Assessment of the diffusional mobilities in bcc Ti–V alloys

The atomic mobilities of Ti and V in bcc Ti–V alloys are critically assessed with respect to temperatures and compositions by the CALPHAD method, where self-diffusion coefficients, impurity diffusion coefficients, tracer diffusion coefficients, interdiffusion coefficients, concentration curves and thermodynamic parameters are employed simultaneously in an optimization process. Comparisons between the calculated and experimentally measured quantities are made. The obtained mobility parameters are used to predict the marker movement behavior, and the result shows a good agreement with the literature information. It is believed that this work contributes to the construction of a general Ti mobility database, which can provide useful guidance for many heat treatment processes.