Journal
ACTA MATERIALIA
Volume 194, Issue -, Pages 236-248Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.05.037
Keywords
High entropy alloy; Diffusion; Bulk diffusion; KMC: Random alloy model; Tracer diffusion measurement
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SPP2006, WI 1899/32-1, STU 611/2-1]
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Tracer diffusion of all constituting elements is studied at various temperatures in a series of (CoCrFeMn)(100-x)Ni-x alloys with compositions ranging from pure Ni to the equiatomic CoCrFeMnNi high-entropy alloy. At a given homologous temperature, the measured tracer diffusion coefficients change non-monotonically along the transition from pure Ni to the concentrated alloys and finally to the equiatomic CoCrFeMnNi alloy. This is explained by atomistic Monte-Carlo simulations based on a modified embedded-atom potentials, which reveal that local heterogeneities of the atomic configurations around a vacancy cause correlation effects and induce significant deviations from predictions of the random alloy model. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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