|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||Significant Disparity of Non-basal Dislocation Activities in Hot-rolled Mg and AZ31 Alloy Under Tension
||Dexin Zhao, Xiaolong Ma, Abhinav Srivastavaa, Griffin Turner, Ibrahim Karaman, Kelvin Y. Xie
|On-Site Speaker (Planned)
AZ31 alloy exhibits much better tensile ductility than pure Mg. However, the underpinning mechanisms remain unexplored at dislocation level. In this work, we deformed hot-rolled pure Mg and AZ31 samples with similar microstructures under tension along rolling direction. We then investigated their deformation mechanisms using transmission electron microscopy. Systematic tilting experiments and statistical analyses at different strain levels revealed a significant disparity of non-basal dislocation activities between them. For pure Mg, <c + a> dislocations were activated since the early stage of plastic deformation. The <c + a> dislocations display much shorter dissociation distance compared to the ones reported from c-axis compression. For AZ31, <c + a> dislocations were largely absent at all strain levels, even in the strain-to-failure samples. The absence of <c + a> dislocations and the presence of profuse non-basal <a> dislocations could be the key to elucidate the much-improved ductility in AZ31 compared to pure Mg.
||Magnesium, Characterization, Mechanical Properties