期刊
JOURNAL OF MAGNESIUM AND ALLOYS
卷 8, 期 3, 页码 849-859出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2020.02.013
关键词
EW75 magnesium alloy; High strain rates; Split Hopkinson test; Texture; Microstructure
资金
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJD430006]
- Scientific and Technological Innovation Team Foundation of Wuxi Institute of Technology [30593118001]
- Scientific Research Project of Wuxi Institute of Technology [ZK201901]
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. (c) 2020 Published by Elsevier B.V. on behalf of Chongqing University.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据