Abstract
Sn-0.7Cu-xNi composite solder has been fabricated via mechanical mixing of different weight percentages of Ni particles with Sn-0.7Cu solder paste, and the effect of the Ni concentration on the microstructure, wettability, and tensile properties of Cu/Sn-0.7Cu-xNi/Cu solder joints investigated. The results show that refined dot-shaped particles of intermetallic compounds (IMCs) are uniformly dispersed in a primary β-Sn matrix in the Cu/Sn-0.7Cu-(0.05–0.1)Ni/Cu solder joints. The interfacial IMC layer thickness increased slightly when adding Ni content to 0.05 wt.%, then rapidly when further increasing the Ni concentration to 0.4 wt.%. Excellent wettability with bright appearance was obtained for the Sn-0.7Cu-0.05Ni solder due to diminished interfacial tension. The tensile properties improved after adding Ni content to 0.05 wt.% due to the presence of the refined dot-like IMC particles, in agreement with theoretical predictions based on the combination of dispersion and grain-refinement strengthening mechanisms. Refined microstructure and enhanced mechanical properties were obtained for the Cu/Sn-0.7Cu-0.05Ni/Cu solder joint.
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Acknowledgements
This research was financially supported by the National Natural Science Foundation of China (Grant No. 51401037), Science and Technology Program of Jiangsu Province of China (Grant No. BK20141228), Science and Technology Program of Suzhou (Grant Nos. SYG201421, SYG201348, and SYG201251), Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant Nos. 14KJB430001 and 13KJB430001), Scientific Research Project of Changshu Institute of Technology (JXK2014003), and Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control (Grant No. JSKLEDC201301).
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Yang, L., Ge, J., Zhang, Y. et al. Investigation on the Microstructure, Interfacial IMC Layer, and Mechanical Properties of Cu/Sn-0.7Cu-xNi/Cu Solder Joints. J. Electron. Mater. 45, 3766–3775 (2016). https://doi.org/10.1007/s11664-016-4509-2
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DOI: https://doi.org/10.1007/s11664-016-4509-2