Effects of Annealing Process on Interfacial Microstructure and Properties of Roll-casted Ti-Al Composite Plate

Abstract

Ti-Al composite plate is prepared by cast rolling method, then annealing treatment of different processes is carried out on it. Mechanical properties and hardness of the composite plate under different annealing processes are tested by precision universal testing machine and micro hardness tester. Scanning electron microscope (SEM) is used to observe interface layer morphology, tensile fracture morphology. The results show that: after annealing at 450℃ for 3 h, good metallurgical bonding layer is formed by diffusion of Ti and Al. The thickness of the interface layer is about 2.5 μm. At this time the tensile strength is 103 MPa and elongation rate is 53%. When the two kinds of metal are stretched, cracking degree is the least and comprehensive performance is the best.