Regensburg 2025 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Interface Controlled Properties, Nanomaterials and Microstructure Design
MM 21.2: Vortrag
Mittwoch, 19. März 2025, 16:00–16:15, H22
Compressive behavior and connecting topology of monolithic nanoporous niobium — •Seoyun Sohn1,2, Shan Shi3,1, Jürgen Markmann1,2, Stefan Alexander Berger1, and Jörg Weissmüller2,1 — 1Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, 21073 Hamburg, Germany — 3Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, 21073 Hamburg, Germany
This study investigates the mechanical behavior of nanoporous (NP) Nb fabricated through liquid-metal dealloying, with an eye on the role of structure size and topology. Results from X-ray nanotomography and macro-compression tests confirm that coarsening degrades yield strength and that Young's modulus deviates from scaling laws previously developed for NP Au made by dealloying in aqueous media. Our analysis reveals that the scaled genus, a measure of network connectivity, of NP Nb observed from the tomographic reconstructions is lower than what has been reported for NP Au. This reduced connectivity provides an obvious explanation for the low modulus of NP Nb. Furthermore, the structural dispersion implies that additional structural descriptors should be acknowledged to account for the mechanical differences between liquid-metal dealloyed materials and those synthesized via conventional aqueous dealloying.
Keywords: dealloying; nanoporous; niobium; mechanical behavior; tomography