Experimental and theoretical study of tracer diffusion in a series of (CoCrFeMn)_100-xNi_x alloys

2020/03/20 by Kottke, Josua, Utt, Daniel, Laurent-Brocq, Mathilde +8 · 1 citation
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)

paper · doi:10.48550/arxiv.2003.09474

Abstract

Tracer diffusion of all constituting elements is studied at various temperatures in a series of (CoCrFeMn)_100-xNi_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.

Cited by

• Lattice distortions and non-sluggish diffusion in BCC refractory high entropy alloys

Related

• Concentration-dependent atomic mobilities in FCC CoCrFeMnNi high-entropy\n alloys
• Self-diffusion in carbon-alloyed CoCrFeMnNi high entropy alloys
• Multiscale modeling of kinetic sluggishness in equiatomic NiCoCr and NiCoCrFeMn single-phase solid solutions
• Master equation approach to the theory of diffusion in alloys and calculations of enhancement factors for tracer solvent and tracer solute diffusion in FCC alloys
• Radioactive isotopes reveal a non sluggish kinetics of grain boundary diffusion in high entropy alloys