Influence of cooling conditions on microstructure and mechanical property of Sn-0.3Ag-0.7Cu lead-free solder

Prajak JATTAKUL; Tavee MADSA; Piyawan SUNASUAN; Niwat MOOKAM

doi:10.55713/jmmm.v31i2.1085

Authors

Prajak JATTAKUL Department of Industrial Engineering, School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520, Thailand https://orcid.org/0000-0002-3538-9680
Tavee MADSA Department of Industrial Engineering Technology, Faculty of Industry and Technology, Rajamangala University of Technology Rattanakosin Wang Klai Kangwon Campus, Prachuapkhirikhan 77110, Thailand
Piyawan SUNASUAN Department of Industrial Engineering Technology, Faculty of Industry and Technology, Rajamangala University of Technology Rattanakosin Wang Klai Kangwon Campus, Prachuapkhirikhan 77110, Thailand
Niwat MOOKAM Department of Industrial and Production Engineering, Faculty of Industry and Technology, Rajamangala University of Technology Rattanakosin Wang Klai Kangwon Campus, Prachuapkhirikhan 77110, Thailand

DOI:

https://doi.org/10.55713/jmmm.v31i2.1085

Keywords:

Sn-0.3Ag-0.7Cu solder, Cooling conditions, Microstructure, Mechanical property

Abstract

This research has investigated the influence of cooling conditions on the microstructure and mechanical properties i.e., tensile strength and microhardness of Sn-0.3Ag-0.7Cu lead-free solder. In the experiments, casting was performed at 300℃ with comparison between copper and stainless steel molds under slow and fast cooled conditions. X-ray diffractometer confirmed the presence of Cu₆Sn₅and Ag₃Sn phases in the solder matrix. Lead-free solder solidified under slow cooled conditions exhibited -Sn matrix with larger grain growth as compared to the fast cooled solder. The eutectic area of intermetallic compound (IMC) was found to increase with cooling rate. The tensile strength of slow cooled solder was greater than fast cooled solder for both molds. In addition, the microhardness of the solder was also influenced by cooling rate. The dimples size of facture surface was decreased by higher cooling rate. A greater eutectic area of the Cu₆Sn₅and Ag₃Sn phases of initial -Sn matrix lead to lower values of the mechanical property from fast cooled conditions.

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