Application of binary interdiffusion models to γ′(Ni3Al)/γ(Ni) diffusion bonded interfaces

Abstract Nickel and Ni 3 Al platelets have been joined by diffusion solid state bonding with two different sets of bonding parameters (applied pressure, temperature, duration). The γ/γ′ interfaces obtained are examined and the transverse concentration profiles are determined. The application of the classical binary interdiffusion models to this particular case is discussed, with increasingly refined hypotheses. A step-by-step numerical calculation procedure is finally proposed which is able to account correctly for the measured profiles at the highest annealing temperature (1100°C). To apply this procedure an experimental determination of the interdiffusion coefficients of Al in the phases γ and γ′ as functions of the local concentration was made according to Matano's method.