Abstract
Friction stir welding (FSW) is a suitable solid-state joining process for dissimilar metal joining. We have performed metallographic characterizations to investigate the effects that an alloying element has on the interfacial microstructure between a dissimilar joint of AZ31 magnesium alloy and commercial pure titanium, produced by FSW. At the joint interface, an interfacial layer was observed with a thickness of less than 100 nm in a STEM-HAADF image produced with a transmission electron microscope (TEM) and an energy dispersive X-ray spectroscope (EDS). In this layer, TiAl intermetallic compound was observed with nano-beam diffraction (NBD).
