Eutectic growth in two-phase multicomponent alloys

Oriane Senninger*, Peter W. Voorhees

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A theory of two-phase eutectic growth for a multicomponent alloy is presented. Using the same hypotheses as the Jackson-Hunt theory, we find that the growth law of the microstructure given by Jackson and Hunt for binary alloys can be generalized to systems with N elements. Thermodynamic parameters involved in this theory are linked to the Gibbs free energies of the phases which makes it possible to compute these parameters with CALPHAD tools. A model is derived from this general theory for ternary alloys which does not contain any assumptions on the alloy thermodynamic properties, contrary to previous models. We find that a small addition of a ternary alloying element with a small diffusivity to a binary alloy can significantly alter the spacing of the eutectic.

Original languageEnglish (US)
Pages (from-to)308-320
Number of pages13
JournalActa Materialia
Volume116
DOIs
StatePublished - Sep 1 2016

Keywords

  • CALPHAD
  • Diffusion
  • Eutectic solidification
  • Multicomponent
  • Ternary alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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