About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defect and Phase Transformation Pathway Engineering for Desired Microstructures
|
| Presentation Title |
High-temperature Bulk Dislocation Dynamics in Aluminum |
| Author(s) |
Leora E. Dresselhaus-Marais |
| On-Site Speaker (Planned) |
Leora E. Dresselhaus-Marais |
| Abstract Scope |
Establishing the appropriate thermal pathways to tune a metal’s microstructure and generate the appropriate continuum response requires a quantitative view of high-temperature annealing. The dislocation motion and interactions that are known to dictate microstructural changes in metals depend strongly on temperature, however, the necessary time-resolved measurements have been elusive, especially near the melt. We use time-resolved dark-field X-ray microscopy to directly image dislocation motion at temperatures spanning the final 7% to Tm. Our real-time movies resolve the creep-dominated dislocation motion and interactions deep beneath any surface in single-crystal, showing dynamics that has previously been limited to theory. Quantitative analysis of the temperature-dependent dislocation mobility in these findings present opportunities to test and refine dislocation models that have previously relied on indirect measurements and multi-scale models for validation. This work was performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |