Macrosegregation patterns in multicomponent Ni-base alloys

S. D. Felicelli, D. R. Poirier, J. C. Heinrich

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

A mathematical model of the dendritic solidification of multicomponent alloys, that includes thermosolutal convection and macrosegregation, is presented. The model is an extension of one previously developed for binary alloys. Numerical simulations are given for ternary and quaternary Ni-base alloys, and the evolution of macrosegregation during solidification is studied. The results show that the segregation patterns vary greatly with cooling conditions, adopting several shapes and levels of intensity. Calculations of segregation in rectangular molds and in molds with smooth and abrupt variations of the cross sections exhibit significant differences in the distribution of macrosegregation due to the change in geometry. In addition, the segregation patterns are found to be particularly sensitive to the values of the equilibrium partition coefficients of the alloy components.

Original languageEnglish (US)
Pages (from-to)145-161
Number of pages17
JournalJournal of Crystal Growth
Volume177
Issue number1-2
DOIs
StatePublished - May 1997

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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