Abstract
The rare-earth (RE) contained ultrafine grained (UFG) Magnesium (Mg) alloys are excellent materials for aerospace and automobile industries due to their ultra-light weight, high strength, reduced tension to compression yield asymmetry, etc. Despite their excellent properties, the manufacturing potential of UFG Mg-RE alloys is yet to be realized. The present work is focused on engineering UFG microstructure in a Mg-Ag-Nd alloy (a Mg-RE alloy) and establishing the manufacturing potential of such engineered UFG Mg-RE alloy via processing map and constitutive analysis studies. The processing map is developed for a temperature range of 300 °C-450 °C and a strain rate range of 0.001 s−1-1 s−1, respectively. Three stability domains and one instability domain were identified. The governing mechanisms and scientific know-how of both types of domains are established via mechanical testing followed by detailed microstructural characterization, including Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) analysis. A unique unexplored grain boundary sliding (GBS) mechanism-based stability domain is found as a dominant mode of deformation in one of the stability domains in the engineered UFG Mg-RE alloys.
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