| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Distinguishing Competing Mechanisms in the Deformation of Ultra-Small Nanoparticles |
| Author(s) |
Tevis D.B. Jacobs, Ruikang Ding, Amit Prasad, Douglas Zhang, Ting Liu, Ashlie Martini |
| On-Site Speaker (Planned) |
Tevis D.B. Jacobs |
| Abstract Scope |
Surfaces have a strong effect on nanoparticle deformation, but the mechanisms change with particle size, shape and structure and with deformation conditions. Here, we have used in situ compression of Au, Ag, and Pt nanoparticles, coupled with atomistic simulations of the same materials, to investigate the deformation behavior of metal nanoparticles. First we investigated how particle structure modified the elastic deformation and the creation of networks of entangled dislocations that contributed to fully reversible deformation. Then we showed, in the permanent-deformation regime, how the surface weakens the nanoparticle in both the so-called “displacive” and “diffusive” regimes. Moving beyond the traditional Coble-creep-like model, we reveal how mechanical deformation of small particles is governed by a competition between surface nucleation of dislocations and surface-mediated shape change. Taken together, these investigations reveal the fundamental science that will guide the creation of stronger and more stable nanoparticle catalysts. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Characterization, Thin Films and Interfaces |