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Mechanical behaviour near grain boundaries of He-implanted UO 2 ceramic polycrystals

Abstract : For studying the micromechanical behaviour of UO2 and characterising the intergranular interaction, polycrystals are implanted with helium ions, inducing strains in a thin surface layer. Laue X-ray microdiffraction is used to measure the strain field in this implanted layer with a spatial resolution of about 1 micrometer. It allows a 2D mapping of the strain field in a dozen of grains. These measurements show that the induced strain depends mainly on the crystal orientation, and can be evaluated by a semi-analytical mechanical model. A mechanical interaction of the neighbouring grains has also been evidenced near the grain boundaries, which has been well reproduced by a finite element model. This interaction is shown to increase with the implantation energy (i.e. the implantation depth): it can be neglected at low implantation energy (60 keV), but not at higher energy (500 keV).
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Soumis le : mercredi 24 avril 2019 - 16:41:25
Dernière modification le : vendredi 17 juillet 2020 - 17:08:48

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M. Ibrahim, É. Castelier, H. Palancher, Michel Bornert, Sabine Caré, et al.. Mechanical behaviour near grain boundaries of He-implanted UO 2 ceramic polycrystals. Journal of Nuclear Materials, Elsevier, 2017, 483, pp.13-20. ⟨10.1016/j.jnucmat.2016.10.044⟩. ⟨hal-01711377⟩

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