文献类型：期刊文献

英文题名：Precipitation Behavior and Its Effects on Mechanical Properties in a Pre-Twinned Mg-6Al-1Zn Alloy

作者：He, Jiejun Wu, Lushu Sun, Qihui Zhai, Liping

第一作者：何杰军

通信作者：He, JJ[1]|[1444053a3247f96f2357f]何杰军;

机构：[1]Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China;[2]Guizhou Inst Technol, Coll Mech Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院材料与冶金工程学院;贵州理工学院;

年份：2018

卷号：59

期号：8

起止页码：1389-1395

外文期刊名：MATERIALS TRANSACTIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000458694300027)】；

基金：This work was supported by the National Natural Science Foundation of China (51501045), Natural Science Foundation of Guizhou Province (J[2015]2067), Research Foundation for Advanced Talents in Guizhou Institute of Technology (XJGC20141102), Foundation of Talent Team (Guizhou(2015)4008, (2016)5104) and Innovation Project of Guizhou Institute of Technology (0417116).

语种：英文

外文关键词：magnesium alloy; twin boundary structure; second phase; precipitation behavior

摘要：In the present study, an extruded Mg-6Al-1Zn alloy was pre-compressed along extrusion direction to generate sufficient tensile twins. Afterward, the pre-twinned samples were annealed at 170 degrees C for aging. Precipitation of the second-phase particles was found to preferentially occur in twins and twin boundaries. The precipitation phase is proved to be Al12Mg17. Moreover, precipitation behaviors in the two twin boundaries on both sides of every twin were very different: a considerable number of second-phase particles precipitated in one twin boundary but only a few second-phase particles were present in the other twin boundary. The atomic structures or internal stresses of the two twin boundaries are assumed to be different. A theoretical model of atomic structure was constructed to analyze the difference between the two twin boundaries. This model shows that atomic densities of the two twin boundaries are different, thereby resulting in varying precipitation behaviors. Owing to precipitation in twins and twin boundaries, an obvious increase in yield stress was observed when the material was reloaded along the same direction.