Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 40: Topical Session Bulk Nanostrucured Materials IX - Functional Properties II
MM 40.2: Vortrag
Mittwoch, 28. März 2012, 16:45–17:00, H 0106
About strain homogeneity at HPT in ufg and nc Pd — •Lilia Kurmanaeva1, Yulia Ivanisenko1, Aaron Weis1, Christian Kübel1, Delphine Chassaing1, and Hans-Jörg Fecht1,2 — 1Institute of Nanotechnology (INT), Karlsruhe Institute of Technology, Germany — 2Institute of Micro and Nanomaterials, University of Ulm, Ulm, Germany
It is known that ufg and nc are prone to the localization of deformation, which leads to the lack of ductility in tension. However, strain inhomogeneity also takes place during torsion straining. Since high pressure torsion is very important method to produce nanostructured samples, here we studied deformation homogeneity at HPT of ultrafine-grained and nanocrystalline Pd and Pd alloys in radial direction. Disk samples were cut at a middle of radius. On the electrolytically polished cut surface a fine grid was produced by FIB. Then samples were HPT strained. We observed an obvious strain localisation on the deformed grid in ufg samples. For a further investigation plane-view TEM samples were cut from the area of the grid. The obtained results of TEM microstructure of Pd and Pd alloys are discussed.