Channel formation in Pb-Sn, Pb-Sb, and Pb-Sn-Sb alloy ingots and comparison with the system NH4CI-H2O View Full Text


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Article Info

DATE

1988-07

AUTHORS

J. R. Sarazin, A. Hellawell

ABSTRACT

The formation of segregation channels during the unidirectional solidification of base chilled ingots has been studied as a function of composition in binary Pb-Sn and Pb-Sb and ternary Pb-Sn-Sb alloys. The patterns of channel distribution were characterized in the binary and ternary systems and are described as functions of temperature gradients, growth rates, dendrite spacings, and interdendritic permeabilities. Channels appear to nucleate at random across a dendritic front and subsequently to interact as they propagate, decreasing in density across the front. Assuming that the interdendritic spacing is the characteristic distance for a liquid perturbation, yields critical effective Rayleigh numbers which lie within a factor of x40 for both metallic and aqueous systems. This correlation is close, considering the sensitivity to any assumed dimension and the range of material properties involved, and is taken to support a model for channel nucleation occurring close to the dendritic growth front. More... »

PAGES

1861-1871

References to SciGraph publications

  • 1970-08. The origin of freckles in unidirectionally solidified castings in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1984-12. Thermosolutal convection during directional solidification in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1985-09. Influence of dendrite network defects on channel segregate growth in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1984-12. The mechanisms of formation and prevention of channel segregation during alloy solidification in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1987. Local Convective Flows in Partly Solidified Alloys in STRUCTURE AND DYNAMICS OF PARTIALLY SOLIDIFIED SYSTEMS
  • 1982-09. The effect of mold precession on channel and macro-segregation in ammonium chloride-water analog castings in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1970-06. Convective Fluid Motion Within the Interdendritic Liquid of a Casting in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://dx.doi.org/10.1007/bf02645156

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