Impulse pressuring diffusion bonding of titanium alloy to stainless steel with nickel interlayer

Titanium alloy TA17 and austenitic stainless steel 0Cr18Ni9Ti were bonded by using impulse pressuring diffusion bonding(IPDB)with nano nickel particles, nano nickel plating and pure nickel foil as a interlayer, respectively, and the tensile strength of bonded joint was tested.The bonding strength of the joint bonded by using the three types of nickel interlayer metals has reached as high as 212MPa, 175MPa and 334MPa, respectively.The properties of the bonded joint using pure nickel foil are clearly better than the joints obtained by nano nickel particles and nano nickel plating.The fracture appearances were observed and analyzed by metallographic microscope.Element distribution and phase structures of each joint zone were analyzed by scanning electron microscope (SEM)and energy dispersive spectroscopy (EDS)and X-ray diffraction (XRD). The results show that the density of the nano nickel particles interlayer is not high enough, the quality of the plating interlayer of nano nickel is not good enough which limited the increase of the joint strength, but Ni interlayer has successfully inhibited interdiffusion of Fe and Ti and avoided forming Fe-Ti series intermetallics.