Assessment of atomic mobilities in fcc Al-Zn and Ni-Zn alloys

Based on critical review of interdiffusivities, tracer diffusivities and impurity diffusivities available in the literature, atomic mobilities of fcc Al-Zn and Ni-Zn alloys are evaluated by means of the DICTRA software. A comprehensive comparison between the calculated diffusivities and the measured ones, as well as that between the model-predicted concentration profiles and the experimental ones, indicates that the presently obtained atomic mobilities are reliable. It is demonstrated that with fewer adjustable parameters, the presently calculated diffusivities and concentration profiles in fcc Al-Zn alloys yield a comparably good fit to the experimental ones, in comparison with the previous assessment.