Three-dimensional simulations of freckles in binary alloys

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

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A tridimensional finite-element model was developed to calculate the thermosolutal convection and macrosegregation during the solidification of dendritic alloys. A single set of conservation equations is solved in the mushy zone, all-liquid, and all-solid regions without internal boundary conditions. The model is applied to simulate the directional solidification of a Pb-Sn alloy in cylinders of square and circular cross section. The calculations are started from an all-liquid state and the evolution of convection, solute and energy transport, and the mushy zone growth are followed in time. The results show details of the channels, which result in freckles, that are not observable in existing two-dimensional simulations. Several qualitative features of channels and freckles previously observed in experiments with transparent systems, like chimney convection, preference of channels to be on surfaces, and enhanced solid growth at the channel mouth ("volcanoes") are successfully reproduced.

Original languageEnglish (US)
Pages (from-to)879-888
Number of pages10
JournalJournal of Crystal Growth
Volume191
Issue number4
StatePublished - Aug 1 1998

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Binary alloys
binary alloys
mushy zones
convection
Solidification
Chimneys
Volcanoes
simulation
Liquids
chimneys
mouth
conservation equations
Conservation
liquids
Boundary conditions
volcanoes
solidification
solutes
boundary conditions
Convection

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Three-dimensional simulations of freckles in binary alloys. / Felicelli, S. D.; Heinrich, J. C.; Poirier, David R.

In: Journal of Crystal Growth, Vol. 191, No. 4, 01.08.1998, p. 879-888.

Research output: Contribution to journalArticle

Felicelli, SD, Heinrich, JC & Poirier, DR 1998, 'Three-dimensional simulations of freckles in binary alloys', Journal of Crystal Growth, vol. 191, no. 4, pp. 879-888.
Felicelli, S. D. ; Heinrich, J. C. ; Poirier, David R. / Three-dimensional simulations of freckles in binary alloys. In: Journal of Crystal Growth. 1998 ; Vol. 191, No. 4. pp. 879-888.
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