  Interdiffusion study is conducted in the Ni-rich part of the beta-Ni(Pt)Al
phase following the pseudo-binary approach. Interdiffusion coefficients over
the whole composition range considered in this study increases with the
increase in Pt content, which is in line with the theoretical study predicting
the decrease in vacancy formation and migration energy because of Pt addition.
The trend of change in diffusion coefficient with the increase in Ni and Pt
content indicates that Pt preferably replaces Ni antisites.
