About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Thermodynamics and Kinetics of Alloys
|
Presentation Title |
The Selection of Solidification Pathway in Rapid Solidification Processes |
Author(s) |
Nima Najafizadeh, Yijia Gu |
On-Site Speaker (Planned) |
Nima Najafizadeh |
Abstract Scope |
Rapid solidification processing of alloys enables the formation of exotic non-equilibrium microstructures. However, the interrelationship between the processing parameters and the resulting microstructure is yet to be fully understood. In melt spinning and additive manufacturing of rapidly solidified alloys, opposite microstructure development sequences were observed. A fine-to-coarse microstructural transition is typically observed in melt-spun ribbon, while a coarse-to-fine transition pattern is shown in AM melt pools. In this work, the microstructural evolutions during these two processes are investigated using phase-field modeling. It is found that the onset of nucleation determines the selection of solidification pathway and consequently the development of those different microstructures. The switching of control mechanisms of the solid-liquid interface, which happens in both processes but in opposite directions, is found to cause the velocity jump and disrupt the microstructure development. |
Proceedings Inclusion? |
Planned: |