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Phase separation mechanism and property changes in In–41Sn–9Zn under the current stressing

  • Jingze WangEmail author
  • Dongxin Mao
  • Lei Shi
  • Hongtao Chen
  • Feng Li
  • Ruihan Xia
  • Manning Li
Article
  • 9 Downloads

Abstract

Phase separation mechanism and property changes in In–41Sn–9Zn solder was investigated with the current density of direct current 1.0 × 103 A/cm2. The results indicated that the phase separation was affected by the combination of electron wind force and back stress. The different degree of lattice distortion between different regions was one of the causes of the back stress. In the alloy, In-rich β phases and Sn-rich γ phases were segregated at the cathode side and anode side respectively, while Zn atoms didn’t migrate to the two poles significantly. Sn was the main diffusing atom \(\left( {\left| {{\text{Z}}_{\text{Sn}}^{*} } \right| > \,\left| {{\text{Z}}_{\text{In}}^{*} } \right|} \right)\) in the alloy, so the volume change rates at the anode side was about four times higher than that of the cathode side. After 72 h electromigration, the cathode–anode difference in micro-hardness, melting point, thermal enthalpy and melting interval was about 0.3 Mpa, 2 °C, 4.18 J/g, and 0.9 °C, respectively.

Notes

Acknowledgements

The authors would like to acknowledge the financial support provided by the Natural Science Foundation of Heilongjiang Province (Grant Number E201447) and Science and technology research project of Education Department of Heilongjiang Province (Grant Number 11521047). The authors would like to thank Professor Chen and Professor Liu at the center for material analysis and testing, who provided the experimental help.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringHarbin University of Science and TechnologyHarbinChina
  2. 2.School of Materials Science and EngineeringChina University of Mining & Technology, BeijingBeijingChina

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