Dresden 2009 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Mechanical Properties III
MM 17.2: Talk
Tuesday, March 24, 2009, 10:30–10:45, IFW D
Deformation behavior of nanocrystalline Pd and Pd-10 at. % Au alloy investigated by mini-compression test — •Lilia Kurmanaeva1, Yulia Ivanisenko1, Jürgen Markmann2, and Hans-Jörg Fecht3 — 1Institute für Nanotechnology (INT), Forschungszentrum Karlsruhe, Karlsruhe, Germany — 2Universität des Saarlandes, FR7.3 Technische Physik, Saarbrücken, Germany — 3Institute of Micro and Nanomaterials, University of Ulm, Ulm, Germany
Investigations of mechanical properties of nanocrystalline (nc) materials are still in interest of materials science. The method of inert gas condensation (igc) allows to produce nc samples having uniform equiaxed microstructure with the mean grain size of 5-10 nm, and of very high purity. Here, we present results of the microstructure and mechanical properties investigation of nc as-igc Pd and Pd-10 at. % Au alloy. The specimens' microstructure was analysed by means of XRD and TEM, and mechanical properties were studied in compression tests using a dedicated testing stage for miniature specimens. Conventional compression tests showed that samples demonstrate high stress (the yield strength were 0.95 GPa and 1.12 GPa for as-igc Pd and Pd-10%Au, respectively) with significant ductility. Strain-rate jump compression tests revealed high strain rate sensitivity in nc Pd and Pd-Au alloy, strain rate sensitivity parameter (m) was 0.067 and 0.034, and activation volume was 4 and 7 burgers vectors for Pd and for Pd-10%Au, respectively. The obtained results of mechanical properties and microstructure are discussed.