| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Motion of a Dislocation Boundary in Thermal Annealing Resolved with Dark-field X-ray Microscopy |
| Author(s) |
Leora E. Dresselhaus-Marais, Can Yildirim, Henning Friis Poulsen, Carsten Detlefs, Grethe Winther |
| On-Site Speaker (Planned) |
Leora E. Dresselhaus-Marais |
| Abstract Scope |
Dislocation boundaries dominate the multiscale structure and properties of metals, setting the complex dynamics that determine how they respond to external stresses or heating. Recovery during thermal annealing leads to dislocation annihilation, self-organization into and coarsening of dislocation structures through mechanisms that are poorly understood at the single-dislocation level – especially deep inside bulk materials. I present a new view of how dislocation boundaries migrate, evolve and destabilize over the course of thermal annealing, using the novel time-resolved dark-field X-ray microscopy (DFXM). With movies of long-range dislocation motion and interactions that span hundreds of micrometers, we reveal the dynamics that cause these 3D structures to migrate and dissolve at temperatures >0.9 Tm, illustrating how stochastic thermal motion drives the high-T recovery. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Characterization, Extraction and Processing |