Fabrication, microstructure, and properties of interface-reinforced Mg/Mg bimetal composites by long-period stacking ordered structures

Abstract Interface-reinforced Mg–6Zn–Zr/Mg–4Y-2Gd–Nd (wt. %) bimetal composites by long-period stacking ordered (LPSO) structures were fabricated and the interfacial microstructures and properties were investigated. Results revealed the presence of a (Mg, Zn)3RE phase (RE: Y, Nd, Gd), stacking faults, and variations in chemical composition at as-cast bonding interface. After heat treatment, interfacial LPSO structures, characterized as 14H and 24R types, were formed. The novel composites exhibited an interfacial shear strength superior to that of base metals and other light bimetal composites due to the generation of LPSO structures and kink-deformation bands. This finding provides a new approach for the design of high-performance bimetal composites.