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Compréhension de l'origine de l'évolution sous irradiations de la ténacité des verres nucléaires

Le Hai Kieu 1 
1 LMPA - Laboratoire des Matériaux et Procédés Actifs
DE2D - Département de recherche sur les technologies pour l'enrichissement, le démantèlement et les déchets : DES/ISEC/DE2D
Abstract : In the nuclear industry, complex borosilicate glasses are used for the confinement of fission products and long-life minor actinides. Under irradiations, the structure and the mechanical properties of these glasses evolve. In this work, atomistic and multi-scale simulations of three simplified borosilicate glasses were run to understand the origin of their fracture behavior change under irradiation. Under the radiation effects, elasticity decreases and plasticity increases. Fracture happens due to the formation and coalescence of nanocavities. The structural modifications under the radiation effects lead to a delay of the coalescence and of the irradiated glass rupture. Several phenomena overlay to explain this behavior, especially the cavities distribution modifications, the sodium mobility, and the borate and silicate entities organization in the glassy network. Depending on the nature of the more important mechanism, the fracture toughness can increase or decrease under radiation.
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Submitted on : Monday, January 16, 2012 - 2:36:14 PM
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Le Hai Kieu. Compréhension de l'origine de l'évolution sous irradiations de la ténacité des verres nucléaires. Mécanique des matériaux [physics.class-ph]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00660352⟩

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