| 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 |
A Combined Experimental-Computational Study of the Compression of Nanoporous Gold Nanoparticles |
| Author(s) |
Ben Engelman, Santhosh Mathesan, Tatyana Fedyaev, Eugen Rabkin, Dan Mordehai |
| On-Site Speaker (Planned) |
Dan Mordehai |
| Abstract Scope |
In this talk, we introduce a novel method to study the mechanical properties of nanoporous gold (NPG) structures. By combining the dewetting method and dealloying of gold-silver alloys, we fabricated sub-micrometer scale hemispherical NPG nanoparticles. Under compression, the load-displacement curves increased linearly followed by a significant slope rise. Molecular dynamics (MD) simulations of NPG nanoparticles with various sizes, porosities, and ligament diameters were conducted to understand their deformation better. The simulated load-displacement curves closely matched the experimental ones. Densification was found to be inhomogeneous and localized beneath the punch, correlating with the mean-free path of dislocations and their depletion due to the high surface-to-volume ratio. The slope increase in the load-displacement curves is attributed to the interaction between the densification region and the substrate. Finally, we propose a model for the inhomogeneous deformation, enabling the evaluation of contact stresses in experiments and discussing its application to nanoindentation of NPG structures. |
| Proceedings Inclusion? |
Planned: |