| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification Science VIII
|
| Presentation Title |
Probing the Growth Dynamics of Eutectic Colonies in Zn-Al via X-ray Video Microscopy |
| Author(s) |
Yeqing Wang, Jianrong Gao, Ashwin Shahani |
| On-Site Speaker (Planned) |
Ashwin Shahani |
| Abstract Scope |
Eutectic Zn-Al is an attractive anode material for aqueous rechargeable batteries. It is of fundamental and technical interest to investigate their solidification behavior in casting. In this work, we probe the eutectic solidification process in Zn-5wt%Al alloys via synchrotron-based, in situ X-ray radiography. We observe the formation and elimination of two‑phase cells or colonies as growth proceeds, suggesting that the solidification front is inherently unstable. Colonies increase in number when one colony splits into two, and decrease in number when one colony is overgrown by its neighbors, in agreement with recent phase field simulations. Our results also demonstrated that the relationship between undercooling and growth velocity does not agree with predictions from the Jackson-Hunt criterion, owing to the presence of thermo-solutal convection. The evolution of the eutectic colonies, and their interaction with fluid flow, will be presented and discussed. |
| Proceedings Inclusion? |
Planned: |