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Via solid–solid diffusion couples, electron probe microanalysis and the Whittle and Green method, interdiffusivities in fcc Al–Cu–Mn alloys at 1123 K were measured. The reliability of the obtained diffusivities is validated by comparing the computed diffusivities with literature data plus constraints among the diffusivities. Through assessments of experimentally determined diffusion coefficients by means of a diffusion-controlled transformations simulation package, the atomic mobilities of Al, Cu, and Mn in fcc Al–Cu–Mn alloys are obtained. Comprehensive comparisons between the model-predicted and the experimental data indicate that the presently obtained atomic mobilities can reproduce most of the diffusivities, concentration profiles, and diffusion paths reasonably.

Diffusivities and atomic mobilities in Cu-rich fcc Al–Cu–Mn alloys