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Erschienen in: Journal of Materials Science: Materials in Electronics 7/2013

01.07.2013

Intermetallic growth study on SnAgCu/Cu solder joint interface during thermal aging

verfasst von: H. Xiao, X. Y. Li, Y. X. Zhu, J. L. Yang, J. Chen, F. Guo

Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2013

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Abstract

The intermetallic compound (IMC) growth behavior at SnAgCu/Cu solder joint interface under different thermal aging conditions was investigated, in order to develop a framework for correlating IMC layer growth behavior between isothermal and thermomechanical cycling (TMC) effects. Based upon an analysis of displacements for actual flip-chip solder joint during temperature cycling, a special bimetallic loading frame with single joint-shear sample as well as TMC tests were designed and used to research the interfacial IMC growth behavior in SnAgCu/Cu solder joint, with a focus on the influence of stress–strain cycling on the growth kinetics. An equivalent model for IMC growth was derived to describe the interfacial Cu-Sn IMC growth behavior subjected to TMC aging as well as isothermal aging based on the proposed “equivalent aging time” and “effective aging time”. Isothermal aging, thermal cycling (TC) and TMC tests were conducted for parameter determination of the IMC growth model as well as the growth kinetic analysis. The SnAgCu/Cu solder joints were isothermally aged at 125, 150 and 175 °C, while the TC and TMC tests were performed within the temperature range from −40 to 125 °C. The statistical results of IMC layer thickness showed that the IMC growth for TMC was accelerated compared to that of isothermal aging based on the same “effective aging time”. The IMC growth model proposed here is fit for predicting the IMC layer thickness for SnAgCu/Cu solder joint after any isothermal aging time or thermomechanical cycles. In addition, the results of microstructure evolution observation of SnAgCu/Cu solder joint subjected to TMC revealed that the interfacial zone was the weak link of the solder joint, and the interfacial IMC growth had important influence on the thermomechanical fatigue fracture of the solder joint.

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Metadaten
Titel
Intermetallic growth study on SnAgCu/Cu solder joint interface during thermal aging
verfasst von
H. Xiao
X. Y. Li
Y. X. Zhu
J. L. Yang
J. Chen
F. Guo
Publikationsdatum
01.07.2013
Verlag
Springer US
Erschienen in
Journal of Materials Science: Materials in Electronics / Ausgabe 7/2013
Print ISSN: 0957-4522
Elektronische ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-013-1128-z

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