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Phase selection during crystallization of undercooled liquid eutectic lead-tin alloysDuring rapid solidification substantial amounts of undercooling are in general required for formation of metastable phases. Crystallization at varying levels of undercooling and melting of metastable phases were studied during slow cooling and heating of emulsified PB-Sn alloys. Besides the experimental demonstration of the reversibility of metastable phase equilibra, two different principal solidification paths have been identified and compared with the established metastable phase diagram and predictions from classical nucleation theory. The results suggest that the most probable solidification path is described by the 'step rule' resulting in the formation of metastable phases at low undercooling, whereas the stable eutectic phase mixture crystallizes without metastable phase formation at high undercooling.
Document ID
19910049802
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fecht, H. J.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Acta Metallurgica et Materialia
Volume: 39
ISSN: 0956-7151
Subject Category
Metallic Materials
Accession Number
91A34425
Distribution Limits
Public
Copyright
Other

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