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Experimental and theoretical study of tracer diffusion in a series of (CoCrFeMn) 100− xNix alloys

J. Kottke, D. Utt, M. Laurent-Brocq, A. Fareed, D. Gaertner, L. Perrière, Ł. Rogal, A. Stukowski, K. Albe, S. Divinski, G. Wilde

Acta Materialia, 194, 236-248, (2020)

DOI: 10.1016/j.actamat.2020.05.037

Download: BibTEX

Tracer diffusion of all constituting elements is studied at various temperatures in a series of (CoCrFeMn)100-xNix 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.

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{"type":"article", "name":"j.kottke20208", "author":"J. Kottke and D. Utt and M. Laurent-Brocq and A. Fareed and D. Gaertner and L. Perrière and Ł. Rogal and A. Stukowski and K. Albe and S. Divinski and G. Wilde", "title":"Experimental and theoretical study of tracer diffusion in a series of (CoCrFeMn) 100− xNix alloys", "journal":"Acta Materialia", "volume":"194", "OPTnumber":"", "OPTmonth":"8", "year":"2020", "OPTpages":"236-248", "OPTnote":"", "OPTkey":"high entropy alloy; diffusion Bulk diffusion; KMC: Random alloy model; tracer diffusion measurement", "DOI":"10.1016/j.actamat.2020.05.037"}
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