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Morphologie et déformation à chaud de microstructures lamellaires dans les alliages de zirconium et de titane

Abstract : This study aims at providing a precise description of the lamellar microstructures of two alloys, Zircaloy-4 and TA6V, and at characterizing their deformation at high temperature. New experimental techniques have been developped for these materials: instrumented Jominy end quench test, channel-die with mobile walls, X-ray microtomography. The main results underline the role of the alpha_GB phase formed at the prior beta grain boundaries on the variant selection in Zircaloy-4 and TA6-V. The three dimensional organization of the colonies in TA6V is also revealed for the first time and discussed in relationship with the formation of the microstructure. In hot compressed Zircaloy-4 several mechanisms of strain localization are observed. Twinning activity at 750 °C, in particular, is clearly put into evidence. A classification of these heterogeneities is proposed and their influence on the recrystallization is discussed.
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https://tel.archives-ouvertes.fr/tel-00356622
Contributor : Nicolas Vanderesse <>
Submitted on : Wednesday, January 28, 2009 - 9:03:41 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:36 PM
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  • HAL Id : tel-00356622, version 1

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Nicolas Vanderesse. Morphologie et déformation à chaud de microstructures lamellaires dans les alliages de zirconium et de titane. Matériaux. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2008. Français. ⟨tel-00356622⟩

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