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Solidification of highly undercooled Sn- Pb alloy droplets

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Abstract

Experimental work is described on undercooling and structure of tin-lead droplets emulsified in oil. The droplets, predominantly in the size range of 10 to 20 μm, were cooled at rates (just before nucleation) ranging from about 10-1 K per second to 106 K per second. The higher cooling rates were obtained by a newly developed technique of quenching the emulsified droplets in a cold liquid. Measured undercoolings (at the lower cooling rates) ranged up to about 100 K. Structures obtained depend strongly on undercooling, cooling rate before and after nucleation, and alloy composition. Droplets containing up to 5 wt pct Pb were apparently single phase when undercooled and rapidly quenched. Droplets in the composition range of about 25 wt pct to 90 wt pct Pb solidified dendritically, even at the most rapid quench rates employed, apparently because these alloys undercooled only slightly before nucleation of the primary phase.

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Authors and Affiliations

  1. Alcoa Laboratories, Alcoa Center, 15069, PA

    M. G. Chu (Senior Scientist)

  2. Materials Processing Center, Massachusetts Institute of Technology, USA

    Y. Shiohara (Research Associate,Special Postdoctoral Research Fellow)

  3. Castings Research Laboratory of Waseda University, Tokyo, Japan

    Y. Shiohara (Research Associate,Special Postdoctoral Research Fellow)

  4. Massachusetts Institute of Technology, 02139, Cambridge, MA

    M. C. Flemings (Toyota Professor of Materials Processing and Head of the Department of Materials Science and Engineering)

Authors
  1. M. G. Chu
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  2. Y. Shiohara
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  3. M. C. Flemings
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Formerly Graduate Research Assistant and Postdoctoral Associate in the Department of Materials Science and Engineering, Massachusetts Institute of Technology.

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Chu, M.G., Shiohara, Y. & Flemings, M.C. Solidification of highly undercooled Sn- Pb alloy droplets. Metall Trans A 15, 1303–1310 (1984). https://doi.org/10.1007/BF02648558

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  • DOI: https://doi.org/10.1007/BF02648558

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