Etude de l'évolution de texture lors de la recristallisation et de la croissance de grains d'alliages de titane et de zirconium

Abstract : The objective is to explain mechanisms leading to texture change during annealing for commercially pure Ti (T40) and a zirconium alloy (Zr702) by making relationships between phenomena occurred during deformation, recrystallization and grain growth. In this experimental study, X-Ray goniometry SEM-EBSD and TEM were used to give complete descriptions on microstructure and texture evolution from deformed state until grain growth stage. Texture evolution for both materials are similar during cold rolling and annealing. Texture changes mainly during grain growth. Recrystallization changes slightly the rolling texture (maxima at {Phi1=0? PHI Phi2=0?}. Different deformation behaviors of both materials during cold rolling give differences in recrystallization mechanisms. T40 and Zr702 showed a not oriented nucleation. The slight growth selection since recrystallization stage develops the texture component {Phi1=0? PHI Phi2=30?} which becomes main component at advanced stage of grain growth. T40 evolves by normal grain growth for annealing temperature at 600, 700 and 800?C. Grain growth kinetics parameters for T40 were determined. Zr702 showed lower grain growth kinetics due to precipitates which are also the responsible for abnormal grain growth when heat treatments were done for long time at 800?C.
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Natanael Dewobroto. Etude de l'évolution de texture lors de la recristallisation et de la croissance de grains d'alliages de titane et de zirconium. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ012S⟩. ⟨tel-01750131⟩

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