Diffusion behavior and atomic mobilities for fcc Cu–Cr–Ni alloys

•Atomic mobilities of fcc Cu–Cr–Ni phases were determined.•Experimental interdiffusivities were critically evaluated.•Main and cross interdiffusivities show their peculiarities.•The profiles reveal kinetic importance for alloy microstructures.

In this work, diffusion couples of fcc Cu–Cr–Ni alloys annealed at 1373 K for 80 h are investigated. The interdiffusion coefficients are retrieved from common compositions of two diffusion couples, which are then combined with thermodynamic descriptions to explore atomic mobilities of Cu, Cr and Ni in fcc Cu–Cr–Ni alloys within the CALPHAD framework. In order to confirm the quality of such kinetic characteristics, a comparison between calculated and experimentally measured concentration profiles of diffusion couples and diffusion paths in Gibbs triangle is made, where the agreement is excellent. The results of this study contribute to the establishment of a general Ni-based mobility database for alloy design.

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