The Research On Diffusion Bonding Of Dissimilar Materials Of Ti-6Al-4V And ZQSn10-10

From the viewpoint of diffusion-bondability of materials, the diffusion bonding between intermetallic compound Ti-6Al-4V/ZQSn10-10 with Cu and Ni interlayer was carride out .The effect of bonding parameters on tensile strength of jionts was discussed, the process in the growth of intermetallic compounds was discussed, and the finite element modeling of residual stresses in the diffusion bonding joints was also discussed.Direct diffusion bonding of Ti-6Al-4V/ZQSn10-10 has been performed and the result indicates the best technique condition on P=10MPa, T=850℃, t=30min, and the tensile strength of 84MPa, above 28% that of the matrix Cu alloy. Base on the diffusion bonding theory, the composition proportion of the formed phases at the interface of Ti-6Al-4V/ZQSn10-10, and the rule of growth in intermetallics were analyzed. The form and growth can be divied into five processes. a) physics contact, b) the Ti(ss,Cu) was formed, c) the intermetallics compound of Cu3Ti and CuSn3Ti5 were formed, and some Pb particle was also presented, d) the growth of intermetallics compound, e) formed theβ-Ti,α- Ti and Ti(ss,Cu) structure at the interface in the depress temperature process.Diffusion bonding of Ti-6Al-4V/ZQSn10-10 with Cu interlayer was carried out and the tension strength of joint was a little better than that of direct joint under th best technique condition of P=10MPa, T=850℃, t=30min. The diffusion bonding joint is composed of Cu3Ti2, CuTi, CuTi2,β-Ti,α- Ti and Ti(ss,Cu). The fracture appearance is mixed type fracture, the intension of joint was mostly brittle fracture figure, but some plastic fracture figure also has been found. Ni interlayer can increase evidently the tensile strength of Ti-6Al-4V/ ZQSn10-10 diffusion bonding joint and the tensile strength of joint can reach to 155MPa, under the technique condition of P=10MPa, T=830℃, t=30min, Which is 52% of the ZQSn10-10. The tensile strength of Ti-6Al-4V/Ni/ZQSn10-10 joint was depended on Ti-6Al-4V/Ni interface, and NiTi and Ni3Ti were found out on the...