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Macrosegregation during plane front directional solidification of Csl-1 wt. percent Tll alloyMacrosegregation produced during vertical Bridgeman directional solidification of Csl-1 wt. pct. Tll in crucibles of varying diameter, from 0.5 to 2.0 cm, was examined. Gravity driven convection is present in the melt even in the smallest crucible diameter of 0.5 cm. Observed solutal profiles are in agreement with the analytical boundary layer model of Favier which describes macrosegregation in the presence of convection. The scintillation efficiency of Csl decreases along the specimen length as the thallium iodide content of the alloy increases.
Document ID
19920016892
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Sidawi, I. M. S. (Cleveland State Univ. OH, United States)
Tewari, S. N. (Cleveland State Univ. OH, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Subject Category
Materials Processing
Report/Patent Number
NAS 1.26:190360
NASA-CR-190360
Accession Number
92N26135
Funding Number(s)
CONTRACT_GRANT: NCC3-96
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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