Development of Phase-Field model for studying rapid solidification by incorporating continuous growth model kinetics

Mitchell, Bashir (2024). Development of Phase-Field model for studying rapid solidification by incorporating continuous growth model kinetics. University of Birmingham. Ph.D.

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Abstract

This work aims to improve the accuracy of phase field modelling for scenarios under which extremely rapid and far from equilibrium solidification occurs. The evolution of microstructure is highly dependent on the exchange of solute and heat at the interface between the solid and liquid phases, thus in order to accurately model microstructure evolution it is necessary to have an accurate model of phase growth and solute redistribution. The novelty of this work is to directly map the phase growth and solutal redistribution processes proposed continuous growth model, widely used to characterise the relation between interface velocity and solute partitioning, to a phase field model. This allows parameters derived from 1-D rapid solidification experiments to be used directly in phase field models that could make prediction of microstructure morphology in 2 or 3 dimensions. This work also investigates the properties of redistributive fluxes, how they compare to number fixed frame fluxes in the context of diffusion, and how they could be used to characterise redistribution of solute in more complex alloy systems.

Type of Work:

Thesis (Doctorates > Ph.D.)

Award Type:

Doctorates > Ph.D.

Supervisor(s):