Convective influence on radial segregation during unidirectional solidification of the binary alloy HgCdTe

Dale A. Watring; Donald C. Gillies; Sandor L. Lehoczky; Frank R. Szofran; Helga A. Alexander

doi:10.1117/12.244358

12 July 1996 Convective influence on radial segregation during unidirectional solidification of the binary alloy HgCdTe

Dale A. Watring, Donald C. Gillies, Sandor L. Lehoczky, Frank R. Szofran, Helga A. Alexander

Proceedings Volume 2809, Space Processing of Materials; (1996) https://doi.org/10.1117/12.244358
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

In order to stimulate the space environment for basic research into the crystal growth mechanism, Hg_0.8Cd_0.2Te 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 Hg_0.8Cd_0.2Te crystal grown without field and also in the microgravity environment of space during the second United States Microgravity Payload Mission.

Citation Download Citation

Dale A. Watring, Donald C. Gillies, Sandor L. Lehoczky, Frank R. Szofran, and Helga A. Alexander "Convective influence on radial segregation during unidirectional solidification of the binary alloy HgCdTe", Proc. SPIE 2809, Space Processing of Materials, (12 July 1996); https://doi.org/10.1117/12.244358

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