The structure of directionally solidified two-phase Sn-Cd peritectic alloys View Full Text


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Article Info

DATE

1974-09

AUTHORS

W. J. Boettinger

ABSTRACT

The structure of Sn-Cd two-phase peritectic alloys directionally solidified at various values ofG/υ (temperature gradient in the liquid divided by growth rate) is reported. The minimum value of G/υ as a function of composition required for the solidification of two-phase peritectic alloys with a planar liquid-solid interface is estimated using a simple constitutional supercooling stability criterion. At a value ofG/υ just below this minimum value, these alloys solidify with a nonplanar interface consisting of cells of α (the high temperature phase) and intercellularβ (the low temperature phase). This produces a coarse rod-like microstructure consisting of rods of α phase imbedded in aβ matrix. At a value ofG/υ above this minimum value, these alloys solidify with a planar interface which alternately deposits bands of α andβ transverse to the growth direction. No coupled growth of α andβ at a planar interface is observed in Sn-Cd two-phase peritectic alloys as was expected. To understand this, an analysis of coupled (eutectic-like) growth of two-phase peritectic alloys is presented and contrasted with the results of the Jackson-Hunt theory of lamellar eutectic growth. This calculation indicates that the coupled growth of two-phase peritectic alloys is unlikely on theoretical grounds. More... »

PAGES

2023-2031

References to SciGraph publications

  • 1972-06. Effect of thermotransport upon off-eutectic composite growth in Sn-Pb alloys in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1971-12. The growth of lamellar eutectic structures in the Pb−Sn and Al−CuAl2 systems in METALLURGICAL AND MATERIALS TRANSACTIONS B
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    http://scigraph.springernature.com/pub.10.1007/bf02644495

    DOI

    http://dx.doi.org/10.1007/bf02644495

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