Dislocation behavior in a polycrystalline Mg-Y alloy using multi-scale characterization and VPSC simulation  

作　　者：Bijin Zhou Leyun Wang Jinhui Wang Alireza Maldar Gaoming Zhu Hailong Jia Peipeng Jin Xiaoqin Zeng Yanjun Li 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shanghai 200240,China [2]School of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China [3]Department of Materials Science and Engineering,Norwegian University of Science and Technology,Trondheim 7491,Norway [4]School of Mechanical Engineering,Qinghai University,Xining 810016,China [5]Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Nanling Campus,Jilin University,Changchun 130025,China [6]State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Materials Science & Technology》2022年第3期87-98,共12页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51631006 and 51671127);the Qinghai Provincial Science and Technology Key Program(No.2018GX-A1)the China Scholarship Council(No.201806230150)

摘　　要：In this study,the dislocation behavior of a polycrystalline Mg-5Y alloy during tensile deformation was quantitatively studied by an in-situ tensile test,visco-plastic self-consistent(VPSC)modeling,and transmission electron microscopy(TEM).The results of the in-situ tensile test show that<a>dislocations contribute to most of the deformation,while a small fraction of<c+a>dislocations are also activated near grain boundaries(GBs).The critical resolved shear stresses(CRSSs)of different dislocation slip systems were estimated.The CRSS ratio between prismatic and basal<a>dislocation slip in the Mg-Y alloy(~13)is lower than that of pure Mg(~80),which is considered as a major reason for the high ductility of the alloy.TEM study shows that the<c+a>dislocations in the alloy have high mobility,which also helps to accommodate the deformation near GBs.

关 键 词：Mg-Y alloy Dislocation behavior Deformation mechanisms Critical resolved shear stress 

分 类 号：TG146.22[一般工业技术—材料科学与工程]