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Helium bubbles in Fe: equilibrium configurations and modification by radiation
journal contributionposted on 2015-11-30, 14:17 authored by Xiao Gai, Roger Smith, Steven KennySteven Kenny
We have examined the properties of helium bubbles in Fe using two different Fe-He potentials. The atomic configurations and formation energies of different He-vacancy complexes are determined and their stability in the region of nearby collision cascades is investigated. The results show that the optimal He to Fe vacancy ratio increases from about 1:1 for approximately 5 vacancies up to about 4:1 for 36 vacancies. Collision cascades initiated near the complex show that Fe vacancies produced by the cascades readily become part of the He-vacancy complexes. The energy barrier for an isolated He interstitial to diffuse was found to be 0.06 eV. Thus a possible mechanism for He bubble growth would be the addition of vacancies during a radiation event followed by the subsequent accumulation of mobile He interstitials produced by the corresponding nuclear reaction. © 2013 Materials Research Society.
This work was carried out with the support by EPSRC’s PROMINENT project.
- Mathematical Sciences
Published inMaterials Research Society Symposium Proceedings
Pages21 - 26
CitationGAI, X, SMITH, R. and KENNY, S.D., 2013. Helium bubbles in Fe: Equilibrium configurations and modification by radiation. Materials Research Society Symposium Proceedings, 1514, pp. 21-26.
Publisher© Materials Research Society. Published by Cambridge University Press.
- AM (Accepted Manuscript)
Publisher statementThis work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
NotesThis paper was accepted for publication in the journal MRS Online Proceedings Library and the definitive published version is available at http://dx.doi.org/10.1557/opl.2013.198