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Évaluation du comportement sous irradiation de Ti3SiC2 : Étude de l'endommagement structural et microstructural

Abstract : Among the six new systems of nuclear reactors considered by Generation IV International Forum ; the gas fast reactor is studied in France. Its working conditions (both high temperature and pressure) led to select non-oxide ceramics for the cladding material. Among these ceramics ; Ti3SiC2 is distinguishable by its particularity to combine some properties of metals with those of ceramics. However ; its behaviour under irradiation is not known. The goal of this PhD is so to characterize the damages induced by irradiations in Ti3SiC2 by using ionic irradiations to simulate the effect of neutron irradiations. Some specimens were irradiated by different ion-energy couples (4 MeV Au ; 74 MeV Kr ; 92 MeV and 930 MeV Xe) at several fluences and temperatures. After irradiation ; the structural changes were characterised by low incidence X-ray diffraction and transmission electron microscopy whereas atomic force microscopy allowed the microstructural change study. Thus ; whatever the performed irradiations are ; Ti3SiC2 remains crystallized (up to 7 dpa of damages) and no latent track was noticeable (28 keV nm-1 of maximal electronic stopping power). Moreover ; as a function of irradiation parameters ; an expansion of the hexagonal close-packed unit cell of Ti3SiC2 is noticed along the c axis ; leading notably to microstrains. Eventually ; from the point of view of the microstructure ; the 92 MeV Xe ion irradiations induce the formation of hills on the surface whereas a slight swelling is noticed by the 4 MeV Au ion irradiations.
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Submitted on : Friday, January 8, 2010 - 3:21:04 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:31 PM
Long-term archiving on: : Thursday, June 17, 2010 - 8:22:39 PM

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  • HAL Id : tel-00445458, version 1

Citation

Jean-Christophe Nappé. Évaluation du comportement sous irradiation de Ti3SiC2 : Étude de l'endommagement structural et microstructural. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2009. Français. ⟨tel-00445458⟩

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