Effect of TiO2 nanoparticle addition and cooling rate on microstructure and mechanical properties of novel Sn1.5Sb0.7Cu solders

  • C. H. Huang
  • Chin-Hsin Chen
  • S. Y. Chang
  • L. C. TsaoEmail author
  • R. S. Chen


The effects of TiO2 nanoparticles and cooling rate on the microstructure and mechanical properties of Sn1.5Sb0.7Cu alloy were investigated. A higher cooling rate and TiO2 nanoparticles refined the primary β-Sn dendrites, Cu6Sn5 and SbSn phase. Especially, the microstructure of the Sn1.5Sb0.7Cu composite solders under the rapid-cooled condition exhibited fine dot-like Cu6Sn5 in the eutectic regions. The improvement in strength was mostly attributed to (1) refinement of the β-Sn grain size; (2) the Orowan strengthening effect; (3) CTE mismatch between reinforcement second phase particles (Cu6Sn5 and TiO2) and the matrix; and (4) the load-bearing effect. However, the total elongation of the composite solders was observed to decrease because of micro-voids both at and along the Cu6Sn5 grain boundary regions. The fracture surfaces of all Sn1.5Sb0.7Cu composite solder were confirmed to exhibit the ductile fracture mode.


TiO2 Nanoparticles Composite Solder SAC105 Solder Cu6Sn5 Phase Orowan Strengthen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors acknowledge the financial support of this work from the Ministry of Science and Technology, Taiwan, under Project No. MOST 103-2221-E-020-014. SEM was performed by the Precision Instrument Center of National Pingtung University of Science and Technology, Taiwan.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • C. H. Huang
    • 1
  • Chin-Hsin Chen
    • 2
  • S. Y. Chang
    • 3
  • L. C. Tsao
    • 2
    Email author
  • R. S. Chen
    • 1
  1. 1.Department of Engineering ScienceNational Cheng Kung UniversityTainan CityTaiwan
  2. 2.Institute of Materials EngineeringNational Pingtung University of Science and TechnologyNeipuTaiwan
  3. 3.Department of Mechanical EngineeringNational Yunlin University of Science and TechnologyTouliuTaiwan

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