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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Phase Transformations and Microstructural Evolution
Presentation Title Growth Competition between Columnar Dendritic Grains - The Role of Microstructural Length Scales
Author(s) Elaheh Dorari, Kaihua Ji, Gildas Guillemot, Charles-Andre Gandin, Alain Karma
On-Site Speaker (Planned) Elaheh Dorari
Abstract Scope During alloy solidification in material processing, such as casting and additive manufacturing, competitive growth occurs between columnar dendritic grains. As a result, grain boundaries (GBs) form with distinct microstructural features. We present the results of a comprehensive study based on quantitative phase-field (PF) simulations for bicrystal orientations. The transition from FOG to GL regimes is retrieved when decreasing the temperature gradient. We use the computed microstructural length scales at the GB to bridge Cellular Automaton (CA) and PF prediction of the GB orientation. Despite its inherent approximations, we demonstrate that the CA retrieves the PF results providing the choice of a cell size equal to the active secondary dendrite arm spacing. This result paves the path for future developments of the CA method.
Proceedings Inclusion? Planned:
Keywords Solidification, Modeling and Simulation, Characterization

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