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Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Nanomaterials

MM 17.3: Talk

Tuesday, April 2, 2019, 10:45–11:00, H46

Nanoporous Copper-Nickel - Macroscopic bodies of a strong and deformable nanoporous base metal by dealloying — •Lukas Lührs1 and Jörg Weissmüller1,21Institute of Materials Physics and Technology, Hamburg University of Technology — 2Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht

In the field of nanostructured materials, nanoporous metals offer significant functionalization potential due to their high surface area to volume ratio. Profiting from high structural definition, potential applications arise as actuators, sensors and structural materials with tunable mechanical properties. Following material characteristics have to be met in these fields: Affordability is an obvious requirement as well as resistance against corrosion, most importantly when potential cycles in electrolyte provide the functionalization. Lastly, deformability is required for avoiding premature failure upon exposure to stress concentrations. 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. 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 by thermal annealing. Compression tests find ductile deformation behavior accompanied with a high strength compared to other nanoporous base metals as well as macroporous Cu- and Ni-foams.

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