Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.8: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Diffusion and microhardness in ultrafine grained nickel — •Simon Trubel, Sergiy Divinski, Gerrit Reglitz, Jörn Leuthold, and Gerhard Wilde — Westfälische Wilhelms-Universität, Institut für Matrialphysik, Wilhelm-Klemm-Straße 10, 48149 Münster

Ultrafine grained and nanocrystalline materials produced by methods of severe plastic deformation have roused a growing interest in science and technology. To determine how certain characteristics of internal interfaces in a material are affected by severe deformation, diffusion is a suitable method. The material under investigation is nickel in a purity of 99.6%. High pressure torsion (HPT) is applied where nickel discs are subjected to quasi-hydrostatic pressure of 2 GPa and torsionally deformed several times. Ultrafine grained Ni is produced and grain boundary self-diffusion is measured at several temperatures applying the radioactive isotope 63Ni. The HPT process refines the grain size in the material and the grain boundary diffusion is significantly enhanced. Nanoindentation is used to obtain information about mechanical properties of the material and their evolution with annealing temperature.