Experimental and theoretical study of tracer diffusion in a series of (CoCrFeMn)100−xNix alloys. (1st August 2020)

• Record Type: Journal Article
• Authors: Kottke, Josua; Utt, Daniel; Laurent-Brocq, Mathilde; Fareed, Adnan; Gaertner, Daniel; Perrière, Loïc; Rogal, Łukasz; Stukowski, Alexander; Albe, Karsten; Divinski, Sergiy V.; Wilde, Gerhard
• Is Part Of: Acta materialia. Volume 194(2020)
• Page Start: 236
• Page End: 248
• Publication Date: 2020-08-01
• Subjects: High entropy alloy -- Diffusion -- Bulk diffusion -- KMC: Random alloy model -- Tracer diffusion measurement; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2020.05.037
• Languages: English
• ISSNs: 1359-6454

Abstract

Graphical abstract: Abstract: 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.