Structural stability and mechanical properties of intermetallic compounds with the order-disorder (OD) structure

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Ternary Mg-TM (Transition-metal)-RE (Rare-earth) phases with long-period stacking-ordered (LPSO) structures have received a considerable amount of attention as new types of strengthening phases in high-strength Mg alloys. These LPSO phases are reported to be beneficial to endowing Mg alloys with high strength and high ductility simultaneously. However, mechanisms behind this have largely remained unsolved. In the present study, the crystal structure models for the LPSO phases were established based on the crystallographic concept of the order-disorder (OD) theory. Structural stability, formation mechanism and deformation behavior of the LPSO/OD phases were investigated.