Interdiffusion behavior of Ti-Mo binary system in β phase

The interdiffusion behavior of Ti-Mo binary system in the β-phase was investigated in the temperature range of 950-1050°C by using Ti-Mo binary system as diffusion couple. The interdiffusion coefficients were calculated with Den Broeder's method from the concentration profiles of Mo element determined by EPMA. The Hall method was used to determine the interdiffusion coefficients at the Ti-rich and Zr-rich sides. The results show that the interdiffusion coefficients depend strongly on the concentration. These coefficients are compared with the impurity diffusion coefficients which are determined by Vignes-Birchenall equation. The activation energy and frequency factor were calculated by Arrhenius equation at different concentrations, the maximum values of the two parameters appear at y(Mo)≈35%.