Achieving high mechanical and corrosion resistance synergy properties of the Mg-11Li-6Al alloy through simple solutionizing treatments

Abstract

This study aims to investigate the impact of solutionizing treatments on the mechanical and corrosion resistance properties of the Mg-10.93Li-5.45Al-0.08Er (LA116) alloy. The as-cast LA116 alloy is primarily composed of a single β phase along with AlLi and MgLiAl2 phases. Results demonstrate that the mechanical and corrosion resistance properties of the alloy experience considerable improvement after solutionizing treatments due to the synergistic effect of phase compositions and solid solution strengthening. Specifically, at 400 °C, the mechanical properties of the alloy witness a significant improvement due to the coordination of solid solution strengthening and the dissolution of the second phase. In contrast, the best corrosion resistance is observed at 250 °C due to the decomposition and uniform distribution of the AlLi phase.