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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S. J. Zinkle, Phys. Plasmas, 12(2005) 058101.
G. Lucas, R. Schäublin, J. Phys.: Condens. Mater, 20(2008) 415206.
R. E. Stoller, S. I. Golubov, P. J. Kamenski, T. Seletskaia, Yu. N. Osetsky, Phil. Mag. 90(2010) 923–934.
F. Gao, Huiqiu Deng, H. L. Heinisch, R. J. Kurtz, J. Nucl. Mater. 418(2011) 115–120.
G. J. Ackland, D. J. Bacon, A. F. Calder and T. Harry, Phil. Mag. A 75(1997) p.713.
G. J. Ackland, M. I. Mendelev, D. J. Srolovitz, S. Han, A. V. Barashev, J. Phys.: Condens. Mater, 16(2004) S2629.
R. A. Aziz, A. R. Janzen, M. R. Moldover, Phys. Rev. Lett. 74(1995) 1586.
M. K. Miller, K. F. Russell, P. Pareige, M. J. Starink, R. C. Thomson, Mater. Sci. Eng. A 250(1998) 49.
P. Auger, P. Pareige, S. Welzel, J-C. van Duysen, J. Nucl. Mater. 280(2000) 331–344.
G. Henkelman, H. Jónsson, J. Chem. Phys. 111(1999) 7010.
C. C. Fu, F. Willaime, Phys. Rev. B 72(2005) 064117.
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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