A phase-field-crystal alloy model for late-stage solidification studies involving the interaction of solid, liquid and gas phases

Nan Wang, Gabriel Kocher, Nikolas Provatas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present a multiphase binary alloy phase-field-crystal model. By introducing density difference between solid and liquid into a previous alloy model, this new fusion leads to a practical tool that can be used to investigate formation of defects in late-stage alloy solidification. It is shown that this model can qualitatively capture the liquid pressure drop due to solidification shrinkage in confined geometry. With an inherited gas phase from a previous multiphase model, cavitation of liquid from shrinkage-induced pressure is also included in this framework. As a unique model that has both solute concentration and pressure-induced liquid cavitation, it also captures a modified Scheil–Gulliver-type segregation behaviour due to cavitation. Simulation of inter-dendritic channel solidification using this model demonstrates a strong cooling rate dependence of the resulting microstructure. This article is part of the theme issue ‘From atomistic interfaces to dendritic patterns’.

Original languageEnglish
Article number20170212
JournalPhilosophical transactions. Series A, Mathematical, physical, and engineering sciences
Volume376
Issue number2113
DOIs
StatePublished - 28 Feb 2018

Keywords

  • Defects
  • Phase field
  • Shrinkage
  • Solidification

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