| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Dynamics of Abnormal Grain Growth in a Particle-containing System Uncovered by Multimodal Three-dimensional X-ray Imaging |
| Author(s) |
Jiwoong Kang, Ning Lu, Nancy Senabulya, Nicolas Gueninchault , Ashwin J Shahani |
| On-Site Speaker (Planned) |
Jiwoong Kang |
| Abstract Scope |
Abnormal grain growth (AGG) is a discontinuous process in which a few solid grains grow more rapidly than other grains, significantly influencing the properties of a granular microstructure. To better understand the mechanism of AGG in particle-containing alloys, we integrate laboratory-based X-ray absorption- and diffraction-contrast tomography (ACT and DCT, respectively) and image the evolution of microstructure in Al-3.5wt%Cu. The 4D data enables us to uncover what microstructural features set the abnormal grain apart from its neighbors. We find the distribution of grain boundaries (imaged via DCT) becomes more closely correlated to the distribution of Al2Cu particles (imaged via ACT) upon annealing, suggesting that the abnormal grain nucleates in a relatively particle-free region. Once it has attained its size advantage, the abnormal grain persists to grow due to a large capillary driving force. This study provides new insights on the origin of AGG with implications to the manufacture of single crystals. |
| Proceedings Inclusion? |
Planned: |