Diffusion bonding of Ti-6Al-4V to ZQSn10-10 with nickel interlayer

The experimental investigation of the diffusion bonding of titanium alloy (Ti-6Al-4V) to tin-bronze (ZQSn10-10) was carried out. The microforms of diffusion joint were analyzed using field emission scanning electron microscope with an attached energy dispersive X-ray analyzer. The results show that due to diffusion of the elements, a layer of intermetallic compound is formed between these two materials as they are bonded together directly, leading to a 30% strength of the base metal (ZQSn10-10) in joint region. If Ni is used as an interlayer to prevent element from diffusion, the microstructure is considerably improved in joint region. When the optimum bonding parameters are chosen as follows: bonding temperature T=830°C, bonding pressure p=15 MPa, bonding time t=30 min, the strength of joint without obvious change in shape is 65% as compared with base metal (ZQSn10-10), reaches 155 MPa.