| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Seeing Buried Metal/Oxide Interfaces in Action |
| Author(s) |
Guangwen Zhou |
| On-Site Speaker (Planned) |
Guangwen Zhou |
| Abstract Scope |
Most engineering materials are based on multiphase microstructures that relax toward equilibrium by misfit dislocations across heterophase interfaces. Directly probing the spatiotemporal dynamics of misfit dislocations has been unachievable owing to their buried nature. Using the Cu2O to Cu transformation as an example, we demonstrate the unique role of misfit dislocations in modulating the oxide-to-metal interfacial transformations in an intermittent manner, by which the lateral flow of interfacial ledges is pinned at the core of misfit dislocations until the dislocation climbs to the new oxide/metal interface location, thereby resulting in the stop-and-go kinetics of the interfacial reaction. The work highlights the unique capabilities of in-situ transmission electron microscopy in providing mechanistic insight into solid-solid interfacial transformations, and the results have substantial implications in utilizing structural defects at buried interfaces to modulate mass transport and transformation kinetics. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Thin Films and Interfaces, Characterization |