In situ observation of transmission and reflection of dislocations at twin boundary in CoCrNi alloys

作     者：LIANG YanXiang YANG XiaoFang MING KaiSheng XIANG ShiHua LIU Qing LIANG YanXiang;YANG XiaoFang;MING KaiSheng;XIANG ShiHua;LIU Qing

作者机构：International Joint Laboratory for Light Alloys(Ministry of Education)College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Key Laboratory of Aerospace Materials and Performance(Ministry of Education)School of Materials Science and EngineeringBeihang UniversityBeijing 100191China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第2期

页      面：407-413页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51571046 and 51421001) the Fundamental Research Funds for the Central Universities(Grant No.2018CDJDCL0019) the“111”Project(Grant No.B16007)by the Ministry of Education and the State Administration of Foreign Experts Affairs of China 

主　　题：dislocation transmission reflection TEM CoCrNi alloys 

摘      要：The deformation mechanism of CoCrNi alloy with high density of annealing twins was studied by in situ transmission electron microscopy. Dislocation transmission and reflection at the twin boundary were observed during in situ loading. We characterized these reaction processes by combining TEM, dislocation theory and crystallography of twin. Twin boundary not only strengthens the material by impeding the motion of dislocation, but also acts as dislocation source to produce large of slip bands. These processes generate large of slip bands to accommodate the plastic deformation or strengthening material.