Hétérogénéité de déformation plastique induites et conséquences sur la formation des microbandes de cisaillement et des textures

Abstract : We propose a study of the mechanisms of heterogeneous plastic deformation in polycrystals and the consequences of the induced heterogeneities on the formation of textures on the internal stresses and on the microshear bands. Using the Kröner's theory about the incompatibility problems and about internal stresses, we derive some characteristics of the heterogeneities often observed in single and polycrystals. Taking into account the "physical thichness" of the heterogeneity volumes, we have derived two terms for the incompatibility tensors : a "long distance" term associated to the dipolar structure of the dislocations. The latter explains the formation and the development of the microshear bands. On the other hand, we have introduced in the hig latent hardening metals the concept of heterogeneous plastic deformation. For this, we have distinguished the homogenous multiple slip and the single slip without any other deformation mechanism. The general idea is inspired from the scheme which is generally used for the phase transformations and from the self-consistent scheme. Analysing the compatibility of this deformation field, we could confirm the existence of relations between the formation of such intragranular heterogeneities and : on one hand, the formation of some texture components characterizing these metals ; on one hand, the formation and the orientation of the microshear bands
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Hassan Bouaouine. Hétérogénéité de déformation plastique induites et conséquences sur la formation des microbandes de cisaillement et des textures. Autre. Université Paul Verlaine - Metz, 1988. Français. ⟨NNT : 1988METZ003S⟩. ⟨tel-01775746⟩

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