Structural characterization of {101¯2} twin boundaries in cobalt
Structural characterization of {101¯2} twin boundaries in cobalt
复制标题
DOI：
10.1063/1.4817180
复制
发表时间：
2013-07
影响因子：
4
通讯作者：
J. Tu;Xi-Yan Zhang;Jian Wang;Q. Sun;Qing Liu;C. Tomé
中科院分区：
文献类型：
--
作者：
J. Tu;Xi-Yan Zhang;Jian Wang;Q. Sun;Qing Liu;C. Tomé
利用高分辨率透射电镜对钴中{101¯2}变形孪晶界（TBs）的结构进行了表征，发现TBs由{101¯2}相干孪晶界和基底-棱柱界面（bp或PBs）组成。根据这些结构特征，{101¯2}孪晶的传播不能简单地通过孪晶位错的滑动-洗牌机制来完成。相应的，基于位错理论提出了两种TBs的迁移机制。此外，实验还观察到大量的基底层错与TBs有关，这一现象归因于bp和pb迁移导致的残余位错释放。
Using high-resolution transmission electron microscopy, we characterized the structures of {101¯2} deformation twin boundaries (TBs) in cobalt and found that TBs consist of {101¯2} coherent twinning boundaries and basal-prismatic interfaces (BPs or PBs). According to these structural features, the propagation of {101¯2} twins cannot be simply accomplished through the glide-shuffle mechanism of twinning dislocations. Correspondingly, two migration mechanisms of such TBs are proposed based on dislocation theory. In addition, abundant basal stacking faults are observed experimentally to connect with TBs, and this phenomenon is ascribed to the release of residual dislocations resulting from the migration of the BPs and PBs.