Dynamic tensile properties and microstructural evolution of extruded EW75 magnesium alloy at high strain rates

作     者：Jincheng Yu Bo Song Dabiao Xia Xun Zeng Yuanding Huang Norbert Hort Pingli Mao Zheng Liu Jincheng Yu;Bo Song;Dabiao Xia;Xun Zeng;Yuanding Huang;Norbert Hort;Pingli Mao;Zheng Liu

作者机构：School of Mechanical TechniqueWuxi Institute of TechnologyWuxi 214121China School of Materials and EnergySouthwest UniversityChongqing 404100China National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China MagIC-Magnesium Innovation CentreHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany School of Materials Science and EngineeringShenyang University of TechnologyShenyang 110870China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2020年第8卷第3期

页      面：849-859页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors would like to thank Professor Kui Zhang,Beijing General Research Institute for Nonferrous Metal,for providing EW75 magnesium alloy for this work and acknowledge the funding from the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.17KJD430006) Scientific and Technological Innovation Team Foundation of Wuxi Institute of Technology(No.30593118001) Scientific Research Project of Wuxi Institute of Technology(No.ZK201901).The help of EBSD experiment provided by Yukyung Shin from Helmholtz-Zentrum Geesthacht is gratefully acknowledged 

主　　题：EW75 magnesium alloy High strain rates Split Hopkinson test Texture Microstructure 

摘      要：The dynamic tensile properties and microstructural evolution of an extruded EW75 magnesium alloy deformed at ambient temperature and different high strain rates(from 1000 to 3000 s^(-1))along extrusion direction(ED)were investigated by Split Hopkinson Tension Bar(SHTB).The corresponding deformation mechanisms,texture evolution and microstructure changes were analyzed by optical microscope(OM),electron backscatter diffraction(EBSD)and transmission electron microscope(TEM).The results show that the extruded EW75 magnesium alloy along ED exhibits a conventional positive strain rate sensitivity that the dynamic flow stresses increase with in creasing strain *** measurements show that after dynamic tension,the initial weak texture of extruded EW75 magnesium alloy tansforms to a relatively strong//ED texture with increasing strain *** microstructural analysis demonstrates that dislocation motion are main deformatin mode to accommodate dynamic tensile deformation at high strain *** addition,the interactions of dislocation-dislocation and dislocation-second phase lead to the in crease of flow stress and strain hardening with increasing strain rate.