Study on the interdiffusion of W–Ti alloy and β phase stability

The composition and microhardness of W/Ti diffusion couple prepared at different temperatures in the sameholding time were analyzed to study the interdiffusion of W–Ti alloy, the W/Ti interdiffusion coefficients were calculated, and the energy and electronic structure of W–Ti binary alloy in the Ti atomic fraction of 12.5%~50% were calculated by MS software. The results show that the diffusion speed of W in Ti is farhigher than the diffusion speed of Ti in W. The W/Ti interdiffusion coefficient equations (unit: cm²·s^-1) at 1100~1300℃ in tungsten and titanium solid solutions are expressed as 2.6×10^-5exp(-385.3/kT) and 4.1×10^-2exp(-285.1/kT), respectively, T is diffusion temperature, k is diffusion distance; the β phase stability of W–Ti alloy decreases monotonously with the increasing of Ti content.