Dresden 2017 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster session II
MM 34.25: Poster
Dienstag, 21. März 2017, 18:30–20:30, P4
Effects of surface diffusion and surface roughness on plastic behavior of nanoporous gold — •Jie Li1, Nadiia Mameka1, and Jörg Weissmüller1,2 — 1Helmholtz-Zentrum Geesthacht, Institut für Werkstoffforschung, Werkstoffmechanik, Geesthacht, Germany — 2Technische Universität Hamburg-Harburg, Institut für Werkstoffphysik und -technologie, Hamburg, Germany
The microstructure of dealloying-derived nanoporous metals may be understood as a network of interconnected single nanowires (or nanoligaments). The availability of millimeter-size samples of these nanomaterials predestine them for fundamental studies of small-scale effects on the mechanical behavior. While recent experiments and simulations have acknowledged important effects of ligament size along with solid fraction and network connectivity on both elastic and plastic deformation, the role of surface effects and their precise origin remain to be clarified. Among relevant microscopic processes at the surface are impact of the surface diffusion and atomic-scale surface roughness on the plastic behavior of the high surface area materials are explored in this study. We probe the plastic response of nanoporous gold to changes of the surface diffusion constant and surface roughness or smoothness of the nanoligaments by deforming the material in situ in an electrochemical cell with various surface conditions. The relationships between different surface morphologies induced in our experiments by the exposure to the specific electrochemical environments and the plastic behavior are discussed.