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Journal of Materials Science

, Volume 53, Issue 12, pp 9287–9296 | Cite as

Microstructure evolution and mechanical reliability of Cu/Au–Sn/Cu joints during transient liquid phase bonding

  • J. Peng
  • H. S. Liu
  • H. B. Ma
  • X. M. Shi
  • R. C. Wang
Metals
  • 176 Downloads

Abstract

The microstructure evolution and mechanical reliability of Cu/Au–Sn/Cu sandwich joints during transient liquid phase (TLP) bonding were investigated in this study. The results show that the Au–Sn solder reacted with the Cu substrate to form Au and Au6.6Cu9.6Sn3.8. During the TLP bonding process, (Au, Cu)5Sn was formed first, following which new α(Au) and Au6.6Cu9.6Sn3.8 phases appeared, to finally form a combination of α’(Au), α(Au), and Au6.6Cu9.6Sn3.8 phases when the Au–Sn solder is exhausted. The volume contraction associated with the consumption of the Au–Sn solder results in pore formation and subsequent shear strength deterioration in the Cu/Au–Sn/Cu joint. The presence of the Au6.6Cu9.6Sn3.8 phase also slightly reduced the shear strength of the joint. However, the overall shear strength of the TLP-bonded joint consisting of α’(Au)/α(Au)/Au6.6Cu9.6Sn3.8 phases without pores was approximately 50 MPa. The TLP-bonded joints possess excellent mechanical reliability, with shear strength of 28 MPa even at 350 °C, a temperature that is 70 °C higher than the melting point of the Au–Sn solder. Moreover, the shear strength of the TLP-bonded joint remains stable at 50 MPa even after exposure to high temperatures such as 250 or 350 °C, for 400 h, and only slightly decreased after 400 thermal cycles.

Notes

Acknowledgements

Financial support from the National Science and Technology Major Project of the Ministry of Science and Technology of China (2017YFB0305700) was highly acknowledged.

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

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaPeople’s Republic of China
  2. 2.Beijing Nonferrous Metals and Rare Earth Research InstituteBeijingPeople’s Republic of China

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