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Effect of convection on the microstructure of the MnBi/Bi eutecticFor the quasi-regular fibrous microstructure of MnBi formed at freezing rates of 9 mm/h and above, good agreement between experimental and theoretical results for fiber spacing, freezing rate, radial position, and ampoule rotation rate is found. For the irregular blade-like microstructure formed at lower freezing rates, convection is found to coarsen the microstructure somwhat more than predicted. The volume fraction of MnBi was also shown to depend on ampoule rotation and radial position, even in the absence of ampoule rotation. The two-fold finer microstructure observed in space-processed material could not be explained by the elimination of buoyancy-driven natural convection.
Document ID
19870049475
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Eisa, Gaber Faheem
(Clarkson Univ. Potsdam, NY, United States)
Wilcox, william R.
(Clarkson University Potsdam, NY, United States)
Busch, Garrett
(Grumman Corporate Research Center Bethpage, NY, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: Journal of Crystal Growth
Volume: 78
Issue: 1 c
ISSN: 0022-0248
Subject Category
Solid-State Physics
Accession Number
87A36749
Funding Number(s)
CONTRACT_GRANT: NAG8-480
Distribution Limits
Public
Copyright
Other

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