Dendritic to globular morphology transition in ternary alloy solidification
Denis Danilov, Britta Nestler
TL;DR
This study uses advanced simulations to explore how changing alloy composition causes a smooth transition from dendritic to globular microstructures during solidification.
Contribution
It introduces a phase-field simulation approach to analyze morphological transitions in ternary alloy solidification.
Findings
Transition from dendritic to globular structures with composition change
Growth velocity varies smoothly across the transition
Impurity segregation patterns depend on alloy composition
Abstract
The evolution of solidification microstructures in ternary metallic alloys is investigated by adaptive finite element simulations of a general multicomponent phase-field model. A morphological transition from dendritic to globular growth is found by varying the alloy composition at a fixed undercooling. The dependence of the growth velocity and of the impurity segregation in the solid phase on the composition is analyzed and indicates a smooth type of transition between the dendritic and globular growth structures.
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