Regensburg 2025 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 36: Mechanical Properties
MM 36.6: Talk
Friday, March 21, 2025, 11:45–12:00, H23
Scalable fabrication and mechanical behavior of hierarchical nanoscale network nickel — •Ulrike Dette1,2, Lukas Lührs2, and Shan Shi1,3 — 1Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, 21073 Hamburg, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, 21073 Hamburg, Germany — 3Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
The recent fabrication of mechanically robust two-level hierarchical nanoporous gold by two-step electrochemical dealloying has enabled the demonstration of enhanced mechanical properties and reduced density attributed to the structural hierarchy in the nanoscale network materials. This work aims to develop a new method for the scalable fabrication of low-cost hierarchical nanoscale network metals. Here, two- and three-level hierarchical network (HN) Ni samples are successfully prepared from Ni foams by a novel and simple alloying-dealloying method. Bulk three-level HN Ni samples are characterized by three well-defined strut/ligament sizes (160 μm, <10 μm and <10 nm) and a low density down to 0.06. In addition, we systematically perform mechanical studies on both two- and three-level HN Ni via macroscopic compression tests. We propose general scaling equations between mechanical properties and relative density for HN materials.
Keywords: hierarchical; nanoporous; mechanics; dealloying