纯锌中变形孪晶界精细结构的透射电子显微镜表征  

Characterization of Microstructure of Deformation Twin Boundary in Zinc by Transmission Electron Microscopy

作　　者：吴海辰 陈国新[1,2] 于海涛 沈圣成 梁芮[1,2] 卢焕明 WU Hai-chen;CHEN Guo-xin;YU Hai-tao;SHEN Sheng-cheng;LIANG Rui;LU Huan-ming(Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang China;Ningbo New Material Testing and Evaluation Center Co.Ltd.,Ningbo 315201,Zhejiang China)

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [2]宁波新材料测试评价中心有限公司,浙江宁波315201

出　　处：《分析测试技术与仪器》2022年第3期247-253,共7页Analysis and Testing Technology and Instruments

基　　金：浙江省基础公益研究计划项目(LGC20E010002);中国科学院青年创新促进项目(2019295)。

摘　　要：运用透射电子显微镜对密排六方的纯锌中由变形引发的{101^(-)2}孪晶界精细结构进行了表征,发现实际孪晶界会在宏观尺度上大幅偏离理论孪晶面.高分辨透射电子显微镜分析表明,实际孪晶界可以由{101^(-)2}共格孪晶面和小段基面/柱面(BP/PB)台阶相互连接组成,也可以仅由一系列相互垂直的BP/PB台阶连接而成.这两种结构不同的孪晶界可以共存于同一个{101^(-)2}孪晶中.结合位错理论对两种孪晶界的迁移机制进行了讨论,第一种孪晶界的迁移是通过孪生位错在共格孪晶界上运动和界面位错在BP/PB台阶上运动来实现的,第二种孪晶界则要通过局部晶胞重构机制实现迁移.两种孪晶界的共存可以由孪晶的形核和生长过程解释.The microstructure of{101^(-)2}twin boundary in zinc induced by severe plastic deformation was characterized using transmission electron microscope (TEM).The result showed that the actual twin boundary can deviate significantly from the theoretical twinning plane.By high resolution TEM analysis,the actual twin boundaries consist of {101^(-)2}coherent twin boundary (CTB) connected with short BP/PB facets,or only consist of a series of BP/PB facets perpendicular to each other.These two kinds of twin boundaries with different microstructures can coexist stably in a{101^(-)2}twin.Based on the dislocation theory,the migration mechanism of these two kinds of twin boundaries was discussed.For the first kind of twin boundary,the migration can be accomplished via the motion of twinning dislocation on the CTB together with the motion of interface dislocation on the BP/PB facets.For the second kind of twin boundary,the migration is accomplished via a unit cell reconstruction mechanism.The coexistence of the two kinds of twin boundaries can be explained based on the nucleation and growth process of a{101^(-)2}twin.

关 键 词：孪晶 透射电子显微镜 密排六方 微观结构 

分 类 号：O657[理学—分析化学] O762[理学—化学]