Dissimilar welds between Al₂O₃ and AZX612-Mg alloy by friction stir spot welding

Abstract

Dissimilar welds between Al₂O₃ and AZX612-Mg alloy were obtained easily by a friction stir spot welding method with a machining center and a drilling machine. We analyzed the interface with scanning transmission electron microscopy energy dispersive X-ray spectrometry. The results suggested that the rotating tool induced the diffusion of Mg and Ca from the AZX612-Mg alloy, which reacted with Al₂O₃, forming Mg, Al, and Ca compounds and creating a strong welding interface at low temperatures.