Effect of in addition on Sn-3.5Ag solder and joint with Cu substrate

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The effect of In addition on the binary eutectic Sn-3.5Ag (compositions are all in mass% unless specified otherwise) solder alloy was investigated. The phase equilibrium and the thermodynamic behaviors were examined up to an indium level of 11.5. The addition of about 9In lowered the liquidus temperature below 210 degreesC, and the microstructures of the solder and the morphology of secondary phases in the solder matrix changed accordingly. The secondary phases coarsened in aging at 150 degreesC up to 500 h. However, the coarsening had little effect on the hardness of the solder alloys. Though the surface tension between the solder and the vapor increased with an increase in In content, the wetting angle over the Cu substrate decreased. This was explained by the increased driving force for formation of the intermetallic compound (IMC) at the interface between the Sn-3.5Ag-In solder and the Cu substrate and thereby the decreased surface tension between the solder and the substrate.
Publisher
JAPAN INST METALS
Issue Date
2001
Language
English
Article Type
Article
Keywords

PB-FREE SOLDER; LEAD-FREE SOLDERS; MECHANICAL-PROPERTIES; SN-IN; ALLOYS; BI; SYSTEM; ZN; THERMODYNAMICS

Citation

MATERIALS TRANSACTIONS, v.42, no.5, pp.783 - 789

ISSN
1345-9678
URI
http://hdl.handle.net/10203/78948
Appears in Collection
MS-Journal Papers(저널논문)
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