Diffusion processes in the FeNi system

Abstract In this paper we present the experimental results of a study on the self-diffusion coefficients of both components in the f.c.c. phase of the FeNi binary system; these results were obtained using the radioisotopes 59 Fe and 63 Ni together with the measurements of the interdiffusion coefficient in this system obtained with the aid of an electron micro-analyser. Diffusion measurements were supplemented by thermodynamic mixing data for the same phase measured by the vapour pressure technique; the two sets of data enabled us to verify Darken's theory of interdiffusion. Experimental results of 185 W impurity diffusion in the f.c.c. phase of the FeNi system are also presented.