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MM: Fachverband Metall- und Materialphysik

MM 8: Interface Controlled Properties, Nanomaterials and Microstructure Design II

MM 8.3: Talk

Monday, March 18, 2024, 12:15–12:30, C 230

In-situ xray nanotomography of the isothermal structural-topological evolution of nanoporous gold — •Markus Ziehmer^1,2, Kate L.M. Elder^3,4, Jürgen Markmann², Yijuan Wu², Tiberiu Stan⁴, Jin Zhang⁴, Xianghui Xiao⁵, Erica T. Lilleodden^6,2, 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