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Generalized Diffusive Speed for the Continuous Growth Model over a Wide Range of Solidification Velocities
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AI
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DOI：10.1016/j.scriptamat.2026.117536.png)
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Abstract
En 中文
Non-equilibrium interface kinetics, particularly solute trapping, dictates microstructure evolution and the formation of metastable phases during rapid solidification. The Continuous Growth Model (CGM) is widely used to describe solute trapping, but its predictive capability remains constrained by the persistent misconception that it applies only to low and medium velocities and the lack of an accurate predictive definition for the diffusive speed (vD). In this work, we derive a generalized definition of vD within the CGM framework, together with a thermodynamic-diffusive scaling relation for practical calculation from thermodynamic and diffusion information. Incorporating this new composition- and temperature-dependent vD generalizes the CGM to describe solute trapping over a wide range of solidification velocities, successfully capturing the transition to complete solute trapping. We validate the accuracy of the CGM across diverse binary systems and demonstrate its natural extension to multicomponent systems, establishing a robust foundation for predicting interface kinetics in complex engineering materials.
Keywords:
Rapid solidification
Kinetics
Thermodynamics
Solute trapping
Journal
IF:
5.6
Papers:
1.6W
Citations:
5.1W
Organization
Cited Papers