|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Growth Competition between Columnar Dendritic Grains - The Role of Microstructural Length Scales
||Elaheh Dorari, Kaihua Ji, Gildas Guillemot, Charles-Andre Gandin, Alain Karma
|On-Site Speaker (Planned)
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.
||Solidification, Modeling and Simulation, Characterization