Mg–10Gd–3Y–0.5Zr casting was subjected to friction stir processing (FSP) at a tool rotation rate of 800rpm and a traverse speed of 50mm/min. FSP resulted in the fundamental dissolution of the coarse network-like β-Mg5(Gd,Y) phase and remarkable grain refinement (∼6.1μm), thereby significantly improving the strength and ductility of the casting. Post-FSP aging resulted in the precipitation of fine β′′ and β′ particles in a fine-grained magnesium matrix, producing an ultimate tensile strength of 439MPa and a yield strength of 330MPa. FSP combined with aging is a simple and effective approach to enhancing the mechanical properties of Mg–Gd–Y–Zr casting.
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