Influence of Phase Inhomogeneity on Electromigration Behavior in Cu/Sn-58Bi/Cu Solder Joint

  • Hongbo QinEmail author
  • Xinghe Luan
  • Wu Yue


Owing to the limitations of experimental characterization, a combination of numerical methods based on image-based microstructure reconstruction, microstructure simulation, and finite element analysis was utilized to investigate the influence of phase inhomogeneity on the electromigration behavior in microscale Cu/Sn-58Bi/Cu solder joints. The current crowding effect induced by phase inhomogeneity was revealed, and the maximum current density was two orders of magnitude greater than the minimum current density in a microstructure under current stressing. The current density carried by Sn-rich phases was much larger than that carried by Bi-rich phases, and the migration and diffusion behavior of Bi atoms in the Sn-rich phase were analyzed. Results showed that the Bi atomic flux caused by a Joule heat-induced temperature gradient was limited in this study.


Phase inhomogeneity electromigration eutectic Sn-58Bi solder finite element analysis 


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This research was supported by the National Natural Science Foundation of China (NSFC, Nos. 51505095 and 51565024), Natural Science Foundation of Guangxi (No. 2018GXNSFAA281222), and Science and Technology Project of Guangxi (No. 2018AD19080).

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.School of Mechanical and Electronic EngineeringGuilin University of Electronic TechnologyGuilinChina
  2. 2.School of Materials EngineeringLanzhou Institute of TechnologyLanzhouChina

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