}2\}$$ { 10 1 ¯ 2 } tension twin under different loading directions was simulated by molecular dynamics method. The results showed that the dynamic recrystallization phenomena only occurred when loading normal to twin boundary. By tracking atoms’ motion, it was found that the twin dynamic recrystallization microstructure evolution could be divided into two steps. Step one: basal partial dislocations nucleated near twin boundary, leading to large area of stacking faults; Step two: due to the accumulation of strain energy, non-basal slip systems nucleated in the stacking faults region, promoting the stacking faults to recover to hexagonal close-packed structure and forming the new grains. When loading parallel to twin boundary, the twin boundary migration dominated the deformation process, which released the strain energy and inhibited the nucleation of dynamic recrystallization.

中文翻译:

通过原子模拟研究张力孪晶对多晶镁动态再结晶行为的影响

为了研究 $$\{10\bar{1}2\}$$ { 10 1 ¯ 2 } 张力孪晶对镁合金动态再结晶结构演化的影响,含初始 $$\ 的镁多晶的压缩变形{10\bar{1}2\}$$ { 10 1 ¯ 2 } 不同载荷方向下的张力孪晶采用分子动力学方法模拟。结果表明,动态再结晶现象仅在垂直于孪晶边界加载时发生。通过跟踪原子运动发现孪生动态再结晶微观结构演化可分为两个步骤。第一步:基底部分位错在孪晶界附近成核,导致大面积堆垛层错;第二步:由于应变能的积累,非基底滑移系统在堆垛层错区成核,促使堆垛层错恢复为六方密堆积结构并形成新的晶粒。当平行于孪晶边界加载时,孪晶边界迁移主导了变形过程,释放了应变能并抑制了动态再结晶的形核。
更新日期:2020-01-01
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