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MM: Fachverband Metall- und Materialphysik
MM 61: Nanomaterials - I
MM 61.1: Vortrag
Donnerstag, 19. März 2020, 15:45–16:00, IFW D
Nanoporous Copper-Nickel -- Macroscopic bodies of a strong and deformable nanoporous base metal by dealloying — •Lukas Lührs1 and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology — 2Institute of Materials Research, Materials Mechanics, Helmholtz- Zentrum Geesthacht
Owing to their very large surface area to volume ratio, nanoporous metals made by dealloying in aqueous solutions promise significant functionalization. Potential applications arise as actuators, sensors, catalysts or structural materials with tunable mechanical properties. An obvious require-ment for a materials competitive ability in these fields is affordability. In addition, deformability is required to avoid premature failure upon exposure to stress concentrations or to designed mechanical load. So far, macroscopic samples of nanoporous metals with a high surface area and deformability have been limited to precious, and thereby costly, metals such as Au, Pd and Pt.
Here we present nanoporous Copper-Nickel (npCN), a nanoporous base metal that can be made in macroscopic dimensions (> several mm in size) and shows significant deformability. Fabricated through dealloying in aqueous media, npCN exhibits a uniform, bicontinous network structure with feature sizes that can be controlled from 13 to 40 nm through thermal annealing. Continuous com-pression tests find ductile deformation behavior accompanied with a high strength compared to other nanoporous base metals as well as macroporous Cu- and Ni-foams with similar solid fraction.