Formation of long-period stacking ordered phase only within grains in Mg–Gd–Y–Zn–Zr casting by friction stir processing

•Friction stir processing (FSP) was applied to Mg–Gd–Y–Zn–Zr casting.•The grain boundary Mg3RE and LPSO phases in the casting dissolved after FSP.•Fine grains with LPSO phase distributed only within the grains was achieved.•High mechanical properties were obtained in FSP Mg–Gd–Y–Zn–Zr. Friction stir...

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