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Effect of Sample Size on the Solidification Temperature and Microstructure of SnAgCu Near Eutectic Alloys

Published online by Cambridge University Press:  03 March 2011

R. Kinyanjui ,
L.P. Lehman ,
L. Zavalij  and
E. Cotts
R. Kinyanjui
Affiliation:
Department of Physics and Materials Science Program, Binghamton University, Binghamton, New York 13902
L.P. Lehman
Affiliation:
Department of Physics and Materials Science Program, Binghamton University, Binghamton, New York 13902
L. Zavalij
Affiliation:
Department of Physics and Materials Science Program, Binghamton University, Binghamton, New York 13902
E. Cotts
Affiliation:
Department of Physics and Materials Science Program, Binghamton University, Binghamton, New York 13902
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Abstract

The degree of undercooling of Sn in near eutectic, SnAgCu solder balls upon cooling at a rate of 1 °C/s from the melt was examined and found to increase linearly with inverse nominal sample diameter (for balls of radius between 100 and 1000 μm). The mean undercooling for SnAgCu solder balls in a flip chip assembly was 62 °C. The microstructures of these different samples were examined by means of scanning electron microscopy. The Sn dendrite arm width was observed to monotonically increase with ball diameter, indicating a possible dependence of the mechanical response of such solder balls upon size.

Keywords

CalorimetryOptical metallographyRapid solidification

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Type
Articles
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Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 2914 - 2918
Copyright
Copyright © Materials Research Society 2005

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