The High-Solution Design of Magnesium Alloys

摘要

The broad applications of Mg alloys are still limited by poor mechanical properties and poor corrosion resistance. Our group has found strength, ductility, as well as corrosion resistance of Mg alloys can be synergic enhanced by solution elements in primary Mg phase. However, most elements only show limited solubility in α(Mg) phase. We proposed that by dissolving multi-elements in the α phase, the enhanced entropy may bring enlarged solution and cocktail effects to the final properties of Mg alloys. This solubility extension possibility was firstly investigated in this work using thermodynamic evaluation based on connected databases. Thermodynamics indicates that the solubility of Rare-earth elements (REs) in a phase can be extended by the synergetic dissolving of Li and REs in α phase. This finding is instructive for the design of high solution of Mg alloys, and provides a new strategy for improving the performance of Mg alloys by high-solution design (HSD) of primary phase in alloy.