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MM: Fachverband Metall- und Materialphysik
MM 3: Mechanical Properties and Alloy Design I
MM 3.2: Vortrag
Montag, 9. März 2026, 10:30–10:45, SCH/A215
Role of Structural Hierarchy on Tensile Properties of Nanoporous Metals — •Wei-Che Chang1, Yong Li1, Henry Ovri1, and Shan Shi1,2 — 1Institute of Hydrogen Technology, Helmholtz-Zentrum Hereon, Geesthacht, Germany — 2Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany
Nanoporous gold (NPG) is drawing significant attention as functional, lightweight material due to its low density, high surface area, and tunable structures. Despite the inherent ductility of bulk gold, NPG often exhibits brittleness under tension [1]. Recently, hierarchical nanoporous gold (HNPG) with multiple levels of well-defined porosities has attracted significant interest for its enhanced functional performance and improved compressive properties at reduced solid fraction [2]. However, whether these mechanical enhancements under compression also extend to tension, particularly whether structural hierarchy can mitigate the intrinsic brittleness of nanoporous networks under tension, remains an important open question. In this work, we introduce an in-situ micro-tensile setup for real-time observation of deformation and fracture behaviors in a scanning electron microscope (SEM). Our results show that the hierarchical structure improves ductility by a factor of five. The mechanism of tensile deformation is further revealed by molecular dynamics simulations.
[1] N. Badwe, X. Chen, K. Sieradzki, Acta Mater. 129 (2017) 251-258 [2] S. Shi, Y. Li, B. Ngo-Dinh, J. Markmann, J. Weissmüller, Science 371 (2021) 1026-1033
Keywords: Tensile test; Nanoporous gold; Mechanical properties; Hierarchical; Microstructure