About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Frontiers in Solidification Science VIII
|
Presentation Title |
Grain Competition in Polycrystalline Columnar Dendritic Solidification: Scale Bridging between Phase Field and Cellular Automaton Methods |
Author(s) |
Elaheh Dorari, Kaihua Ji, Gildas Guillemot, Charles-Andre Gandin, Alain Karma |
On-Site Speaker (Planned) |
Elaheh Dorari |
Abstract Scope |
The growth competition amongst different grains during dendritic solidification has a crucial influence on the final microstructure, material properties and performance of the cast parts. A quantitative understanding of the dynamical selection of the grain boundary (GB) orientation during polycrystalline dendritic growth is still lacking. In this study, we present a comprehensive phase-field (PF) investigation of columnar dendritic grain competition in a succinonitrile-1.3 wt% acetone sample in two dimensions. The PF model of alloy solidification exploits a novel rotationally invariant finite-difference scheme of the anti-trapping current to accurately resolve the dendrite tip operating state of misoriented grains. We discuss the combined role of the temperature gradient and the grain orientations in the selection of GB orientation. Comparison with Cellular Automaton results derived under the same conditions as well as different GB selection criteria are performed, and the pertinence of the CA method for predicting the GB selection is discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Additive Manufacturing, Modeling and Simulation |