Diffusivities and atomic mobilities in the Al-Ce-Ni melts

The recently developed Arrhenius formula of modified Sutherland equation was applied to calculate the self- and impurity diffusivities in liquid Al, Ce and Ni. Based on the measured tracer and chemical diffusivities available in the literature together with the reliable thermodynamic parameters of the liquid phase in the Al-Ce-Ni system and the atomic mobilities of binary Al-Ni melts, the atomic mobilities in Al-Ce-Ni melts were evaluated using the DICTRA (diffusion-controlled transformations) software package. Comprehensive comparisons between the calculated results and the experimentally measured data show that most of the diffusivities from different sources can be well reproduced by the atomic mobilities obtained in the present work. The atomic mobilities were further verified by comparing the model-predicted concentration profiles and the measured ones in two liquid Al-Ce-Ni diffusion couples.