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Tracer diffusion of the substitutional components in(CoCrFeNiMn)$_{1-x}$C$_x$ high-entropy alloys with x = 0.002, 0.005 and 0.008(in at. fractions) is measured at elevated temperatures from 1173 to 1373 K.Two different characteristic effects of interstitial carbon addition onsubstitutional diffusion in these FCC alloys are distinguished. At the highesttemperature of 1373 K, alloying by C with relatively low concentrations (x =0.002) retards diffusion of the substitutional elements with respect to thosein the C-free alloy. At lower temperatures and/or higher C concentrations (x >0.005), an enhancement of the diffusion rates of all substitutional elements isseen. A model is suggested that relates the self-diffusivities in theCoCrFeMnNi-C alloys with the lattice distortion imposed by interstitiallydissolved carbon. The experimental results are interpreted in terms of adecrease of the migration barriers for vacancy-mediated diffusion due to thepresence of interstitial C atoms.

Self-diffusion in carbon-alloyed CoCrFeMnNi high entropy alloys