Mécanismes d'évolution de texture au cours du recuit d'alliages de zirconium et de titane

Abstract : Zirconium and Titanium are hexagonal metals. Thus, they have a weaker symmetry than cubic metals, and a stronger crystalline anisotropy. Despite this strong anisotropy, the fundamental mechanisms of the texture evolution of these metals has not been deeply investigated yet. We studied here the texture and microstructure evolution during annealing after several conditions of deformation, and showed that : slow texture change is expected in grain growth after severe rolling, because of oriented growth rapid texture change after low reductions is due to oriented nucleation transverse rolling gives rise to a correlation between orientation and stored energy in the deformed material, which also induces fast texture changes. These mechanisms have been explained on the basis of microstructure specificities. In addition, texture evolution during normal and abnormal grain growth have been studied in details, and moddeling was used to confirm some hypotheses on boundary mobility anisotropy
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François Gerspach. Mécanismes d'évolution de texture au cours du recuit d'alliages de zirconium et de titane. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ032S⟩. ⟨tel-01749004⟩

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