|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Microstructure Evolution, Defect Structure and Mechanical Properties in Ultrafine-grained MgGd Alloy Processed by High Pressure Torsion
||Miloš Janeček, Michaela Poková, Jitka Stráská, Jakub Čížek, Radomír Kužel, Jung Gi Kim, Hyoung Seop Kim
|On-Site Speaker (Planned)
Ultrafine-grained Mg22Gd alloy was processed by high pressure torsion at room temperature and the pressure of 2GPa. A series of specimens with different number of rotations N (N=0-15) was prepared. The microstructure (grain size, phase composition, phase morphology, etc.) evolution with strain due to HPT was investigated by light and scanning electron microscopy and EDS. Electron back scatter diffraction (EBSD) was employed to characterize the fragmentation of the initial coarse grain structure with increasing strain. The lattice defects were characterized by enhanced techniques of positron annihilation spectroscopy (both the lifetime and Doppler broadening spectroscopy) and X-ray diffraction.
Mechanical properties were investigated by detail 2D microhardness measurement and found to correlate well with microstructure evolution and the character of strain imposed to the material.
A detail comparison of mechanical properties and microstructure and defect evolution of the Mg22Gd alloy with other magnesium alloys previously investigated by the authors is included.