This system was chosen, for the study of diffusion in ternary metallic systems, because of its experimental and thermodynamic simplicity. The concentration profiles and diffusion paths in single-phase areas, and across an / interface, were studied experimentally at 1000C by using a diffusion couple technique. The interdiffusion and tracer diffusion coefficients were calculated at the intersection points of 2 independent diffusion paths with a common composition. The concentration dependences were calculated for the tracer diffusion coefficients for each component and were found to be consistent with published data on the Cu-Ni and Fe-Ni binary systems. It was found that the calculated vacancy flux in the couples was consistent with the experimentally observed marker shift.

K.J.Rönkä, A.A.Kodentsov, P.J.J.Van Loon, J.K.Kivilahti, F.J.J.Van Loo: Metallurgical and Materials Transactions A, 1996, 27[8], 2229-38