Abstract
In the present investigation, the evolution of interface microstructure and mechanical properties of diffusion bonded joints of titanium to Type 304 stainless steel with a niobium interlayer were studied. The joints were processed in the temperature range of 800 to 1000°C for 0.5 h in vacuum. The stainless steel/niobium interface was free from intermetallic phase up to 900°C; however, Fe2Nb+Fe7Nb6 phase mixture was observed at and above a processing temperature of 950°C. The niobium/titanium interface was free from intermetallic compounds at all processing temperatures. A maximum tensile strength of 297 MPa (~93% of Ti) and shear strength of 217 MPa (~75% of Ti) along with a 6.9% ductility were achieved, when processed at 900°C processing temperature. The failure of bonded samples took place through the stainless steel–niobium interface at all processing temperatures during loading.
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