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Effect of bismuth on the growth kinetics of intermetallic compounds in Sn-3.5Ag solder joints: A growth kinetic model

Authors
Huh, JYHan, SUPark, CY
Issue Date
Apr-2004
Publisher
KOREAN INST METALS MATERIALS
Keywords
growth kinetics; intermetallic compounds; Sn-Ag-Bi solder; interfacial reaction barriers
Citation
METALS AND MATERIALS INTERNATIONAL, v.10, no.2, pp.123 - 131
Indexed
SCIE
SCOPUS
KCI
OTHER
Journal Title
METALS AND MATERIALS INTERNATIONAL
Volume
10
Number
2
Start Page
123
End Page
131
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123612
DOI
10.1007/BF03027315
ISSN
1598-9623
Abstract
The effect on the growth kinetics of the intermetallic compounds (IMCs) in solder/Cu joints, caused by adding Bi to eutectic Sn-3.5Ag solder alloy, was examined at the aging temperatures of 150degreesC and 180degreesC. The Cu6Sn5 layer growth was significantly enhanced, but the Cu3Sn layer growth was slightly retarded by the addition of Bi, resulting in significant growth enhancement of the total (Cu6Sn5+Cu3Sn) IMC layer with increasing Bi addition. The IMC layer growth in the Bi-containing solder joints was accompanied by the accumulation of Bi ahead of the Cu6Sn5 layer that resulted in the formation of a liquid layer at the Cu6Sn5/solder interface. A kinetic model was developed for the planar growth of the Cu6Sn5 and Cu3Sn layers in the solder joints, accounting for the existence of interfacial reaction barriers. Predictions from the kinetic model showed that the experimental results could be well explained by the hypothesis that the formation of a Bi-rich liquid layer at the Cu6Sn5/solder interface reduces the interfacial reaction barrier at the interface.
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College of Engineering (Department of Materials Science and Engineering)
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