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Directional solidification of Cu- Pb and Bi- Ga monotectic alloys under normal gravity and during parabolic flight

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Abstract

Cu-Pb and Bi-Ga monotectic alloys of nominal hypermonotectic compositions were directionally solidified under various furnace translation rates, temperature gradients, and gravity levels. Gravity was varied by solidifying the alloys under ground conditions and in the furnace aboard NASA KC-135 aircraft, flying on parabolic trajectories. High translation rates, high gradients, high gravity levels, and higher density and lower thermal conductivity of the L2 phase favored the formation of fiber composite structure, while the opposite conditions resulted in structures consisting of L2 droplets in α matrix. A modified particle engulfment theory as originally enunciated by Ulhmannet al. is proposed to explain these observations.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, The University of Alabama, P. O. Box G, 35487, Tuscaloosa, AL

    B. K. Dhindaw (permanent position: Professor at IIT Kharagpur,India), Visiting Scholar) & D. M. Stefanescu (Professor)

  2. Inland Steel, East Chicago, Indiana

    A. K. Singh

  3. NASA/Marshall Space Flight Center, 35812, Huntsville, AL

    P. A. Curreri (Materials Scientist)

Authors
  1. B. K. Dhindaw
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  2. D. M. Stefanescu
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  3. A. K. Singh
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  4. P. A. Curreri
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Formerly Graduate Student, Department of Metallurgical Engineering, The University of Alabama,

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Dhindaw, B.K., Stefanescu, D.M., Singh, A.K. et al. Directional solidification of Cu- Pb and Bi- Ga monotectic alloys under normal gravity and during parabolic flight. Metall Trans A 19, 2839–2846 (1988). https://doi.org/10.1007/BF02645818

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  • DOI: https://doi.org/10.1007/BF02645818

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