Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 29: Poster II
MM 29.15: Poster
Tuesday, March 19, 2024, 17:00–19:00, Poster B
Effects of relative-density ratio between upper- and lower- level structure in hierarchical nanoporous gold on mechanical behavior — •Hansol Jeon1, Shan Shi3,1, and Jürgen Markmann1,2 — 1Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, 21073 Hamburg, Germany — 3Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technol-ogy, 21073 Hamburg, Germany
Hierarchical nanoporous gold (HNPG), multiple-level structures, has receiving a lot of at-tention in application fields as one of new materials owing to higher surface area and faster reac-tivity compared to unimodal nanoporous gold (HNPG). Regarding its mechanical behavior, it has not been much research on this yet since it is quite advanced materials, and it would be expected to be more complex due to the multi-level's ligament sizes and relative densities. Here, we have investigated the effect of relative-density ratio between upper- and lower- levels on the mechanical properties of HNPG having the same total solid fraction by performing pillar compressive tests. HNPG samples having different ratio of relative density between upper- and lower- levels from the same precursor alloy Ag85Au15 by dealloying. The pillars were prepared by a focused ion beam (FIB), and compressive tests were conducted by a nanoindenter with a flat-punch tip. We have linked their mechanical properties with connectivity calculated from 3D reconstruction.
Keywords: hierarchical nanoporous gold; cellular materials; compressive test; mechanical behavior