Self-diffusion in carbon-alloyed CoCrFeMnNi high entropy alloys

Tracer diffusion of the substitutional components in interstitial (CoCrFeNiMn)1-xCx high-entropy alloys with nominally 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 carbon addition on these FCC are distinguished. At highest temperature K, alloying by C relatively low concentrations (x 0.002) retards elements respect those C-free alloy. lower and/or higher ? 0.005), an enhancement rates all seen. A model suggested that relates self-diffusivities CoCrFeMnNi–C lattice distortion imposed interstitially dissolved carbon. The experimental results interpreted terms a decrease migration barriers for vacancy-mediated due presence atoms.