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MM: Fachverband Metall- und Materialphysik
MM 55: Mechanical Properties III
MM 55.1: Vortrag
Donnerstag, 19. März 2015, 11:45–12:00, TC 010
Microstructure and Texture in a Cu-Cr Alloy deformed by High Pressure Torsion — •Ksenia Kosyakova1,2,3, Christine Tränkner3, Aurimas Pukenas3, Paul Chekhonin3, Daria Shangina1,2, Petr Straumal1,2, Boris Straumal2,4, Sergey Dobatkin1,2, and Werner Skrotzki3 — 1A.A. Baikov Institute of Metallurgy and Materials Science of RAS, Moscow, Russia — 2National University of Science and Technology "MISIS", Laboratory of Hybrid Nanostructured Materials, Moscow, Russia — 3Institute of Structural Physics, Dresden University of Technology, Dresden, Germany — 4Institute of Solid State Physics of RAS, Chernogolovka, Russia
The evolution of microstructure and texture in a Cu-0.7%Cr alloy deformed by high-pressure torsion (HPT) was examined depending on shear strain. Disks (diameter 10mm, thickness 0.6mm) were annealed at 600°C for 800h and HPT processed at room temperature under a hydrostatic pressure of 5 GPa for 0.5, 1, 3, 5 and 15 turns (max. shear strains 26, 52, 157, 262, 785). Electron backscatter and X-ray diffraction were applied at half-radius position for microstructure and texture analysis. After 5 rotations, a homogeneous ultrafine-grained structure is found with mean grain size of 190nm and predominance of high-angle boundaries. The texture consists of components typical for fcc-metals processed by simple shear deformation. Moreover, a new {1-14}<110> component is observed which is the main component for all shear strains. After 5 turns, the intensities of all components stay approximately the same.