SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Interface Controlled Properties and Nanomaterials: Nanoporous Materials and Nanolaminates
MM 42.1: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, SCH A 215
Nanoporous high entropy alloys – functional nanoscale networks — •Lukas Lührs1, Friederike Ihle1, and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology — 2Institute of Materials Mechanics, Hybrid Materials Systems, Helmholtz-Zentrum hereon
Both, high entropy alloys as well as nanoporous metals have been the subject of considerable interest in recent years. The former topic explores alloys that are composed of multiple mayor alloying elements yielding countless opportunities for tailor-made material properties, such as outstanding mechanical performance. The latter investigates self-assembled network structures entirely composed of nanoscale elements. Owing to their large surface area to volume ratio, interfaces of nanoporous metals can be manipulated to obtain functional materials that can be used, e.g. as actuators, sensor or structural material with tunable mechanical properties.
In this work we combine both research topics to make monolithic bodies of a nanoporous high entropy alloy (np-HEA) by dealloying, a selective corrosion method, in aqueous media. Structural investigation finds a uniform, bicontinous network with feature sizes in the range of a few tens of nanometer. Moreover, samples of np-HEA exhibit a single phase microstructure with homogenous elemental distribution. Compression tests on macroscopic samples reveal considerable mechanical strength. In electrolyte, functionality is introduced by electrochemical modulation of the electrode potential which enables the generation of significant actuation strains.