Thermodynamic Calculation of Phase Equilibria in Ta-added Co-Cr Base Alloy Films.

It is known that the structures of a Co-Cr base alloy film consist of a Co base ferromagnetic phase in grains and a Cr base paramagnetic phase in the neighborhood of the grain boundary. It has been reported that this structure is caused by a miscibility gap on magnetic transformation. The miscibility gap on magnetic transformation of the Co-Cr binary phase diagram has already been calculated, by the CALPHAD method. However, the miscibility gap on the magnetic transformation of a Ta-added Co-Cr base alloy has not yet been calculated. In this paper, therefore, we calculate the miscibility gap on the magnetic transformation of a Ta-added Co-Cr base alloy by the CALPHAD method.