Diffusion Mobilities in fcc Cu-Au and fcc Cu-Pt Alloys

Abundant diffusion data in binary fcc Cu-Au and fcc Cu-Pt alloys have been assessed to obtain the atomic diffusion mobilities of fcc Cu-Au and fcc Cu-Pt alloys by the CALPHAD method. The obtained mobilities are expressed as functions of compositions and temperatures. Good agreements are obtained from comprehensive comparisons between the calculated and experimentally measured self-diffusion coefficients, impurity diffusion coefficients, tracer diffusion coefficients, interdiffusion coefficients, and concentration curves. Accordingly, the developed mobility parameters, in conjunction with the CALPHAD-type thermodynamic descriptions, can be used to simulate diffusion behaviors at high temperatures. It is believed that the results of this work contribute to the design of a general Cu mobility database.