Effect of Bonding Time on Interfacial Reaction and Mechanical Properties of Diffusion-Bonded Joint Between Ti-6Al-4V and 304 Stainless Steel Using Nickel as an Intermediate Material

摘要: In the current study, solid-state diffusion bonding between Ti-6Al-4V (TiA) and 304 stainless steel (SS) using pure nickel (Ni) of 200-μm thickness as an intermediate material was carried out in vacuum. Uniaxial compressive pressure temperature were kept at 4 MPa 1023 K (750 °C), respectively, time varied from 30 to 120 minutes steps 15 minutes. Scanning electron microscopy images, backscattered mode, revealed layerwise Ti-Ni-based intermetallics like either Ni3Ti or both NiTi titanium alloy-nickel (TiA/Ni) interface, whereas nickel-stainless (Ni/SS) interface free intermetallic phases for all joints. Chemical composition reaction layers determined by energy dispersive spectroscopy (SEM–EDS) confirmed X-ray diffraction study. Maximum tensile strength ~382 along with ~3.7 pct ductility observed joints processed 60 It found that extent zone Ni/SS greater than TiA/Ni interface. From microhardness profile, fractured surfaces, fracture path, it demonstrated failure initiated propagated apparently near less 90 minutes, through Ni greater.