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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Thermodynamics and Kinetics of Alloys IV
Presentation Title Quantitative phase-field modeling of nonequilibrium microstructural evolution in rapid solidification
Author(s) Yijia Gu, Leiji Li, Fei Xiao, Xuejun Jin
On-Site Speaker (Planned) Yijia Gu
Abstract Scope Fusion-based metal additive manufacturing (AM) involves rapid solidification, resulting in distinct microstructures that directly impact material performance. Central to this solidification regime is solute trapping, a nonequilibrium effect characterized by a velocity-dependent partition coefficient, which strongly influences phase selection, morphology, and microstructural development. In this work, we employ a quantitative phase field (PF) modeling framework to systematically investigate the interplay between solute trapping, solute drag, and microstructural development at AM-relevant solidification velocities in one and two dimensions. Our simulations reveal a growth mode transition from planar to cellular to dendritic, and back to cellular and planar, consistent with classical solidification theory. The PF model-generated solidification microstructure selection map, as well as primary dendrite and cell spacings, show strong agreement with experimental observations. These results demonstrate the predictive capability of quantitative PF modeling in capturing complex microstructure formation during rapid solidification, providing a valuable tool for guiding microstructure control in AM.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Computational Materials Science & Engineering, Modeling and Simulation

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