Influence of interfacial reaction layer morphologies on crack initiation and propagation in Ti/Al joint by laser welding-brazing

摘要

Influence of interfacial reaction on crack initiation and propagation in Ti/Al joint by laser welding-brazing (LWB) was investigated to obtain strong joints. According to in situ observation of crack initiation and propagation and analysis of fracture surface, the effects of different reaction layer including interfacial layer with insufficient interfacial reaction, lamella-shaped morphology, cellular/serration-shaped morphology, club-shaped morphology, and thick continuous morphology on crack initiation and propagation was discussed. It was found that the joint with lamella-shaped, cellular or serration-shaped, club-shaped interfacial layer has the highest mechanical property in current study.