Calculating the composition-dependent diffusivity matrix along a diffusion path in ternary systems: Application to β-(Ni, Pt)Al

A numerical inverse analysis has been developed to extract the composition-dependent interdiffusion coefficients from a single diffusion couple in ternary systems. Its application to various diffusion couples at 1100 ∘C in β-(Ni, Pt)Al shows that in the composition domain investigated: rect interdiffusion coefficient DAlAlNi increases as the platinum content increases. entration gradient of platinum has no influence on the diffusion of aluminium, and the corresponding coefficient DAlPtNi is zero. oss coefficient DPtAlNi is constant and very small except for a deep minimum at an aluminium content of 50 at.%. results are briefly discussed in relation with diffusion mechanisms in β-(Ni, Pt)Al.