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Electromigration-induced cracks in eutectic SnPb solder reaction couple at room temperature

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Abstract

Electromigration (EM) of 63Sn–37Pb solder reaction couple was studied under high current density of 5 × 103 A/cm2 at room temperature. There was non-uniform distribution of current density across the linear specimen, and the dissimilar interface of two different materials could trigger current crowding especially at the edge of the interface. Though the atoms/ions of Sn and Pb would migrate along the direction of electron flow pushed by electron wind force, the Sn atoms were observed to be the principal diffusion entities at room temperature. Depletion of mass at cathode side induced the tensile stress along parallel direction of the specimen cross-section, while the accumulation of mass at anode side induced the compressive stress along the perpendicular direction of the specimen cross-section. Crack initiation and propagation in both cathode and anode side was found to be strongly dependent on the current density distribution.

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Acknowledgments

The authors acknowledge the financial support of this work from the New Century Talent Support Program, Ministry of Education, and the Funding Project PHR (IHLB).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing, 100022, People’s Republic of China

    G. C. Xu, H. W. He & F. Guo

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  1. G. C. Xu
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  2. H. W. He
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  3. F. Guo
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Correspondence to G. C. Xu.

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Xu, G.C., He, H.W. & Guo, F. Electromigration-induced cracks in eutectic SnPb solder reaction couple at room temperature. J Mater Sci: Mater Electron 20, 276–282 (2009). https://doi.org/10.1007/s10854-008-9720-3

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  • DOI: https://doi.org/10.1007/s10854-008-9720-3

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