A phase-field study on a eutectic high-entropy alloy during solidification

In the present work, we adopt a computational approach to study the evolution of microstructure during solidification of a Ti-Fe-Co-Ni-Cu multi-component alloy system by regarding it as a Ti-(Cu, Ni)-(Fe, Co) pseudo-ternary-alloy system. The as-cast alloy has a eutectic morphology with lamellar stru...

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Bibliographic Details
Published in:Philosophical magazine letters 2021-04, Vol.101 (4), p.160-172
Main Authors: Sagar, Boina, Biswas, Krishanu, Mukherjee, Rajdip
Format: Article
Language:English
Subjects:
Alloy systems
Casting alloys
Cobalt
Copper
Eutectic alloys
eutectic solidification
Eutectic temperature
Evolution
Finite element method
High entropy alloys
Iron
Lamellar structure
Laves phase
Microstructure
microstructure evolution
Morphology
multi-component alloy
Nickel
Phase-field model
Solid phases
Solidification
Supercooling
Titanium
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Summary:In the present work, we adopt a computational approach to study the evolution of microstructure during solidification of a Ti-Fe-Co-Ni-Cu multi-component alloy system by regarding it as a Ti-(Cu, Ni)-(Fe, Co) pseudo-ternary-alloy system. The as-cast alloy has a eutectic morphology with lamellar structure between (Cu) SS and a Laves phase. A Kim-Kim-Suzuki (KKS) phase-field model for eutectic solidification is implemented for this multi-component alloy system using a MOOSE finite element framework. The model is implemented for different scenarios, which include the simulation of microstructures at eutectic temperature and for small degrees of undercoolings (ΔT = 2°C, 5°C, 8°C, 10°C). Analysis of the microstructure evolution reveals that an increase in undercooling leads to a higher growth velocity and a larger volume fraction of solid phases.
ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2021.1877366