About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
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Presentation Title |
The effect of hierarchical structure on the mechanical properties of nanoporous gold in electrochemical environment |
Author(s) |
Hansol Jeon |
On-Site Speaker (Planned) |
Hansol Jeon |
Abstract Scope |
Fabrication routes for hierarchical nanoporous gold (HNPG), multiple levels of an open-cell structure with nano-sized ligaments and pores in the material, have been recently developed. A comparison of the mechanical behavior of unimodal nanoporous gold (NPG) and HNPG usually has the drawback of different solid fractions for both materials. Here, we studied mechanical properties of NPG and HNPG with the same solid fraction by conducting compressive tests at micro-scale in electrochemical environment. We prepared NPG and HNPG pillars from the same master alloy Ag85Au15. We found that (1) the flow stress in HNPG is much higher than in NPG, (2) the OH- adsorbed surface layer is responsible for enhancement of flow stress, and (3) a ligament-size effect exists in the lower-level structure of HNPG in terms of flow stress and stress variation by OH- adsorption. Connectivity and dislocation activity as the origin for the difference in mechanical properties were discussed. |
Proceedings Inclusion? |
Planned: |