Simultaneous melting and solidification of a columnar dendritic microstructure in a temperature gradient: Numerical modeling and experiments

. The microstructural evolution of a SCN-ACE alloy in a temperature gradient is studied by cellular automaton (CA) modeling and in situ experiments. The initially columnar dendrites gradually evolve to a completely solid region with a planar solid/liquid interface. The CA simulations and in situ obs...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2020, Vol.43 (1), p.5-5, Article 5
Main Authors: Xiang, Chongchen, Zhang, Qingyu, Sun, Dongke, Zhang, Shunhu, Zhu, Mingfang, Rettenmayr, Markus
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biophysics
Branching Dynamics at the Mesoscopic Scale
Casting
Cellular automata
Complex Fluids and Microfluidics
Complex Systems
Computer simulation
Condensed matter physics
Dendritic structure
Microstructure
Mushy zones
Nanotechnology
Physics
Physics and Astronomy
Polymer Sciences
Regular Article
Soft and Granular Matter
Solidification
Solidus
Supersaturation
Surfaces and Interfaces
Temperature dependence
Temperature gradients
Thin Films
Zone melting
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Summary:. The microstructural evolution of a SCN-ACE alloy in a temperature gradient is studied by cellular automaton (CA) modeling and in situ experiments. The initially columnar dendrites gradually evolve to a completely solid region with a planar solid/liquid interface. The CA simulations and in situ observations present the migration of secondary dendrite arms and liquid pockets due to temperature gradient zone melting (TGZM), and the movement of the interface between a mushy zone and a fully liquid zone. The CA simulations show that the interface movement toward the lower temperature region is caused by the increasing concentration of the fully liquid region. Through updating the concentration in the fully liquid zone to the initial concentration in the CA simulation for mimicking the efficient stirring in liquid, the movement of the interface between the mushy zone and the fully liquid zone is hindered. The simulated liquid fractions and mean concentrations throughout the mushy zone decrease with time, which agree well with the analytical predictions. The simulated concentrations in the resolidified mushy zone are not higher than the temperature-dependent solidus concentrations, implying that no supersaturation remains after the mushy zone fully solidifies. Graphical abstract
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2020-11930-7