文献类型：会议论文

英文题名：Precipitation behavior and its effects on mechanical properties in a pre-Twinned Mg6Al1Zn alloy

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

第一作者：何杰军

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

机构：[1] School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China; [2] College of Mechanical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China

第一机构：贵州理工学院材料与冶金工程学院

通信机构：|贵州理工学院材料与冶金工程学院

语种：英文

外文关键词：Aluminum alloys - Atoms - Magnesium alloys - Tensile strength - Ternary alloys - Yield stress - Zinc alloys

年份：2018

摘要：In the present study, an extruded Mg6Al1Zn alloy was pre-compressed along extrusion direction to generate sufficient tensile twins. Afterward, the pre-twinned samples were annealed at 170°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. ? 2018 The Japan Institute of Metals and Materials.