Triple and double twin interfaces in magnesium-the role of disconnections and facets.
Triple and double twin interfaces in magnesium-the role of disconnections and facets.
复制标题
镁的三重和双双界面 - 断开和方面的作用。
DOI：
10.1038/s41598-023-30880-w
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发表时间：
2023-03-08
影响因子：
4.6
通讯作者：
Paxton, Anthony T.
中科院分区：
文献类型：
--
作者：
Ruffino, Martina;Nutter, John;Zeng, Xun;Guan, Dikai;Rainforth, W. Mark;Paxton, Anthony T.
在六方晶系金属中，孪晶界面偏离孪晶面，在孪晶界面上经常观察到小平面。本文提出了一个基于孪晶断开的镁合金单、双、三孪晶界小面化模型。通过对称性参数预测的初级孪晶断开所示，以产生相称的方面在单孪晶界，然后转化为相称的方面在双孪晶界通过二级孪晶断开的行动。与此相反，它表明，三重孪晶界与拉伸-压缩-拉伸孪晶序列，没有相称的方面可以产生的作用，第三孪晶断开。讨论了小面对孪晶界面宏观取向的影响。通过对热轧Mg-1.18wt%Al-1.77wt%Nd合金的透射电镜研究，验证了理论分析的正确性。单双胞胎和双胞胎被观察到，以及罕见的三胞胎，和矩阵和三胞胎之间的界面是第一次捕获。与理论预测一致的小面通过高分辨率TEM成像，并测量从主孪晶平面的边界的宏观偏差。
Twin boundaries have been shown to deviate from the twinning planes in hcp metals, and facets have often been observed in twin interfaces. This study presents a twinning disconnection-based model for faceting in single, double and triple twin boundaries in magnesium. Primary twinning disconnections predicted via symmetry arguments are shown to produce commensurate facets in single twin boundaries, which are then transformed into commensurate facets in double twin boundaries via the action of secondary twinning disconnections. In contrast, it is shown that for triple twin boundaries with tension-compression-tension twinning sequence, no commensurate facets can be produced by the action of tertiary twinning disconnections. The effect of facets on the macroscopic orientation of twin interfaces is discussed. Theoretical findings are validated by a transmission electron microscopy study of a hot rolled Mg-1.18wt%Al-1.77wt%Nd alloy. Single and double twins are observed, as well as rare triple twins, and the interface between the matrix and a triple twin is captured for the first time. Facets consistent with theoretical predictions are imaged via high-resolution TEM and macroscopic deviations of the boundaries from the primary twinning planes are measured.
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