Intrinsic Strengthening of Coherent Twin Boundaries in Copper

作     者：Yanfen Luo Yuchen Wang Yanbo Wang Yuanming Wang Manling Sui 

作者机构：Shenyang National Laboratory for Materials Science （SYNL） Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2009年第25卷第2期

页      面：211-214页

核心收录：

学科分类：070207[理学-光学] 07[理学] 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）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China under grant Nos.50471080 and 50125103 the "Hundred of Talents Pro-gram" of the Chinese Academy of Sciences 

主　　题：Twin boundary Dislocation Molecular dynamic simulation 

摘      要：Molecular dynamics （MD） simulations were applied to simulate the deformation process of copper with different density of parallel coherent twin boundaries （TBs）. It is shown that the strength of perfect copper crystal enhances with increasing coherent TB density. Based on the local hydrostatic pressure analysis, we found that stress concentrations are more likely to form in the interior of the crystal rather than around the TBs. Since the dislocation nucleation is suppressed in the vicinity of the coherent TBs and each TB plane hinders dislocations from propagating, the coherent TBs can be regarded as an intrinsic strengthening phase relative to perfect crystal.