About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Behavior at the Nanoscale VII
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Presentation Title |
Investigating the Mechanisms and Driving Forces Governing the Mechanical Behavior of Sub–10–nm Metal Nanoparticles |
Author(s) |
Ruikang Ding, Soodabeh Azadehranjbar, Ingrid M. Padilla-Espinosa, Douglas Zhang, Muztoba Rabbani, Ashlie Martini, Tevis D. B. Jacobs |
On-Site Speaker (Planned) |
Ruikang Ding |
Abstract Scope |
Ultrasmall metal nanoparticles have important applications in catalysis due to their high surface activity; however, their small size also causes mechanical instability. Prior work explained “smaller-is-weaker” behavior by surface diffusion and a Coble-creep–like model. Here we used in situ transmission electron microscopy to characterize the mechanical response of more than 50 ultrasmall metal nanoparticles under external loading. First, we showed that the “smaller-is-weaker” behavior occurs even when the particle fails by dislocation plasticity. This is in contrast with prior findings, but consistent with the physics of surface dislocation nucleation. Second, our results indicate that ultrasmall nanoparticles can sustain a constant stress, in contrast to predictions of the Coble-creep model. Instead, we show new mechanisms and driving forces governing the atomic motion along the surface. These finding challenges the traditional view that diffusive deformation is kinetics–controlled and provides more insight into mechanical behavior of ultrasmall metal nanoparticles. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Characterization |