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Thermodynamic stability of binary nanocrystalline alloys: analysis of solute and excess vacancy

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Abstract

Regarding that the excess volume in grain boundaries (GBs) is released as the vacancies which are accommodated by the crystal bulk during grain growth, a free-energy function for binary nanocrystalline solid solution is proposed, based on the pairwise nearest-neighbor interactions. The model, for the given composition and temperature, predicts an equilibrium grain size, subjected to a mixed effect due to solute segregation and due to excess vacancies. Furthermore, excess-vacancy-inhibited grain coarsening can be attained, which plays a minor role in holding the thermal stability of nanocrystalline alloys, as compared to the effect of solute segregation.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, P.R. China

    M. M. Gong, F. Liu & K. Zhang

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  1. M. M. Gong
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  2. F. Liu
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  3. K. Zhang
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Correspondence to F. Liu.

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Gong, M.M., Liu, F. & Zhang, K. Thermodynamic stability of binary nanocrystalline alloys: analysis of solute and excess vacancy. Appl. Phys. A 105, 927–934 (2011). https://doi.org/10.1007/s00339-011-6501-2

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  • DOI: https://doi.org/10.1007/s00339-011-6501-2

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