The effect of fluid flow on eutectic growth View Full Text


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Article Info

DATE

2005-11

AUTHORS

J. H. Lee, Shan Liu, R. Trivedi

ABSTRACT

The effect of fluid flow on eutectic microstructure is systematically examined in Al-Cu alloys of compositions varying from 19.5 to 45.0 wt pct Cu. It is shown that significantly different fluid-flow effects are present in hypo- and hypereutectic alloys, since the modes of convection are different in these two cases. In hypoeutectic alloys, the rejected solute is copper, which is heavier than aluminum, and fluid flow gives rise to radial solute segregation in cylindrical samples. In hypereutectic alloys, a lighter aluminum is rejected that causes a double diffusive convection and gives rise to macrosegregation. These composition variations are shown to produce nonuniform microstructures that vary either radially (in hypoeutectic alloys) or axially (in hypereutectic alloys) and can give rise to a single phase-to-eutectic, lamellar-to-rod eutectic, or rod-to-lamellar eutectic transition in a given sample. Composition measurements are carried out to characterize solute segregation due to fluid flow. The fluid-flow effect on eutectic spacing in eutectic or near-eutectic alloys is found to be very small, whereas it increases the eutectic spacing in hypoeutectic alloys for a given local composition and it can increase or decrease the spacing in hypereutectic alloys, depending on the microstructure and solidification fraction. Theoretical models, based on diffusive grwoth, are modified to predict the spatio-temporal variation in eutectic microstructure caused by fluid flow. More... »

PAGES

3111-3125

References to SciGraph publications

  • 1984-09. Primary dendrite spacing: Part II. Experimental studies of Pb-Pd and Pb-Au alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2000-04. A model of convection-induced oscillatory structure formation in peritectic alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2004-10. Diffusion-coefficient measurements in liquid metallic alloys in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1984-12. Convection-induced distortion of a solid-liquid interface in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1971-12. The growth of lamellar eutectic structures in the Pb−Sn and Al−CuAl2 systems in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1980-11. Primary dendrite spacing of lead dendrites in Pb-Sn and Pb-Au Alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2002-12. The effect of convection on disorder in primary cellular and dendritic arrays in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2003-12. Effect of crucible diameter reduction on the convection, macrosegregation, and dendritic morphology during directional solidification of Pb-2.2 wt pct Sb alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1976-08. Interlamellar spacing measurements in the Sn-Pb and Al-CuAl2 Eutectic Systems in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2004-06. Overstability of lamellar eutectic growth below the minimum-undercooling spacing in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    URI

    http://scigraph.springernature.com/pub.10.1007/s11661-005-0083-6

    DOI

    http://dx.doi.org/10.1007/s11661-005-0083-6

    DIMENSIONS

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