In-situ investigation on the microstructure evolution of Mg-2Gd alloys during the V-bending tests

作     者：Chao He Jianxin Zhou Yan Yang Bin Jiang Ming Yuan Zhihua Dong Yanfu Chai Weijun He Guangsheng Huang Dingfei Zhang Fusheng Pan Chao He;Jianxin Zhou;Yan Yang;Bin Jiang;Ming Yuan;Zhihua Dong;Yanfu Chai;Weijun He;Guangsheng Huang;Dingfei Zhang;Fusheng Pan

作者机构：State Key Laboratory of Mechanical TransmissionsCollege of Materials Science and EngineeringChongqing UniversitySha Zheng Street 174#Sha Ping Ba DistrictChongqing 400044China National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China School of Mechanical and Electrical EngineeringShaoxing UniversityShaoxing 312000China School of Chemistry and Materials ScienceHubei Engineering UniversityXiaogan 432000China 

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

年 卷 期：2022年第131卷第36期

页      面：167-176页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the financial supports from the National Natural Science Foundation of China(U1764253,51971044,U1910213,52001037,U21A2048,U207601 and 52101126) Qinghai Scientific&Technological Program(2018-GX-A1) Natural Science Foundation of Chongqing(Project No.cstc2019jcyjmsxm X0234)。 

主　　题：Magnesium In-situ V-bending Microstructure Texture Microcracks 

摘      要：In this work,the in-situ observation of the microstructure in the Mg-2Gd(wt%)alloys during V-bending tests was operated.The microstructure and texture evolutions were characterized by the in-situ electron backscatter diffraction(EBSD),scanning electron microscopy(SEM)and the high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)technique.The results revealed a unique microcracks nucleation mechanism in the Mg-Gd alloys compared with the traditional Mg alloy(AZ31 alloy).The microcrack was nucleated at the grain boundary for the Mg-2Gd alloy and in the intragranular for the AZ31 alloy during the bending process.This difference mode between the Mg-Gd and the AZ31 alloys was mainly attributed to the more random topology of the grain boundary network,the lower grain boundary cohesion and the enhanced hinder ability for the dislocations due to the segregated Gd atoms in the Mg-Gd alloy.Furthermore,the microcracks that had a large angleθwith the extruded direction(ED)in the Mg-Gd alloys were preferred nucleated since grain boundaries had the larger normal stress during the bending process.