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Vacancy migration energy dependence on local chemical environment in Fe-Cr alloys: A Density Functional Theory study
KTH, School of Engineering Sciences (SCI), Physics, Reactor Physics. Etude et Modelisation des Microstructures Pour le Vieillissement des Materiaux, France .ORCID iD: 0000-0002-2381-3309
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2014 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 452, no 1-3, 425-433 p.Article in journal (Refereed) Published
Abstract [en]

The first step towards the understanding and the modelling of the Fe-Cr alloy kinetic properties consists in estimating the migration energies related to the processes that drive the microstructure evolution. The vacancy's migration barrier is expected to depend on the vacancy-migrating atom pair atomic environment as pointed out by Nguyen-Manh et al. or Bonny et al. In this paper, we address the issue of the dependence on the vacancy's local atomic environment of both the vacancy migration energy and the configurational energy change Delta E that occurs when the vacancy jumps towards one of its nearest neighbour sites. A DFT approach is used to determine the ground state energy associated to a given configuration of the system. The results are interpreted in the light of the chromium-chromium and chromium-vacancy binding energies as well as the substitutional chromium atoms magnetic properties.

Place, publisher, year, edition, pages
2014. Vol. 452, no 1-3, 425-433 p.
Keyword [en]
Atoms, Binding energy, Chromium alloys, Microstructure
National Category
Other Materials Engineering
URN: urn:nbn:se:kth:diva-149495DOI: 10.1016/j.jnucmat.2014.05.007ISI: 000339657200061ScopusID: 2-s2.0-84902665711OAI: diva2:740089
EU, FP7, Seventh Framework Programme, 212175

QC 20140822

Available from: 2014-08-22 Created: 2014-08-22 Last updated: 2014-08-22Bibliographically approved

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Olsson, Pär
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