About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
|
Presentation Title |
New Insights in Controlling Freckle Defect Formation Using Magnetic Fields |
Author(s) |
Xianqiang Fan, Natalia Shevchenko, Catherine Tonry, Samuel J. Clark, Robert C. Atwood, Sven Eckert, Koulis Pericleous, Peter David Lee, Andrew Kao |
On-Site Speaker (Planned) |
Andrew Kao |
Abstract Scope |
Static magnetic fields have been shown to have a significant effect on channel formation in the GaIn freckle defect forming alloy. Inter-dendritic convective solute transport driven by the Thermoelectric Magnetoydrodynamics (TEMHD) phenomena leads to repositioning of the channel, preferential growth of secondary arms, plume migration and complex grain boundary interactions. This paper focuses on a secondary TEMHD mechanism that is generated by larger scale thermoelectric currents that circulate between the liquid and the entire mushy zone. This secondary mechanism is strongly dependent on the thermal profile and this leads to further modification of the bulk flow and ultimately plume migration. This mechanism has been observed by Xray synchrotron experiments and predicted by TESA (ThermoElectric Solidification Algorithm), a parallel Cellular Automata Lattice Boltzmann based numerical model, providing new insights into the intimate coupling between thermal solidification conditions and the effect of the magnetic field. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Solidification, Computational Materials Science & Engineering |