Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 8: Interface Controlled Properties, Nanomaterials and Microstructure Design II
MM 8.3: Vortrag
Montag, 18. März 2024, 12:15–12:30, C 230
In-situ xray nanotomography of the isothermal structural-topological evolution of nanoporous gold — •Markus Ziehmer1,2, Kate L.M. Elder3,4, Jürgen Markmann2, Yijuan Wu2, Tiberiu Stan4, Jin Zhang4, Xianghui Xiao5, Erica T. Lilleodden6,2, and Peter W. Voorhees4 — 1Universität Ulm, Institut für Funktionelle Nanosysteme, — 2Helmholtz-Zentrum Hereon, Institut für Werkstoffmechanik — 3Lawrence Livermore National Laboratory — 4Northwestern University, Department of Materials Science and Engineering — 5Brookhaven National Laboratory, National Synchrotron Light Source II — 6Fraunhofer IMWS, Fraunhofer-Institut für Mikrostruktur von Werkstoffen und Systemen
The structural coarsening of nanoporous gold and other metallic, bicontinuous systems is inherently linked to topological transitions. These transitions do not only act on the global topological parameters, but also on local descriptors, as well as on the crystallographical evolution.
Various types of topological transitions have been identified experimentally recently: pinch-off, ring collapse, ligament reattachment, and particle detachment and reattachment. The relative weight of such transitions to happen, seems to depend strongly on the material's solid volume fraction, but also on the coarsening stage.
We report on in-situ xray nanotomography experiments, that allowed for tracking same sample subvolumes, in order to further elucidate aspects of the topological evolution in bicontinuous metallic materials.
Keywords: nanoporous metallic systems; nanoporous gold; topological evolution; xray nanotomography