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Microstructure and shear property of In-Sn-xAg solder joints fabricated by TLP bonding

  • Li YangEmail author
  • Yifeng Xiong
  • Yaocheng Zhang
  • Wei Jiang
  • Di Wei
Article
  • 19 Downloads

Abstract

Transient liquid phase (TLP) bonding was applied to prepare Cu/In-Sn-xAg/Cu (x = 20, 30, 40, 50, 60, 70 wt%) solder joints, and the effect of Ag particle content on joint microstructure, shear property and growth mechanism of intermetallic compound (IMC) was studied. The results indicated that the microstructure of solder joint consists of interfacial diffusion reaction zone and particle in situ reaction zone. The IMC in interfacial diffusion reaction zone is Cu3(In, Sn) phase and the IMCs in in situ reaction zone is composed of In-rich phase + Ag particle + ζ-Ag3In + Ag3(In, Sn). With the increasing Ag particle content, the thickness of IMC layer in diffusion reaction zone is decreased, the total amount of In-rich phase and Ag3(In, Sn) phase in in situ reaction zone is decreased, the quantity of Ag particles and ζ-Ag3In phase is grew. The AgIn2 phase is a stable IMC formed as a preferential reaction because it requires less Gibbs free energy than Sn-Ag phase, and it is transformed to ζ-Ag3In phase with increasing bonding time to 10 min. The void ratio of solder joints is decreased firstly and then increased with increasing Ag content. The shear strength of the joint is increased firstly and then decreased with increasing Ag particle content, and the maximum shear strength 22.2 MPa is obtained by Cu/In-Sn-50Ag/Cu solder joints. The shear fracture mechanism of solder joints is changed from ductile–brittle mixed fracture to brittle fracture.

Notes

Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant No. 51865006,) and Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 18KJA460001).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Li Yang
    • 1
    • 3
    Email author
  • Yifeng Xiong
    • 2
  • Yaocheng Zhang
    • 3
  • Wei Jiang
    • 2
  • Di Wei
    • 3
  1. 1.School of Mechanical EngineeringGuilin University of Aerospace TechnologyGuilinPeople’s Republic of China
  2. 2.School of Mechanical EngineeringSoochow UniversityJiangsuPeople’s Republic of China
  3. 3.School of Automatic EngineeringChangshu Institute of TechnologyJiangsuPeople’s Republic of China

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