| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Solidification in External Fields
|
| Presentation Title |
Dynamic Nucleation Events in Zr-2.5Nb during Microgravity Electromagnetic Levitation Experiments |
| Author(s) |
Gwendolyn P. Bracker, Stephan Schneider, Robert W. Hyers |
| On-Site Speaker (Planned) |
Gwendolyn P. Bracker |
| Abstract Scope |
Electromagnetic levitation experiments depend on Lorenz forces and Joule heating from an applied electromagnetic field to control the sample position and temperature. However, the magnetic forces drive stirring and result in convective heat transport during processing. The additional stirring provided by the magnetic field has been shown to induce nucleation at sub-critical undercoolings where classical nucleation theory predicts the melt to remain liquid. These solidification instances have been attributed to dynamic nucleation in which local pressure variations, resulting from the fluid flow, may provide local conditions drive rapid growth of a sub-critical nucleus. In the ISS-EML facility, dynamic nucleation events have been observed in various zirconium and zirconium alloy samples using a variety of stirring conditions. The focus will be to discuss new results from experiments on Zr-2.5Nb which solidified during sustained, rapid stirring and to compare these results to prior experiments on pure zirconium. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Modeling and Simulation, Other |