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Aspects microstructuraux de l'oxydation d'alliages de Zirconium

Abstract : This thesis is focused on the microstructural characterisation of precipitates in the oxide of binary zirconium alloys (1 wt.% Fe, Cr or Ni or 0.6 wt.% Nb) under different oxidation conditions at 415°C. The samples were oxidised in autoclave in air and steam and in an environmental scanning electron microscope in water vapour. The microstructural evolution of the precipitates during oxidation was characterised using electron microscopy. The findings from the analysis are the following: -Two types of oxidation behaviour are observed for precipitates. -Pilling-Bedworth ratio of precipitates is higher than that of the zirconium matrix. -Formation of pure iron oxide crystals on the surface for iron bearing precipitates close to or at the surface. From these observations it is concluded that the precipitate oxidation behaviour can be correlated to precipitate composition and oxidation tendency of the elements in the precipitates. Iron exhibits clearly different behaviour.
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Submitted on : Monday, July 18, 2011 - 4:08:38 PM
Last modification on : Friday, March 25, 2022 - 9:40:28 AM
Long-term archiving on: : Wednesday, October 19, 2011 - 2:26:34 AM


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  • HAL Id : tel-00609232, version 1



Christian Proff. Aspects microstructuraux de l'oxydation d'alliages de Zirconium. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENI027⟩. ⟨tel-00609232⟩



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