Effects of the aluminum concentration on twin boundary motion in pre-strained magnesium alloys  

作　　者：Yujie Cui Kenta Aoyagi Huakang Bian Yuichiro Hayasaka Akihiko Chiba 

机构地区：[1]Institute for Materials Research,Tohoku University,Sendai 980-8577,Japan [2]The Electron Microscopy Center,Tohoku University,Sendai 980-8577,Japan

出　　处：《Journal of Materials Science & Technology》2021年第14期116-127,共12页材料科学技术（英文版）

基　　金：funded by Japan Society for the Promotion of Science(grant no.18K14024)。

摘　　要：We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering diffraction observations,and high-angle annular dark-field scanning transmission electron microscopy observations.The twin growth was restricted by increased Al concentration,which resulted in the occurrence of smaller-sized twins.The reverse motion of twin boundaries was also restricted,resulting in the formation of higher fractions of secondary twins and 2–5°boundaries during reverse tension.The secondary twins and 2–5°boundaries mainly contributed to the increased ultimate tensile strength of the pre-strained Mg alloys.This effect is more significant in Mg alloys with larger pre-compression.Moreover,the increased amount of the Al solute atoms,rather than the precipitates,mainly contributed to the increased strengthening effect on the twin boundary motion.Our research contributes to development of high-strength Mg alloys by stabilizing twin boundaries.

关 键 词：Hexagonal close packed Magnesium alloy TWINNING Dislocations Strength Solute atoms 

分 类 号：TG146.22[一般工业技术—材料科学与工程]