Vertical solidification of dendritic binary alloys

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

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This paper addresses the effect of thermosolutal convection in the formation of defects in directionally solidified (DS) alloys. Three different models have been used as the basis for numerical simulations of the solidification process, and all use the Boussinesq approximation. In increasing order of complexity, the three are the plane-front model, an extension of the plane-front model that includes a dendritic region with a time-independent volume fraction of liquid, and a model where the dendritic region is free to develop according to local equilibrium conditions and that is capable of predicting channel segregates or freckles. Finite element models of thermosolutal convection have been developed for all three cases and have been used to investigate nonlinear convection when the systems are unstable. The dendritic or mushy region is treated as a porous medium with variable porosity; the algorithm is based on a Petrov-Galerkin and penalty function formulation using the four-noded bilinear Lagrangian element with reduced integration of the penalty term. Calculations are presented for lead-tin alloys at different concentrations of tin and for various temperature gradients. Also shown are calculations in which freckles develop in DS alloys - the first of their kind. The results of the numerical calculations are discussed and compared to experimental observations and other theoretical analyses.

Original languageEnglish (US)
Pages (from-to)435-461
Number of pages27
JournalComputer Methods in Applied Mechanics and Engineering
Volume89
Issue number1-3
DOIs
StatePublished - 1991

Fingerprint

Binary alloys
binary alloys
solidification
Solidification
convection
penalty function
tin alloys
Tin alloys
Boussinesq approximation
lead alloys
Lead alloys
penalties
Thermal gradients
Tin
Porous materials
Volume fraction
tin
temperature gradients
Porosity
porosity

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Mechanics

Cite this

Vertical solidification of dendritic binary alloys. / Heinrich, J. C.; Felicelli, S.; Poirier, David R.

In: Computer Methods in Applied Mechanics and Engineering, Vol. 89, No. 1-3, 1991, p. 435-461.

Research output: Contribution to journalArticle

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