An analysis of diffusion paths in single-phase ternary metal systems Co-Fe-Ni and Cu-Fe-Ni on the basis of the phenomenological interdiffusion model using effective interdiffusion coefficients is presented. The peculiarities of practical application of effective interdiffusion coefficients of components for calculating diffusion paths in ternary systems are analysed. It is done on the basis of the relationship between effective interdiffusion coefficients and the diffusion paths. The results were found to be in good agreement with experimental data for the ternary systems Co-Ni-Fe and Cu-Ni-Fe. It is shown that deviation of the diffusion path from linearity in ternary single-phase diffusion couple in the system Cu-Ni-Fe mainly depends on the thermodynamic properties of the system.
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