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

• DOI: 10.1016/j.jma.2020.02.013
• Publication Date: 2020-05-28T03:27:38Z
• Authors: Jincheng Yu; Bo Song; Dabiao Xia; Xun Zeng; Yuanding Huang; Norbert Hort; Pingli Mao; Zheng Liu
• Keywords: Flow stress; Texture (cosmology); Strain hardening exponent; Work hardening

The dynamic tensile properties and microstructural evolution of an extruded EW75 magnesium alloy deformed at ambient temperature different high strain rates (from 1000 to 3000 s-1) along extrusion direction (ED) were investigated by Split Hopkinson Tension Bar (SHTB). corresponding deformation mechanisms, texture microstructure changes analyzed optical microscope (OM), electron backscatter diffraction (EBSD) transmission (TEM). results show that the ED exhibits a conventional positive rate sensitivity flow stresses increase with increasing rate. Texture measurements after tension, initial weak tansforms relatively strong <10-10>//ED rates. analysis demonstrates dislocation motion are main deformatin mode accommodate In addition, interactions dislocation-dislocation dislocation-second phase lead stress hardening