Equilibrium Distribution Coefficients of Solute Elements between Solid and Liquid Phases in Ni-base Multi-component Alloys

Abstract

The equilibrium distribution coefficients, k^X_o, between solid and liquid phases in Ni-base multi-component alloys have been determined by means of the experiment and also the thermodynamic calculation.
The experimental results show that k^X_o's of Ni, Cr, Fe, and Co are almost unchanged for the compositions of alloys, but that k^X_o's of Nb and Ta decrease with increasing Fe and Co contents in both Ni-Cr-Fe-Mo and Ni-Cr-Co-Mo base multi-component alloys. The composition dependence of k^X_o was also obtained by the thermodynamic calculation in which the solute-interations were taken into account.