Microstructural evolution of uranium dioxide following compression creep tests: An EBSD and image analysis study

Abstract : Sintered UO2 pellets with relatively large grains (similar to 25 pm) are tested at 1500 degrees C under a compressive stress of 50 MPa, at different deformation levels up to 12%. Electron Back Scattered Diffraction (EBSD) is used to follow the evolution, with deformation, of grains (size, shape, orientation) and sub-grains. Image analyses of SEM images are performed to characterize emergence of a population of micron size voids. For the considered microstructure and test conditions, the results show that the deformation process of UO2 globally corresponds to grain boundary sliding, partly accommodated by a dislocational creep within the grains, leading to a highly sub-structured state.
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X. Iltis, Nathalie Gey, C. Cagna, Alain Hazotte, Ph. Sornay. Microstructural evolution of uranium dioxide following compression creep tests: An EBSD and image analysis study. Journal of Nuclear Materials, Elsevier, 2015, 456, pp.426-435. ⟨10.1016/j.jnucmat.2014.10.005⟩. ⟨hal-01514736⟩

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