The solid state diffusion bonding of the Ti–6Al–4V alloy was carried out in inert gas environment and the oxidation behavior at high temperatures was investigated. Bonding was conducted in a furnace using selected combinations of temperature ranging from 850 to 950C, pressure of 3MPa for 1 to 3h in Ar. Good diffusion bonding interface were observed at relatively low temperature and pressure. The microstructure bonded at 900C exhibited O-enriched α-phase at the bonded interface. It was shown that at the optimum condition for diffusion bonding with parent metal, the oxide film became unstable and the O diffused into the bulk. The evidence of nucleation of new grains and microhardness properties at the interface proves the diffusion bonding process was successful.

Oxidation Behavior of Titanium Alloy under Diffusion Bonding. H.S.Lee, J.H.Yoon, Y.M.Yi: Thermochimica Acta, 2007, 455[1-2], 105-8