Deformation mechanism of fine grained Mg–7Gd–5Y–1.2Nd–0.5Zr alloy under high temperature and high strain rates

• DOI: 10.1016/j.jma.2020.02.017
• Publication Date: 2020-06-26T14:01:27Z
• Authors: Wanru Tang; Zheng Liu; Shimeng Liu; Le Zhou; Pingli Mao; Hui Guo; Xiaofang Sheng
• Keywords: Dynamic Recrystallization; Deformation mechanism

Fine grained Mg–7Gd–5Y–1.2Nd–0.5Zr alloy was investigated by dynamic compression tests using a Split Hopkinson Pressure Bar under the strain rates in range 1000–2000 s − 1 and temperature 293–573 K along normal direction. The microstructure measured optical microscopy, electron back-scattering diffraction, transmission microscopy X-ray diffractometry. results showed that had positive rate strengthening effect thermal softening at high temperature. solid solution of Gd Y atoms reduced asymmetry α-Mg crystals changed critical shear stress various deformation mechanisms. main mechanisms were prismatic slip pyramidal 〈a〉 slip, {102} tension twinning, recrystallization caused local such as particle-stimulated nucleation.