SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Mechanical Properties and Alloy Design: Porous and Nanostructured Materials

MM 22.3: Vortrag

Dienstag, 28. März 2023, 14:45–15:00, SCH A 118

Hierarchical-structural effects on mechanical behavior of nanoporous gold in electrochemical environment — •Hansol Jeon¹, Shan Shi^{3, 1}, and Jürgen Markmann^{1, 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

Recently, hierarchical nanoporous gold (HNPG) has been emerged with having multiple-level structures. HNPG is more active because of higher surface area than nanoporous gold (NPG) since Au ligaments are supposed to be converted into another porous structure with smaller ligaments and pores. Regarding mechanical behavior, especially with the same solid fraction for both, it has been not directly compared yet whether HNPG would have better me-chanical properties. Here, we investigated the mechanical properties of NPG and HNPG with the same solid fraction by conducting compressive tests at the micro-scale. The NPG and HNPG were prepared from the same precursor alloy Ag85Au15 by dealloying. The pillars were milled by a focused ion beam (FIB), and compressive tests were performed by a nanoindenter with a flat-punch tip. We discussed the difference of dislocation activities and connectivity for NPG and HNPG. Finally, by conducting additional compressive tests in an electrochemical environment, we explored the role of surface state on the mechanical behavior of NPG and HNPG by impos-ing electrode potential.