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Helium Bubbles in Fe: Equilibrium Configurations and Modification by Radiation

Published online by Cambridge University Press:  21 February 2013

Xiao Gai ,
Roger Smith  and
Steven Kenny
Xiao Gai
Affiliation:
Mathematical Sciences Department, Loughborough University, Leicestershire, LE11 3TU, UK
Roger Smith
Affiliation:
Mathematical Sciences Department, Loughborough University, Leicestershire, LE11 3TU, UK
Steven Kenny
Affiliation:
Mathematical Sciences Department, Loughborough University, Leicestershire, LE11 3TU, UK
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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.

Keywords

Heradiation effectsFe
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1514: Symposium HH – Advances in Materials for Nuclear Energy , 2013 , pp. 21 - 26
Copyright
Copyright © Materials Research Society 2013 

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References

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