Rate sensitivity of mechanical properties and fracture characteristics of two-phase titanium alloys subjected to thermal cycles of diffusion welding

Abstract

The effect of strain rate on mechanical properties and fracture characteristics of two dual-phase titanium alloys was studied using standard test equipment. The alloys had been subjected to various thermal cycles, simulating diffusion welding. It is shown that diffusion welding is possible within the alloys β phase region without serious loss of service characteristics provided service temperature and rate of stress application are accounted for. A service temperature (which also depends on loading rate) of between 60 and 100°C is suggested for titanium articles — commensurable in size with that studied — to be diffusion welded in the β region.