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Title: Helium bubbles in Fe: equilibrium configurations and modification by radiation
Authors: Gai, Xiao
Smith, Roger
Kenny, Steven D.
Keywords: He
Radiation effects
Fe
Issue Date: 2013
Publisher: © Materials Research Society. Published by Cambridge University Press.
Citation: GAI, 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.
Abstract: 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.
Description: This 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
Sponsor: This work was carried out with the support by EPSRC’s PROMINENT project.
Version: Accepted for publication
DOI: 10.1557/opl.2013.198
URI: https://dspace.lboro.ac.uk/2134/19684
Publisher Link: http://dx.doi.org/10.1557/opl.2013.198
ISSN: 0272-9172
Appears in Collections:Published Articles (Maths)
Published Articles (Materials)

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