Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.32: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Structural-mechanical property correlation in hierarchical nanoporous gold — •Lukas Riedel1, Shan Shi1,2, Jürgen Markmann1, and Jörg Weißmüller1,2 — 1Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht, Germany — 2Institute of Material Physics and Technology, Hamburg University of Technology, Hamburg, Germany
Implementing a structural hierarchy in nanoporous metals has been demonstrated as an efficient way to achieve lightweight and enhanced mechanical performance. So far, several aspects of the correlation between structure and mechanical behavior are not clearly proven. Here, hierarchical nanoporous gold (HNPG) with tunable ligament size at each hierarchy level is synthesized out of Ag90Au10 via a dealloying-coarsening-dealloying strategy. The structural analysis is conducted with scanning electron microscopy, small-angle X-ray scattering (SAXS) and ultra small-angle X-ray scattering (USAXS). We demonstrate that SAXS and USAXS are valued as advantageous methods for the determination of the structural size of HNPG. In particular, USAXS is very useful for the description of nanoporous structures with a ligament size of several hundred nanometers. It is observed that the mechanical behavior of HNPG is highly dependent on the ligament size at both the upper and the lower hierarchy level. Moreover, HNPG made out of Ag90Au10 shows improved stiffness in comparison to HNPG made out of Ag93Au7 even though they have similar feature sizes. The results represent an evidence for the development of the connectivity during coarsening in relation to the solid fraction.