Détermination des textures de la phase [beta] à haute température de produits TA6V à partir des orientations individuellles de la phase alpha à basse température : applications à l'étude des changements de textures induits par changement de phase après traitements thermomécaniques

Abstract : The first part of this work describes an indirect method for the determination of the beta phase texture at high temperature. In a second part of this work, this method was used in order to study the changes in texture generated by the beta (b.c.c.)>alpha (h.c.) phase tranformation after variuous thermal or thermomecanical treatments. We have shown that the orientation of a given beta grain at high temperature can be determined by correlation of the orientations of the inherited alpha plates obtained from the transformation of this grain. These individual orientations were determined by the E.B.S.P. technique. This method was also used to charactérise the beta phase texture at high temperature. The texture was relatively pronounced and showed two major components after thermal treatment in the beta or in the alpha + beta fields. In the case of plastic deformation at high temperature, the texture exhibits a third orientation characterised by the following Euler's angles : (0°, 0°, 45°). From the high temperature beta texture, we have simulated the low temperature alpha texture, using a model without any variant selection. Comparing the simulated and the experimental textures of the alpha phase, we have shown that after thermal treatment in the beta domain, the beta > alpha transformation occurs without variant selection. On the contrary, a variant selection takes place in the case of the thermal treatment in the alpha+beta domain as well as in the case of the sample deformed in the beta field. In the last part of this work, we have tested several assumptions, to explain the physical mechanisms responsible for the variant selection after deformation in the beta domain. Thus, we have shown that the variant selection is associated with the {110}<111> and {112}<111> gliding systems which are the most active during the plastic deformation of the beta phase
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Hassan Moustahfid. Détermination des textures de la phase [beta] à haute température de produits TA6V à partir des orientations individuellles de la phase alpha à basse température : applications à l'étude des changements de textures induits par changement de phase après traitements thermomécaniques. Autre. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ010S⟩. ⟨tel-01777113⟩

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