Abstract
On the basis of three groups of Ti/Ti-10 at.% Ga and Ti/Ti-7 at.% Cu diffusion couples, respectively, interdiffusion coefficients in the bcc Ti-Ga and Ti-Cu binary alloys in the temperature range of 1273-1573 K were evaluated by means of the den Broeder method. Based on various reported experimental and the present measured diffusion coefficients as well as the available thermodynamic information, accurate atomic mobilities in the bcc Ti-Ga and Ti-Cu alloys were assessed via the DICTRA simulation package. A semi-empirical correlation was employed in the present work for the self-diffusivities in the hypothetical bcc Ga and Cu. Comparision between the calculated and measured diffusion coefficients indicated that most of the experimental information can be reasonably reproduced. The developed diffusion mobilities were further validated by the prediction of the concentration-distance profiles.
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