Microstructural development in undercooled lead- tin eutectic alloys View Full Text


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Article Info

DATE

1995-10-01

AUTHORS

FaY Hua, R. N. Grugel

ABSTRACT

A model was developed to predict micro structural development in lead—61.9 wt pct Sn (eutectic) alloys which were undercooled 5 to 25 K below their equilibrium freezing temperature prior to being preferentially nucleated. While the initial solidification velocity rapidly increases with increasing undercooling, the model predicts it to quickly decrease, prior to 10 pct solid formation, after which growth continues near the equilibrium temperature. Experimentally, and in accordance with the prediction, the eutectic emanated from the nucleation site with an initially fine spacing that increased with distance. However, in contrast to the model, the eutectic grew outward in a spokelike manner with each arm surrounded by a globular structure, this being attributed to the difficulty of lateral nucleation. Microstructural uniformity was further compromised by equiaxed eutectic grains which grew ahead of the advancing interface in the now only slightly undercooled liquid. Consequently, while containerless techniques may ensure sample purity and permit processing of high-temperature materials, development of a continuously fine and uniformly aligned microstructure cannot be assumed. More... »

PAGES

2699-2706

References to SciGraph publications

  • 1988-12. Eutectic growth: Selection of interlamellar spacings in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1991-10. Eutectic spacing selection in lead-based alloy systems in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1988-11. Bulk undercooling, nucleation, and macrosegregation of Pb-Sn alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1989-05. Metastable phase equilibria in the lead-tin alloy system: Part I. Experimental in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1972-06. Interface undercoolings during the growth of Pb-Sn eutectics in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1982-02. Heat Flow during Rapid Solidification of Undercooled Metal Droplets in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1989-05. Metastable phase equilibria in the lead-tin alloy system: Part II. Thermodynamic modeling in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1991-08. Numerical simulation of a solidifying Pb-Sn alloy: The effects of cooling rate on thermosolutal convection and macrosegregation in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1984-07. Solidification of highly undercooled Sn- Pb alloy droplets in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://scigraph.springernature.com/pub.10.1007/bf02669426

    DOI

    http://dx.doi.org/10.1007/bf02669426

    DIMENSIONS

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