Berlin 2024 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 8: Interface Controlled Properties, Nanomaterials and Microstructure Design II

MM 8.1: Vortrag

Montag, 18. März 2024, 11:45–12:00, C 230

Topology-dependent scaling behavior of stiffness and strength of hierarchical nanoporous metals — •Lukas Riedel¹, Jürgen Markmann^1,2, and Shan Shi^3,1 — ¹Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht, Germany — ²Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — ³Research Group of Integrated Metallic Nanomaterials Systems, Hamburg University of Technology, Hamburg, Germany

Structural hierarchy in nanoporous metals allows optimized functional and mechanical properties in lightweight materials. In this work, hierarchical nanoporous gold with two distinct length scales is synthesized via a dealloying-coarsening-dealloying method. This method enables tuning the structure of the lower and upper hierarchy level independently. The structural parameters including ligament diameter, ligament distance, solid fraction, and topological connectivity are characterized by combining focused ion beam tomography with small- and ultra-small-angle X-ray scattering. The mechanical studies indicate that consistent with the connectivity, the effective macroscopic Young's modulus and the normalized strength also highly depend on the ligament size of both the upper and the lower hierarchy level. These experimental findings serve as basis for the development of a topology-dependent scaling law for the stiffness and strength of random hierarchically nested-network nanomaterials.

Keywords: nanoporous metals; hierarchy; ligament size; X-ray scattering