Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 3: Mechanical Properties and Alloy Design I
MM 3.4: Vortrag
Montag, 9. März 2026, 11:00–11:15, SCH/A215
Synthesis and mechanical properties of multi-scale hierarchical Ni and Cu foams — •Ulrike Dette1,2 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
As functionalized materials gain importance and component miniaturisation advances, there is an increasing demand for optimized structured materials. This talk presents a novel and straightforward alloying-dealloying approach to fabricate metals such as Ni and Cu with two- and three-level hierarchical network structures. Due to the significant difference in vapour pressures between the target metals, vapor phase alloying (VPA) of a metal foam with Zn resulted in Zn-based intermetallic alloy foams. This is then followed by vapor phase dealloying (VPD) which removes Zn and creates a finer porosity, resulting in a second level. A subsequent VPA-VPD cycle produces a third hierarchical level. Compression tests on these hierarchical foams with varying solid fractions were performed to determine Young's modulus and strength. The experimental results align well with the predictions of our new scaling law.
Keywords: hierarchical; nanoporous; mechanics; dealloying; vapour pressure