Abstract
The present study investigates the changes in microstructures and their effects on electrical resistivity, moduli, hardness and damping properties in an environmental-friendly eutectic Sn–3.0Ag–0.5Cu (wt%) solder alloy when exposed to harsh service environments. A thorough microstructural investigation was conducted by scanning electron microscopy with diffraction analysis and transmission electron microscopy. In the as-received Sn–Ag–Cu solder alloy, very-fine needle-shaped Ag3Sn and Cu6Sn5 intermetallic compound (IMC) particles are found to be uniformly dispersed in the eutectic colony. However, after exposing at harsh service environments (e.g., aging temperature at 150 °C for various aging time) these IMC particles were appeared with coarse structure. This coarsening nature of IMC particles degraded the mechanical properties of electronic interconnections. This was confirmed by measuring a range of electrical and mechanical properties that included electrical resistivity, Young’s moduli, shear moduli and microhardness. A comparison between the as-received and isothermal aging solder alloy shows that the electrical resistivity of as-received and 60 days isothermal aged alloys was about 12.5 and 10.0 μΩ cm, respectively. Further, the degradation in shear moduli and hardness was about 27.3 and 25.5%, respectively. However the isothermal aged solder alloy displayed high damping property as compare to the as-received alloy.
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Acknowledgements
The authors acknowledge the financial support provided by The University of New South Wales (UNSW) through the project InfoEd Ref: RG124326. The authors would also like to thank Mr. Tit Wah Chan, Department of Physics and Materials Science, City University of Hong Kong, for helping in evaluating the damping properties.
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Gain, A.K., Zhang, L. Effect of isothermal aging on microstructure, electrical resistivity and damping properties of Sn–Ag–Cu solder. J Mater Sci: Mater Electron 28, 9363–9370 (2017). https://doi.org/10.1007/s10854-017-6675-2
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DOI: https://doi.org/10.1007/s10854-017-6675-2