Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 23, pp 19901–19908 | Cite as

Effects of Co addition on shear strength and interfacial microstructure of Sn–Zn–(Co)/Ni joints

  • J. Y. Li
  • J. Peng
  • R. C. WangEmail author
  • Y. Feng
  • C. Q. Peng


Sn–9Zn solder alloyed with cobalt (0, 0.5, 3 wt%) was bonded to Ni pad at 250 °C for various durations, and the effects of Co on the microstructure evolution and the shear behavior of the Sn–Zn/Ni joints were investigated by microstructural observations and shear tests. The results reveal that Co improves the shear strength and the interfacial microstructure of the Sn–9Zn/Ni joints significantly. Co is not only a diffusion barrier that impedes Zn from gathering at the interfaces to form Ni5Zn21, but it reacts with Zn in the composite solders with 3 wt% Co adding to the Sn–9Zn solder. When preferential Ni5Zn21 is transformed into Ni2Sn2Zn at the Sn–Zn–Co/Ni interfaces, ductile ruptures occur as Ni2Sn2Zn has similar elastic modulus and connects firmly with the solder. Accordingly, the strength of the Sn–Zn–Co/Ni joints reaches the highest. Moreover, the shear strength of the Sn–Zn–3Co/Ni joints maintains above 35 MPa after 90 min soldering, on account of the Ni2Sn2Zn remaining uniform ripples and fracture surfaces appearing with homogeneous Ni2Sn2Zn dimples. Whereas, at the Sn–Zn/Ni joints, the thick Ni5Zn21 layer and pores intensify the stress concentration and lead to a lower strength. In general, the addition of Co refines the interfacial microstructure that the Sn–Zn–Co/Ni joints are uniformly stressed and achieve desirable strength.



This work was financially supported by Ministry of Science and Technology of China (2017YFB0305700).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • J. Y. Li
    • 1
  • J. Peng
    • 1
  • R. C. Wang
    • 1
    Email author
  • Y. Feng
    • 1
  • C. Q. Peng
    • 1
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina

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