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Complex, concentrated, multi-component alloys have been shown to displayoutstanding thermo-mechanical properties, that have been typically attributedto sluggish diffusion, entropic, and lattice distortion effects. Here, weinvestigate two metal alloys with such exemplary properties, the equiatomic,single-phase, face-centered-cubic (FCC) alloys NiCoCr and NiCoCrFeMn, and wecompare their microstructural kinetics to the behaviors in a pure-Ni FCC metal.We perform long-time, kinetic Monte Carlo (kMC) simulations, and we analyze indetail the kinetics of atomic vacancies. We find that vacancies in bothconcentrated alloys exhibit subdiffusive thermally driven dynamics, in directcontrast to the diffusive dynamics of pure Ni. Subdiffusive dynamics shall beattributed to dynamical sluggishness, that is modeled by a fractional Brownianrandom walk. Furthermore, we analyze the statistics of waiting times, and weinterpret long power-law-distributed rest periods as a direct consequence ofbarriers' energy-scales and lattice distortions.

Multiscale modeling of kinetic sluggishness in equiatomic NiCoCr and NiCoCrFeMn single-phase solid solutions