Helium bubble growth at BCC twist grain boundaries

► We model He bubbles in α-Fe at twist grain boundaries and bulk using MD. ► We study the pressures and volumes of the helium bubbles. ► The pressure of a bubble is lower at the twist boundary than in bulk. ► Interstitial loops are formed in all cases but are trapped at a twist boundary. ► The maxim...

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Bibliographic Details
Published in:Journal of nuclear materials 2011-12, Vol.419 (1), p.201-207
Main Authors: Hetherly, J., Martinez, E., Nastasi, M., Caro, A.
Format: Article
Language:English
Subjects:
Applied sciences
Controled nuclear fusion plants
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Fuels
Installations for energy generation and conversion: thermal and electrical energy
nuclear (including radiation effects), defects, mechanical behavior, materials and chemistry by design, synthesis (novel materials), synthesis (scalable processing)
Nuclear fuels
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Summary:► We model He bubbles in α-Fe at twist grain boundaries and bulk using MD. ► We study the pressures and volumes of the helium bubbles. ► The pressure of a bubble is lower at the twist boundary than in bulk. ► Interstitial loops are formed in all cases but are trapped at a twist boundary. ► The maximum density for the bubbles is found to be 1.7 He/Vac Fe. We study the growth of helium bubbles in α-Fe at low angle twist grain boundaries and in bulk using molecular dynamics and Metropolis Monte Carlo simulations. We describe the pressures and volumes of the helium bubbles and analyze the maximum pressure a bubble can sustain before emitting interstitial loops. We give a quantitative analysis of how these emitted loops behave differently in the bulk and at the grain boundary.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2011.08.009