Metals

Grain boundary sliding in bicrystals of CoNiCrFeMn alloy: atomistic Md/Mc modeling

I. N. Kar'kin, L. E. Kar'kina, Yu. N. Gornostyrev

Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: The effect of grain boundary segregations in equiatomic high-entropy (HEA) CoNiCrFeMn alloy during annealing at moderate temperatures on grain boundary sliding was studied using atomistic modeling. It is shown that in the state of a solid solution during grain boundary sliding, the alloy behaves qualitatively similarly to a pure fcc metal, including the implementation of the easiest mechanism of sliding and migration along grain boundaries. The formation of a segregation layer on the GB during annealing has a multidirectional effect on the sliding mechanisms along special GBs of inclination $\Sigma5$. The effect of HEA annealing on the stability of the grain boundary ensemble is discussed.

Keywords: high entropy alloys, segregations, grain boundaries, atomistic modeling, grain boundary sliding.

Received: 07.06.2025
Revised: 19.07.2025
Accepted: 20.07.2025

DOI: 10.61011/FTT.2025.08.61309.159-25

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