A new method was presented for determining the average values of the main interdiffusion, and cross-interdiffusion, coefficients within selected compositional ranges; all on the basis of the concentration profiles in an isothermal ternary diffusion couple. The method involved the integration of the interdiffusion fluxes over selected regions within the diffusion zone, and it was applied to selected isothermal diffusion couples in the Cu-Ni-Zn and Fe-Ni-Al systems. The technique was also extended so as to examine interdiffusion in a ternary alloy under a temperature gradient. The extended analysis was used to determine interdiffusion coefficients and thermotransport coefficients, as well as the diffusion flux contributions which arose from the gradients of temperature and concentration in a U-Pu-Zr alloy that was subjected to a temperature gradient.

An Analysis for Interdiffusion Coefficients and Thermotransport Coefficients in Isothermal and Nonisothermal Ternary Diffusion. M.A.Dayananda, Y.H.Sohn: Solid State Phenomena, 2000, 72, 99-104