Interdiffusion in body-centred cubic β-(Ti, Al) solid solution phase

Abstract

A study has been conducted to quantify the effect of Al on diffusion in the dilute β-(Ti, Al) solid solution phase by determining the interdiffusion and impurity diffusion coefficients using the diffusion couple technique. An increase in interdiffusion coefficients with an increase in Al content in β-(Ti, Al) is rationalized by a decreasing trend of activation energy for interdiffusion and an increase in driving force for diffusion. Higher activation energy of impurity diffusion coefficient of Al in β-Ti than that of self-diffusion coefficient of β-Ti may further suggest lower interaction tendency of vacancies with Al atoms in the β-(Ti, Al) phase.