| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
O-33: Phase Transformations and Microstructural Evolution |
| Author(s) |
George R. Lindemann, Paul Chao, Ashwin Shahani |
| On-Site Speaker (Planned) |
George R. Lindemann |
| Abstract Scope |
Multi-phase materials often operate under elevated temperatures during which coarsening may cause microstructural changes. Therefore, it is paramount to understand how such materials evolve under these conditions to better predict their longevity in-service. We employ recent advances in 4D (three spatial dimensions with time) synchrotron-based X-ray nano-tomography to investigate the Al-Ag2Al-Al2Cu three-phase eutectic microstructure during isothermal annealing below the eutectic temperature. With the aid of a new, in situ furnace and an innovative total variation regularization reconstruction technique, we visualize the evolution of the eutectic lamellae and identify the coarsening mechanism for the Ag2Al intermetallic phase as 2D Ostwald ripening. An innovative method was also developed to track crystallographic changes of the interphase boundaries in time. Somewhat surprisingly, the data reveal that the microstructure is not self-similar, but instead shows preferential alignment of habit planes as annealing proceeds. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Other, |