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MM: Fachverband Metall- und Materialphysik

MM 20: Topical Session Bulk Nanostrucured Materials IV - Microstructure and Characterization II

MM 20.4: Talk

Tuesday, March 27, 2012, 11:15–11:30, H 0107

Texture evolution in NiAl deformed by high pressure torsion — •Christine Tränkner¹, Robert Chulist¹, Werner Skrotzki¹, Benoit Beausir², Thomas Lippmann³, Jelena Horky⁴, and Michael Zehetbauer⁴ — ¹Institut für Strukturphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université Paul-Verlaine de Metz, Metz-57012, France — ³Institut für Werkstoffforschung, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany — ⁴Fakultät für Physik, Universität Wien, Austria

Small discs of polycrystalline NiAl were deformed by high pressure torsion at temperatures from room temperature up to 500°C and pressures ranging from 2 to 8 GPa. In this way, very high local shear strains at the edge of the samples of about 70 could be achieved. Local textures were measured by high-energy synchrotron radiation at several positions from the centre to the edge of the samples. Due to increasing shear strain along this line a texture gradient is observed. The texture also changes with processing temperature and pressure. Type and intensity of texture will be discussed with respect to slip system activity and recrystallization.