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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Veröffentlicht in:	Journal of crystal growth 2009-02, Vol.311 (5), p.1387-1391
Hauptverfasser:	Zhao, Su, Li, Jinfu, Liu, Li, Zhou, Yaohe
Format:	Artikel
Sprache:	eng
Schlagworte:	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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Beschreibung
Zusammenfassung:	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