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

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet


  • Jincheng Yu
  • Bo Song
  • Dabiao Xia
  • Xun Zeng
  • Yuanding Huang
  • Norbert Hort
  • Pingli Mao
  • Zheng Liu

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.

ZeitschriftJournal of Magnesium and Alloys
Seiten (von - bis)849-859
Anzahl der Seiten11
PublikationsstatusErschienen - 01.09.2020
Extern publiziertJa

Bibliographische Notiz

Funding Information:
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