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Relaxation path of metastable nanoclusters in oxide dispersion strengthened materials

Abstract : ODS steels are a promising class of structural materials for sodium cooled fast reactor application. The ultra-high density of the strengthening nanoclusters dispersed within the ferritic matrix is responsible of the excellent creep properties of the alloy. Fine characterization of the nanoclusters has been conducted on a Fe-14Cr-0.3Ti-0.3Y2O3 ODS material using High Resolution and Energy Filtered Transmission Electron Microscopy. The nanoclusters exhibit a cubic symmetry possibly identified as f.c.c and display a non-equilibrium YTiCrO chemical composition thought to be stabilized by a vacancy supersaturation. These nanoclusters undergo relaxation towards the Y2Ti2O7-like state as they grow. A Cr shell is observed around the relaxed nano-oxides, this size-dependent shell may form after the release of Cr by the particles. The relaxation energy barrier appears to be higher for the smaller particles probably owing to a volume/surface ratio effect in reason to the full coherency of the nanoclusters
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J. Ribis, M.A. Thual, T. Guilbert, Y. de Carlan, A. Legris. Relaxation path of metastable nanoclusters in oxide dispersion strengthened materials. Journal of Nuclear Materials, Elsevier, 2017, 484, pp.183-192. ⟨10.1016/j.jnucmat.2016.12.007⟩. ⟨cea-02381277⟩



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