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Entropy-dominated grain boundary segregation

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Abstract

The phenomenon of entropy-dominated grain boundary segregation is introduced and discussed. Numerous examples of the grain boundaries and solutes exhibiting this phenomenon are compiled and predicted for example of α-iron-based alloys and other host materials. Consequences of entropy-dominated grain boundary segregation for grain size stabilization and intergranular embrittlement are shown.

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Data availability

The data sets generated and/or analyzed in the present study are available from the corresponding author on reasonable request.

Notes

  1. The product \(T \times {\text{ln}}X_{I}^{*} \left( T \right)\) is independent of temperature in the ideal case.

  2. Using the value ΔHI = – 92 kJ mol–1 referred in [31] which implies the value ΔSI = – 97 J mol–1 K–1 [21], two times larger difference of the values of ΔσI is obtained.

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Acknowledgements

Financial support was provided by the Czech Science Foundation (Project No. GA-20-08130S), by the Ministry of Education, Youth and Sports of the Czech Republic (CEITEC 2020-Project No. LQ1601), and by the Academy of Sciences of the Czech Republic (RVO:68378271).

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Authors and Affiliations

  1. Central European Institute of Technology, CEITEC BUT, Brno University of Technology, Purkyňova 123, 616 69, Brno, Czech Republic

    P. Lejček

  2. Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21, Praha 8, Czech Republic

    P. Lejček

  3. Max-Planck-Institute for Intelligent Systems (Formerly MPI for Metals Research), Heisenberg Str. 3, 70569, Stuttgart, Germany

    S. Hofmann

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  1. P. Lejček
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Correspondence to P. Lejček.

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Lejček, P., Hofmann, S. Entropy-dominated grain boundary segregation. J Mater Sci 56, 7464–7473 (2021). https://doi.org/10.1007/s10853-021-05800-w

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