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Effects of Grain Orientation on Cu6Sn5 Growth Behavior in Cu6Sn5-Reinforced Composite Solder Joints During Electromigration

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Abstract

Electromigration is a major reliability problem in composite solder joints. Due to the anisotropy of the β-Sn crystal structure, the Sn grain orientations present in the solder matrix dominate the principal failure mechanism in solder joints under electric current stressing. In this work, the Cu6Sn5 growth behavior in Cu6Sn5-reinforced composite solder joints with three different Sn grain orientations was investigated at current density of 104 A/cm2 at room temperature. Micron-sized Cu particles were added to Sn-3.5Ag solder at 2% volume fraction using an in situ method. After current stressing for 528 h, the polarity effect in the composite solder joint was greatest for an angle (θ) between the c-axis and electron flow direction of 30°, resulting in higher growth rate of Cu6Sn5 in the solder matrix compared with composite solder joints with θ of 60° or 90°. There were no noticeable changes in the composite solder joint with θ of 90°. The growth behavior of Cu6Sn5, Cu atomic motion, and Cu diffusivity in the composite solder joints with different Sn grain orientations were analyzed in detail.

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Acknowledgements

The authors acknowledge support of this work by the National Natural Science Foundation of China (No. 51401006), Beijing Natural Science Foundation (Nos. 2162005, 2172006, and 2172009), Beijing Nova Program (Z161100004916155), and Science and Technology Project of Beijing Municipal Education Commission (KM201710005003).

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Authors and Affiliations

  1. College of Material Science and Engineering, Beijing University of Technology, Beijing, 100124, China

    Jing Han, Yan Wang, Shihai Tan & Fu Guo

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  1. Jing Han
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  2. Yan Wang
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  3. Shihai Tan
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  4. Fu Guo
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Correspondence to Jing Han or Fu Guo.

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Han, J., Wang, Y., Tan, S. et al. Effects of Grain Orientation on Cu6Sn5 Growth Behavior in Cu6Sn5-Reinforced Composite Solder Joints During Electromigration. J. Electron. Mater. 47, 1705–1712 (2018). https://doi.org/10.1007/s11664-017-5898-6

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  • DOI: https://doi.org/10.1007/s11664-017-5898-6

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