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Recent trends and open questions in grain boundary segregation

Published online by Cambridge University Press:  26 July 2018

Pavel Lejček ,
Monika Všianská  and
Mojmír Šob
Pavel Lejček*
Affiliation:
Institute of Physics, Academy of Sciences of the Czech Republic, 182 21 Praha 8, Czech Republic
Monika Všianská
Affiliation:
Central European Institute of Technology, Masaryk University, CEITEC MU, 625 00 Brno, Czech Republic; Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 616 62 Brno, Czech Republic; and Department of Chemistry, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
Mojmír Šob
Affiliation:
Central European Institute of Technology, Masaryk University, CEITEC MU, 625 00 Brno, Czech Republic; Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 616 62 Brno, Czech Republic; and Department of Chemistry, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
*
a)Address all correspondence to this author. e-mail: lejcekp@fzu.cz
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Abstract

Recently, significant progress in the field of grain boundary segregation was achieved, for example, in better understanding and modeling the stabilization of nanocrystalline structures by grain boundary segregation, searching for more advanced approaches to theoretical calculation of segregation energies and development of the complexion approach. Nevertheless, with each progress, new important questions appear which need to be solved. Here, we focus on two basic questions appearing recently: How can be the experimental results on the grain boundary segregation compared reliably to their theoretical counterparts? Is the preferred segregation site of a solute in the grain boundary core substitutional or interstitial? We also show that the entropy of grain boundary segregation is a very important quantity which cannot be neglected in thermodynamic considerations as it plays a crucial role, for example, in prediction of thermodynamic characteristics of grain boundary segregation and in the preference of the segregation site at the boundary.

Keywords

grain boundarieschemical compositionFegrain boundary segregationgrain boundary magnetismthermodynamics
Type
Invited Feature Paper
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2647 - 2660
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

This paper has been selected as an Invited Feature Paper.

References

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