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Macrosegregation in directionally solidified dendritic alloys

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Abstract

In this article, gravity-driven flow and its subsequent effect of promoting macrosegregation during unidirectional solidification of dendritic alloys is presented. Examples of macrosegregation that arise during the controlled directional solidification of hypo- and hypereutectic Pb−Sn alloys are shown, and a method of preventing macrosegregation is demonstrated. The experimental work is discussed in terms of how current knowledge of solute redistribution in a dendritic array can be promoted as well as how the processing technique might be applied to improve microstructural homogeneity during controlled directional solidification.

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  1. R. N. Grugel
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  2. L. N. Brush
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Additional information

Authors' Note: Excellent sources for historical information are Cyril Stanley Smith's booksA Search for Structure, A History of Metallography, andThe Science of Steel 1532–1786. We acknowledge that there were many early investigations regarding segregation phenomena that took place in countries other than the United States and Great Britain that have not been referenced. Furthermore, conference proceedings and reports are not included (e.g., prior to 1938, the British Iron and Steel Institute published seven reports on the heterogeneity of stel ingots). In trying to keep the discussion within the context of dendritic growth we do not, unfortunately, recognize the many important crystal growth/planar/cellular front investigations. Finally, there are certainly many recent and relevant contributions of which we are unaware and apologize for the lack of their inclusion.

R.N. Grugel earned his Ph.D. in metallurgical engineering at Michigan Technological University in 1983. He is currently a staff scientist at the Universities Space Research Association. He is also a member of TMS.

L.N. Brush earned his Ph.D. in metallurgical engineering and materials science at Carnegie Mellon University in 1988. He is currently associate professor at the University of Washington.

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Grugel, R.N., Brush, L.N. Macrosegregation in directionally solidified dendritic alloys. JOM 49, 26–30 (1997). https://doi.org/10.1007/BF02914652

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