Eutectic growth from cellular to dendritic form in the undercooled Ag–Cu eutectic alloy melt

The solidification structure of Ag–Cu eutectic alloy at different undercoolings was investigated. A critical undercooling of 76 K is revealed, at which a transition from cellular to dendritic growth of lamellar eutectic occurs, accompanied with an abrupt rise of growth velocity. It is suggested that...

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Bibliographic Details
Published in:Journal of crystal growth 2009-02, Vol.311 (5), p.1387-1391
Main Authors: Zhao, Su, Li, Jinfu, Liu, Li, Zhou, Yaohe
Format: Article
Language:English
Subjects:
A1. Crystal morphology
A1. Growth models
A1. Microstructures
A1. Rapid solidification
A1. Undercooling
B1. Eutectic alloy
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of crystal growth
physics of crystal growth
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Solidification
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:The solidification structure of Ag–Cu eutectic alloy at different undercoolings was investigated. A critical undercooling of 76 K is revealed, at which a transition from cellular to dendritic growth of lamellar eutectic occurs, accompanied with an abrupt rise of growth velocity. It is suggested that the large difference in composition between the two eutectic phases and the very large thermal diffusion coefficient of the liquid result in the cellular growth of lamellar eutectic at low undercoolings.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2008.12.006