Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 55: Mechanical Properties III

MM 55.2: Talk

Thursday, March 19, 2015, 12:00–12:15, TC 010

Formation of Oblique Cube Component in Intermetallic Compounds Deformed by High Pressure Torsion — •Christine Tränkner¹, Aurimas Pukenas¹, Jelena Horky², Michael Zehetbauer², and Werner Skrotzki¹ — ¹Institute of Structural Physics, Dresden University of Technology, Dresden, Germany — ²Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, Vienna, Austria

NiAl, YCu and TiAl polycrystals with B2 and L1₀ structure, respectively, have been deformed by high pressure torsion at temperatures between 20^∘C and 500^∘C at a hydrostatic pressure of 8 GPa to high shear strains. Local texture measurements were done by diffraction of high-energy synchrotron radiation and X-ray microdiffraction. In addition, the microstructure was analyzed by electron backscatter diffraction. Besides typical shear components an oblique cube component is observed with quite large rotations about the transverse direction. Based on the temperature dependence of this component as well as to microstructure investigations it is concluded that it is formed by discontinuous dynamic recrystallization. The influence of high pressure on recrystallization of intermetallics at low temperatures is discussed.