TY - JOUR

T1 - Dynamic tensile properties and microstructural evolution of extruded EW75 magnesium alloy at high strain rates

AU - Yu, Jincheng

AU - Song, Bo

AU - Xia, Dabiao

AU - Zeng, Xun

AU - Huang, Yuanding

AU - Hort, Norbert

AU - Mao, Pingli

AU - Liu, Zheng

N1 - 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) and 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. Publisher Copyright: © 2020

PY - 2020/9/1

Y1 - 2020/9/1

N2 - 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 increasing strain rate. Texture measurements show that after dynamic tension, the initial weak texture of extruded EW75 magnesium alloy tansforms to a relatively strong <10-10>//ED texture with increasing strain rates. The microstructural analysis demonstrates that dislocation motion are main deformatin mode to accommodate dynamic tensile deformation at high strain rates. In addition, the interactions of dislocation-dislocation and dislocation-second phase lead to the increase of flow stress and strain hardening with increasing strain rate.

AB - 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 increasing strain rate. Texture measurements show that after dynamic tension, the initial weak texture of extruded EW75 magnesium alloy tansforms to a relatively strong <10-10>//ED texture with increasing strain rates. The microstructural analysis demonstrates that dislocation motion are main deformatin mode to accommodate dynamic tensile deformation at high strain rates. In addition, the interactions of dislocation-dislocation and dislocation-second phase lead to the increase of flow stress and strain hardening with increasing strain rate.

KW - EW75 magnesium alloy

KW - High strain rates

KW - Microstructure

KW - Split Hopkinson test

KW - Texture

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85085297958&partnerID=8YFLogxK

U2 - 10.1016/j.jma.2020.02.013

DO - 10.1016/j.jma.2020.02.013

M3 - Journal articles

AN - SCOPUS:85085297958

VL - 8

SP - 849

EP - 859

JO - Journal of Magnesium and Alloys

JF - Journal of Magnesium and Alloys

SN - 2213-9567

IS - 3

ER -