Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.33: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Hierarchical-structural effect on creep of nanoporous gold — •Hansol Jeon1, Shan Shi1,2, Jürgen Markmann1,2, and Erica Lilleodden3 — 1Helmholtz-Zentrum Hereon, Institute of Materials Mechanics, 21502 Geesthacht — 2Hamburg University of Technology, Institute of Materials Physics and Technology, 21073 Hamburg — 3Fraunhofer Institute for Microstructure of Materials and Systems, 06120 Halle (Saale)
Nanoporous gold (NPG), a bi-continuous structure composed of ligaments and pores, is highly attracting attention in application fields due to its high surface area and chemical inertness. In addition, hierarchical nested-network nanoporous gold (N3PG) has been developed as an even lighter and faster functional material. With respect to mechanical properties, the research on the time-dependent deformation as called creep for NPG and N3PG is scarce while there have many studies of tension, compression, and nanoindentation. In this study, we performed compressive creep tests for NPG and N3PG pillars in order to investigate the creep behavior under control of the electrochemical potential. We prepared N3PG samples with the same higher-level ligament size and with different lower-level ligament-sizes and a non-hierarchical NPG sample according to the higher-level ligament size so that we analyzed the effect of lower-level ligament-size on N3PG as well as the effect of the hierarchical structure itself on creep. In addition, by controlling the electrochemical potential, we controlled the surface status in order to check on the size effect of the relationship between creep behavior and surface state.