The interdiffusion behavior of ternary face-centered-cubic (fcc) Al-Co-Cr alloys has been studied by the diffusion-couple technique and CALculation of PHAse Diagram (CALPHAD) approach. The composition profiles of the fcc Al-Co-Cr diffusion couples at 1000 and 1200 °C were measured by using electron probe microanalysis (EPMA), followed by the extraction of interdiffusion coefficients through the Whittle-Green method. Based on the available thermodynamic description and diffusion coefficients in the literature as well as the experimental data obtained in the present work, the atomic mobilities of Al, Co, and Cr in fcc Al-Co-Cr alloys were assessed by means of the CALPHAD method. The diffusion coefficients, composition profiles and diffusion paths of fcc Al-Co-Cr alloys were calculated by adopting the atomic mobilities assessed in the present work, reaching a good agreement with the experimental data. [ABSTRACT FROM AUTHOR]