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MM: Fachverband Metall- und Materialphysik
MM 43: Mechanical properties II
MM 43.1: Talk
Friday, March 30, 2007, 11:00–11:15, H6
high strength nanoporous platinum prepared by dealloying — •haijun jin1, dominik kramer1, julia ivanisenko1, and jörg weissmüller1,2 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Karlsruhe, Germany — 2Technische Physik, Universität des Saarlandes, Saarbrücken, Germany
Nanoporous metals prepared by dealloying, which have been proposed for technological applications due to its novel properties, are typically brittle even when the metal skeleton consists only of a ductile element like gold. Here, we report on the fabrication of a material which combines nanoporosity and large surface area with improved mechanical properties. A dual-phase Pt-Ag alloy, of which one phase is the silver-rich matrix and another the platinum-rich dendrites, was subjected to dealloying. The silver-rich matrix was dealloyed to form a nanoporous Pt structure. And the platinum-rich dendrites were stable and remained undissolved after dealloying, which are expected to act stabilizing against shear localization and critical crack propagation in nanoporous metals. Compared with Pt samples with uniform nanoporous structure, this composite-like material exhibits a high strength over 200 MPa and large plastic deformation prior to failure under compression.