Crystallographic characters of {11¯22} twin-twin junctions in titanium
Crystallographic characters of {11¯22} twin-twin junctions in titanium
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DOI：
10.1080/09500839.2017.1402132
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发表时间：
2017-11
影响因子：
1.2
通讯作者：
Shun Xu;M. Gong;Xinyan Xie;Yue Liu;C. Schuman;J. Lecomte;Jian Wang
中科院分区：
文献类型：
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作者：
Shun Xu;M. Gong;Xinyan Xie;Yue Liu;C. Schuman;J. Lecomte;Jian Wang
α-钛中通常激活的抽象收缩孪晶相互作用，并形成三种类型的孪晶-孪晶结（TTJ），对应于六种孪晶变体（i = 1,2, … , 6）的晶体学。我们在轧制的纯 α-钛片中检测到 243 个 TTJ。电子背散射衍射分析表明，TTJs较多，三种类型中TTJs占79.8%，而TTJs分别占17.7%和2.5%。不会发生双传输。因此，与孪生相互作用相关的边界阻碍孪生传播并影响孪生生长。我们根据Schmid因子分析和孪晶位错的反应机制解释了TTJ的结构特征。有关 TTJ 的知识为提高六方金属细观/宏观晶体塑性模型的预测能力提供了见解。
Abstract contraction twins that are commonly activated in α-titanium interact to each other and form three types of twin–twin junctions (, , TTJs) corresponding to the crystallography of six twin variants (i = 1,2, … , 6). We detected 243 TTJs in rolled pure α-titanium sheets. Electron backscatter diffraction analysis reveals that TTJs are profuse, 79.8% among three types while and TTJs take up 17.7 and 2.5%. Twin transmission does not occur. Consequently, boundaries associated with twin–twin interactions block twin propagation and influence twin growth. We explain structural features of TTJs according to the Schmid factor analysis and the reaction mechanism of twinning dislocations. The knowledge regarding TTJs provides insight for improving the predictive capability of meso/macro-scale crystal plasticity models for hexagonal metals.