Simulations of the effects of 1-d interstitial diffusion on void lattice formation during irradiation |
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Authors: | J H Evans |
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Institution: | 1. CEA, DEC, 13108 Saint-Paul-Lez-Durance, France.guillaume.martin@cea.fr;3. CEA, DEC, 13108 Saint-Paul-Lez-Durance, France.;4. CEA, IRAMIS, LEEL, 91191 Gif-sur-Yvette, France.;5. Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France. |
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Abstract: | This paper describes the use of simulation techniques to examine some of the processes involved in the alignment of voids under the influence of one-dimensional self interstitial atom (1-d SIA) transport. The work follows the paper of Heinisch and Singh on this topic but a different and simpler methodology is used. Besides repeating the scenarios studied by Heinisch and Singh, the effects of re-nucleation and the influence of vacancies have been introduced. One of the important processes that emerged from the results was the barrier to precise void alignment caused by the SIA-induced coalescence of aligned voids. This appears to prevent the formation of stable void lattices by any 1-d SIA transport mechanism, a point supported by the initial void alignment in the mechanism requiring swelling values well above those found experimentally. A full consideration of the void lattice phenomenon shows that the one-dimensional diffusion of self-interstitials central to the production bias model of irradiation damage cannot be the only mode of anisotropic diffusion available under irradiation. |
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Keywords: | ion-beam analysis carbides nuclear materials oxidation |
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