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- W3180097916 abstract "Due to the randomness in the local atomic environment, the vacancy formation energy in concentrated solid-solution alloys exhibits substantial variations. While the variations have often been attributed to the local composition in the first nearest neighbor (1NN) shell, large variations are seen to persist even when the 1NN compositions are fixed, indicating contributions of other factors. In this study, extensive density functional theory calculations are carried out on two different special quasi-random structures (SQSs) in Fe70Ni10Cr20, each consisting of 256 atoms, to investigate the contributions of various factors that may influence the vacancy formation energy. We observe that the vacancy formation energy is dependent on not only the 1NN composition but also equally the arrangement of 1NN atoms. In particular, we find that the vacancy formation energy can vary up to 0.44 eV even if the composition of the 1NN is fixed and only the relative positions of the twelve 1NN atoms are exchanged. Further, we find that the atomic relaxation and volume of a vacancy before and after vacancy formation can also significantly influence the vacancy formation energy. Finally, we find a negligible influence of second nearest neighbors and their arrangement on the vacancy formation energy." @default.
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- W3180097916 date "2021-10-01" @default.
- W3180097916 modified "2023-09-27" @default.
- W3180097916 title "Factors affecting the vacancy formation energy in Fe70Ni10Cr20 random concentrated alloy" @default.
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- W3180097916 doi "https://doi.org/10.1016/j.commatsci.2021.110669" @default.
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