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A critical examination of the dendrite growth models Comparison of theory with experimental dataThree dendrite growth models for directionally solidified succinonitrile-acetone, succinonitrile-salol, aluminum-copper, and lead-paladium alloys are evaluated. The characteristics of the Burden and Hunt (1974) model, the Laxmanan (1985) model, and the Trivedi (1980) model are described. The dendrite tip temperature, tip radius, liquid composition, and primary arm spacing for the alloys are analyzed in terms of growth speed, alloy composition, and temperature gradient. It is observed that the Burden and Hunt model accurately predicts the proper behavior of the parameters, but does not provide good quantitative predictions. A good fit between the experimental data and the Trivedi and Laxmanan models is detected. The advantages of the Trivedi marginal stability analysis and the Laxmanan minimum dendrite tip undercooling approaches are discussed.
Document ID
19870037774
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tewari, S. N.
(NASA Lewis Research Center Cleveland, OH, United States)
Laxmanan, V.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Acta Metallurgica
Volume: 35
ISSN: 0001-6160
Subject Category
Metallic Materials
Accession Number
87A25048
Distribution Limits
Public
Copyright
Other

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