Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 17, pp 14519–14527 | Cite as

Thermal aging effects on microstructure, elastic property and damping characteristic of a eutectic Sn–3.5Ag solder

  • Asit Kumar GainEmail author
  • Liangchi Zhang


The present work describes the microstructural changes and their impacts on the electrical resistivity, elastic modulus and damping property of a eutectic Sn–3.5wt% Ag solder material when exposed to high temperature. A detail microstructural study was conducted through the scanning electron microscopy with energy-dispersive spectroscopy analysis and electron backscattered diffraction technique. In as-cast eutectic Sn–Ag solder alloy, sub-micrometer size Ag3Sn intermetallic compound (IMC) particles and bamboo-like dendritic structure with a dimension of length 20–30 µm and width 3–5 µm formed during solidification. However, after thermal aging treatment at 150 °C for 60 days, the fine Ag3Sn IMC particles and β-Sn grain appeared with coarse microstructure with the formation of twinning having the <100> twin axis and 60° rotation. As a result, microstructure and Sn-crystal orientation of Sn–Ag solder greatly impact on its overall properties and turned inferior. From material properties evaluation, it was confirmed that the electrical resistivity, elastic and shear moduli values were significantly reduced with aging time. Consequently, the values of damping capacity improved due to the reduction of moduli.



The present work is supported by UNSW, Australia (Project No. RG124326). Authors are grateful to Mr. Tit Wah Chan, Physics and Materials Science Department, CityU, for assisting the damping capacity test. We would also like to thank Dr. M. Z. Quadir, Electron Microscopic Unit, UNSW, for helping the EBSD analysis.


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

Authors and Affiliations

  1. 1.Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing EngineeringUniversity of New South WalesSydneyAustralia

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