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Download fileHelium bubbles in Fe: equilibrium configurations and modification by radiation
journal contribution
posted on 2015-11-30, 14:17 authored by Xiao Gai, Roger Smith, Steven KennySteven KennyWe 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.
Funding
This work was carried out with the support by EPSRC’s PROMINENT project.
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