Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 12: Nanostructured Materials IV
MM 12.2: Vortrag
Montag, 25. Februar 2008, 17:00–17:15, H 0107
Influence of grain boundaries on the elastic moduli of nanocrystalline palladium — •Manuel Grewer1, Jürgen Markmann1, Rainer Birringer1, and Walter Arnold2 — 1Universität des Saarlandes, FR 7.3 Technische Physik, Campus D2.2, 66123 Saarbrücken — 2Fraunhofer-Institut für zerstörungsfreie Prüfverfahren, Campus E3.1, 66123 Saarbrücken
Grain boundary stress of nanocrystalline Pd has been determined to be on the order of 1 J/m. There is however only scarce knowledge about the interface elastic moduli of nc materials. We take advantage of the recently discovered room temperature (RT) grain growth of nc-Pd and report about in-situ measurements of the transverse and longitudinal velocities of sound and grain size during RT-growth. We deduce the scaling behavior of the overall elastic moduli and discuss a method that enables to extract interface elastic moduli.