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Article Dans Une Revue Acta Materialia Année : 2018

The influence of the cube component on the mechanical behaviour of copper polycrystalline samples in tension

Résumé

Copper tensile samples were prepared by various thermomechanical treatments (rolling and annealing) producing different initial textures, characterized mainly by an increasing Cube component. These samples were characterized microstructurally (orientation, grain boundary and grain size distributions) and mechanically (tensile stress-strain curves, hardness, dislocation density). It is found that an increase of the Cube percentage leads to an increase of the initial yield stress and to a decrease of the hardening rate at high strains. The macroscopic mechanical behaviour is compared with simulations performed with a simple Taylor type model including anisotropic plastic behaviour and dislocation-based constitutive equations. We show that the proposed modeling allows to reproduce all experimental curves with a limited number of adjusted parameters and that dynamic softening is more active in the Cube orientation than in any other present orientation. This is also confirmed by the EBSD and X-Ray data. As a result, the Cube orientation is shown to be softer in terms of texture and hardening rate. The opposite strengthening effect observed on the initial yield stress is shown to be due to heterogeneous grain size distributions resulting from complex recrystallization mechanisms.
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Dates et versions

hal-02340566 , version 1 (30-10-2019)

Identifiants

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B. Bacroix, S. Queyreau, D. Chaubet, E. Siv, Th Chauveau. The influence of the cube component on the mechanical behaviour of copper polycrystalline samples in tension. Acta Materialia, 2018, 160, pp.121-136. ⟨10.1016/j.actamat.2018.08.044⟩. ⟨hal-02340566⟩
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