To validate the ‘sluggish diffusion’ in high-entropy alloys

interdiffusion coefficients of individual elements and tracer diffusion coefficient of Ni were experimentally determined in FCC Al

0.25

CoCrFeNi alloy. The tracer diffusion coefficient was determined without the application of radio-tracers using a novel analytical method proposed by Belova et al. based on linear response theory coupled with Boltzmann-Matano approach and Gaussian distribution function. Sluggish diffusion kinetics was not observed in alloys with higher configuration entropy in comparison to alloys with lower configuration entropy. Correspondingly

potential energy fluctuations in alloys with higher configuration entropy may not always result in anomalously slow diffusion kinetics.