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Proceedings Paper

Convective influence on radial segregation during unidirectional solidification of the binary alloy HgCdTe
Author(s): Dale A. Watring; Donald C. Gillies; Sandor L. Lehoczky; Frank R. Szofran; Helga A. Alexander
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Paper Abstract

In order to stimulate the space environment for basic research into the crystal growth mechanism, Hg0.8Cd0.2Te crystals were grown by the vertical Bridgman- Stockbarger method in the presence of an applied axial magnetic field. The influence of convection, by magneto hydrodynamic damping, on mass transfer in the melt and segregation at the solid-liquid interface was investigated by measuring he axial and radial compositional variations in the grown samples. The reduction of convective mixing in the melt through the application of the magnetic field is found to have a large effect on radial segregation and interface morphology in the grown crystals. Direct comparisons are made with a Hg0.8Cd0.2Te crystal grown without field and also in the microgravity environment of space during the second United States Microgravity Payload Mission.

Paper Details

Date Published: 12 July 1996
PDF: 12 pages
Proc. SPIE 2809, Space Processing of Materials, (12 July 1996); doi: 10.1117/12.244358
Show Author Affiliations
Dale A. Watring, NASA Marshall Space Flight Ctr. (United States)
Donald C. Gillies, NASA Marshall Space Flight Ctr. (United States)
Sandor L. Lehoczky, NASA Marshall Space Flight Ctr. (United States)
Frank R. Szofran, NASA Marshall Space Flight Ctr. (United States)
Helga A. Alexander, Universities Space Research Association (United States)

Published in SPIE Proceedings Vol. 2809:
Space Processing of Materials
Narayanan Ramachandran, Editor(s)

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