Nano-scale Elastic Strain Maps of Twins in Magnesium Alloys
Nano-scale Elastic Strain Maps of Twins in Magnesium Alloys
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DOI：
10.1017/s1431927618005342
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发表时间：
2018-08
影响因子：
2.8
通讯作者：
Luoning Ma;P. Rottmann;K. Xie;K. Hemker
中科院分区：
文献类型：
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作者：
Luoning Ma;P. Rottmann;K. Xie;K. Hemker
延伸双边界的成核和传播机制引起了极大的实验和计算兴趣[1]，通常可以接受镁中的变形双胞胎在二元格的范围或二线（k1）方向（k1）的元素（k1）中的转化归因于镁的传播。 uffling [2，3]。 {-1012}双胞胎偏离理想的K1平面，尤其是在尖端[4，5]。另一方面，白羊座传播双胞胎。基于其MD模拟的改组模型在没有TD的帮助下解释了双胞胎的传播[7]，但改组模型仍然有争议，因为它与双胞胎繁殖的保守原则相矛盾。
The nucleation and propagation mechanisms of extension twin boundaries (TB) have aroused great experimental and computational interests [1]. It is commonly accepted that the propagation of deformation twins in magnesium is attributed to the glide of twinning dislocations or disconnections (TD) on the twin plane (K1) along the twinning direction (η1), which is activated by a combination of shear stress and atomic shuffling [2, 3]. However, it has been frequently observed that the TBs of {-1012} twins deviate from the ideal K1 planes, especially at the tips [4, 5]. Braisaz, et al. noted that the abnormal deformation around the twin tips can be accommodated by the combination of regular K1 boundaries as well as a high-angle basal-prismatic (BP/PB) boundary [6]. They also pointed out that the TDs can slip on K1 boundaries and cross-slip onto the BP/PB boundaries to propagate the twins. On the other hand, Li and Ma proposed a shuffling model based on their MD simulations to explain the propagation of twins without the help of TDs [7]. Nevertheless, the shuffling model remains controversial because it contradicts the well-accepted conservative principle of twin propagation.