Comparison of experimental and simulated multicomponent Ni-base superalloy diffusion couples

A multicomponent diffusion mobility database for the Ni-rich fcc phase [2002 Cam] is evaluated by comparing diffusion simulations to two experimental multicomponent Ni-base superalloy diffusion couples: Ni/René-88 and IN718/René-88. The diffusion simulations use composition-dependent thermodynamic and diffusion quantities within a finite difference code to simulate single-phase and multiphase planar layers. The multiphase layers consist of a matrix phase and a disperse phase. The calculated composition profiles, interdiffusion coefficients, phase fraction profiles, and location of Kirkendall porosity are compared with experimental results. To treat diffusion in the IN718 alloy, iron and carbon are added to the existing diffusion mobility database using previous assessment work and new assessments of Fe-Al and Fe-Co.

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