Helium Bubbles in Fe: Equilibrium Configurations and Modification by Radiation


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.

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Correspondence to Xiao Gai.

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Gai, X., Smith, R. & Kenny, S. Helium Bubbles in Fe: Equilibrium Configurations and Modification by Radiation. MRS Online Proceedings Library 1514, 21 (2013). https://doi.org/10.1557/opl.2013.198

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