Impurity and interdiffusion coefficients of the Cr–X (X = Co, Fe, Mo, Nb, Ni, Pd, Pt, Ta) binary systems

Abstract

Composition profiles of eight Cr–X (X=Co, Fe, Mo, Nb, Ni, Pd, Pt, Ta) binary systems are collected from diffusion multiples from which composition-dependent interdiffusion coefficients for all the phases in these eight binary systems are extracted using a forward-simulation method. Very strong composition dependency of the interdiffusion coefficients is observed in the Cr-rich bcc phase of the Cr–Co, Cr–Fe, Cr–Ni and Cr–Pt systems. Impurity diffusion coefficients are also extracted using the forward-simulation method and are compared with data reported in the literature. The good agreement between data obtained from the current study and those reported in the literature serves as a validation of the forward-simulation method in extracting both interdiffusion and impurity diffusion coefficients.