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- W2024057476 abstract "The mechanism of structural transition in nanocrystalline metals was studied from a thermodynamic point of view. Crystal lattice distortion and interfacial effect were found to be the reasons for structural instability. Nanocrystalline Fe samples prepared by the milling method and by the crystallization method were used for analyses and comparison. The contributions of lattice distortion and interfacial energy to thermodynamics were calculated using the quasiharmonic Debye approximation and the Gibbs-Thomson equation, respectively. By examining the change in Gibbs free energy and considering the effect of negative stress of grain boundaries on the crystal volume change in structural transition, we calculated the critical grain size of fcc-Fe formation. Results show that relative to the crystallized nanocrystalline state, it is more likely that the fcc Fe forms in the milled nanocrystalline state. Whether or not the phase transition occurs in nanocrystalline materials is closely related to the preparation technology, the grain-boundary structure, and the grain size." @default.
- W2024057476 created "2016-06-24" @default.
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- W2024057476 date "2007-12-15" @default.
- W2024057476 modified "2023-09-23" @default.
- W2024057476 title "Phase stability in nanocrystalline metals: A thermodynamic consideration" @default.
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- W2024057476 doi "https://doi.org/10.1063/1.2822473" @default.
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