Assessment of the diffusional mobilities in the face-centred cubic Au–Ni alloys

Based on the available thermodynamic information and diffusion coefficient data of the Au–Ni system, the atomic mobility of Au and Ni in face-centred cubic (fcc) Au–Ni alloys has been assessed as a function of temperature and composition in terms of the CALPHAD method. Optimized mobility parameters are presented. Comparisons between the calculated and measured diffusion coefficients show that most of the experimental information can be satisfactorily reproduced in the present work. The obtained mobility parameters can also predict a reasonable concentration profile of the diffusion zone in a binary Au–Ni diffusion couple.