Regensburg 2025 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 28: Mechanical properties

MM 28.5: Vortrag

Donnerstag, 20. März 2025, 11:15–11:30, H23

Effect of Cold Work on the Microstructure and Properties of Hierarchical Nanoporous Metals — •Weiche Chang¹ and Shan Shi^2,1 — ¹Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, Geesthacht, Germany — ²Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany,

Nanoporous metals with bicontinuous porous network, high specific surface area, and low density have shown promising applications as light-weight structural materials and high-performance functional materials in actuators, sensors, and various energy devices. Recently, monolithic hierarchical nanoporous gold (HNPG) has been tailor-made via a two-step dealloying method and has shown improved mechanical properties and much lower density than non-hierarchical nanoporous gold. The effects of ligament size and structural hierarchy on the strength of HNPG have also been well studied via macro- or micro-compression approaches. In this work, we further explore the role of cold working treatments before and after second step dealloying on the mechanical properties of HNPG using micropillar compression tests. Furthermore, HNPG with a controllable degree of anisotropy and a much wider range of solid fractions are obtained.

Keywords: Dealloying; Cold work; Nanoporous Gold; Hierarchical; Micropillar Compression