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Direct observation of interface instability during crystal growthThe general aim of this investigation was to study interface stability and solute segregation phenomena during crystallization of a model system. Emphasis was to be placed on direct observational studies partly because this offered the possibility at a later stage of performing related experiments under substantially convection-free conditions in the space shuttle. The major achievements described in this report are: (1) the development of a new model system for fundamental studies of crystal growth from the melt and the measurement of a range of material parameters necessary for comparison of experiment with theory. (2) The introduction of a new method of measuring segregation coefficient using absorption of a laser beam by the liquid phase. (3) The comparison of segregation in crystals grown by gradient freezing and by pulling from the melt. (4) The introduction into the theory of solute segregation of an interface field term and comparison with experiment. (5) The introduction of the interface field term into the theories of constitutional supercooling and morphological stability and assessment of its importance.
Document ID
19820015159
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Tiller, W. A.
(Stanford Univ. CA, United States)
Feigelson, R. S.
(Stanford Univ. CA, United States)
Elwell, D.
(Stanford Univ. CA, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1982
Subject Category
Solid-State Physics
Report/Patent Number
NASA-CR-161999
CMR-82-19
NAS 1.26:161999
SU-CMR-82-19
Accession Number
82N23033
Funding Number(s)
CONTRACT_GRANT: NAS8-33110
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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