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MM: Fachverband Metall- und Materialphysik
MM 18: Mechanical Properties I
MM 18.2: Talk
Tuesday, March 15, 2011, 14:15–14:30, IFW B
Inhomogeneity of texture and microstructure in copper deformed by ECAP — •Christine Tränkner, Robert Chulist, Benoit Beausir, and Werner Skrotzki — Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden, Germany
Polycrystalline copper of high purity was deformed by equal channel angular pressing (ECAP) at room temperature using routes A, BC and C with up to 4 passes. Local textures were measured by high-energy synchrotron radiation. For route BC this was done along 3 lines in the cross section from the top to the bottom of the billets; for routes A and C along 1 line in the middle of the cross section. Using orientation imaging by electron backscatter diffraction microstructure analysis was performed in the cross and in the longitudinal section.
Texture gradients in normal direction of the billets were found for all routes, while in addition a texture gradient in transverse direction was found for route BC. The texture is compared with that of simple shear. Different microstructures for route A, BC and C were detected in the cross and in the longitudinal section. They are presented for 4 passes and discussed with regard to the change of shear plane position when rotating the sample between two passes. The average grain size after 4 passes is approximately 1 µm for all routes. Grain refinement is explained by continuous dynamic recrystallization.