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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Chen, H.T. Mattila, T. Li, J. Liu, X.W. Li, M.Y. Kivilahti, J.K. |
| Copyright Year | 2009 |
| Description | Author affiliation: Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, China (Chen, H.T.; Li, M.Y.) || Laboratory of materials science, Helsinki University of Technology, P.O. Box 6200, 02015, Finland (Liu, X.W.) || Laboratory of Electronics Production Technology, Helsinki University of Technology, P. O. Box 3000, 02015, Finland (Mattila, T.; Li, J.; Kivilahti, J.K.) |
| Abstract | The failure mechanism of lead-free solder interconnections under thermal cycling has been studied by cross-polarized light microscopy, scanning electronic microscopy (SEM), and nanoindentation test. From the results of finite element modeling (FEM), it was found that the critical solder interconnection was located at the chip corner, and the stress was concentrated at the outer neck region beneath the ball grid arrays (BGA) component. The FEM results were in good agreement with the experimental observation. Two failure modes of the interconnections were identified: one is the intergranular or transgranular cracking through many small equiaxed recrystallized grains and the other is the transgranular cracking in few large irregularly shaped recrystallized grains. The results show that the localized recrystallization makes the Ag3Sn intermetallic compounds (IMC) coalesce and distribute sparsely, which leads to the degradation of the recrystallized microstructure and easy propagation of the cracks. |
| Starting Page | 562 |
| Ending Page | 568 |
| File Size | 2154228 |
| Page Count | 7 |
| File Format | |
| ISBN | 9781424446582 |
| DOI | 10.1109/ICEPT.2009.5270688 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-08-10 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Environmentally friendly manufacturing techniques Lead Scanning electron microscopy Failure analysis Numerical analysis Electronic equipment testing Finite element methods Thermal stresses Neck Electronics packaging |
| Content Type | Text |
| Resource Type | Article |
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