| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
In-situ Imaging of Transonic Dislocations & Plasticity |
| Author(s) |
Leora E. Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Leora E. Dresselhaus-Marais |
| Abstract Scope |
Dislocations form hierarchical networks that set the properties and dynamics of metals, but our understanding of these dynamics at extreme conditions is limited. My group develops X-ray microscopes to image dislocations under non-classical conditions. Using the ultrafast and ultrabright pulses available at X-ray free electron lasers (XFELs), we revealed a new view dislocations and crystal plasticity during shock waves. Using in-situ radiography we directly image the first experimental view of dislocations moving faster than the speed of sound (transonic dislocations) – providing the first validation of phonon radiation under these unusual conditions. I will then show our in-situ X-ray topography during shock waves that image the crystal plasticity evolving from those transonic dislocations – giving rise to the exotic ductile behavior in diamond crystals that could be brittle under static conditions. Our new microscopes offer key opportunities to establish the fundamental science underlying our understanding and control of defects. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Other |