Mobilities and diffusivities in fcc Co–X (X=Ag, Au, Cu, Pd and Pt) alloys

The mobilities and diffusivities in fcc Co–X (X=Ag, Au, Cu, Pd and Pt) alloys have been critically assessed by the CALPHAD method, based on the reported experimental data and published thermodynamic parameters. The atomic mobilities are expressed as functions of temperature and compositions in the CALPHAD format. Comprehensive comparisons between the calculated and measured diffusivities, such as self-diffusivities, impurity diffusivities, intrinsic diffusivities, and interdiffusivities, are made, where the proposed mobility parameters for Ag, Au, Co, Cu, Pd and Pt enable most of the experimental values to be reproduced. The effect of magnetic ordering on diffusion in fcc Co–Pd and Co–Pt alloys is discussed. This work contributes to the establishment of a Co mobility database, which can aid the computational study of microstructure evolution in Co-based alloys at high temperatures.