Thermodynamic Calculation of Phase Equilibria in B-Added Co-Cr Base Alloy Films.

It is known that the structure of a Co-Cr base alloy film consists 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 due to magnetic transformation. The miscibility gap due to magnetic transformation in the Co-Cr binary system has already been calculated by the CALPHAD method. However, the miscibility gap due to the magnetic transformation in a B-added Co-Cr base alloy has not yet been calculated. In this paper, the effect of B-addition on the miscibility gap in a Co-Cr base alloy is calculated by the CALPHAD method.