Thermal Analysis of the Sn-Ag-Cu-In Solder Alloy

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Authors

SOPOUŠEK Jiří PALCUT Marian HODÚLOVÁ Erika JANOVEC Josef

Year of publication 2010
Type Article in Periodical
Magazine / Source JOURNAL OF ELECTRONIC MATERIALS
MU Faculty or unit

Faculty of Science

Citation
Web Thermal Analysis of the Sn-Ag-Cu-In Solder Alloy
Doi http://dx.doi.org/10.1007/s11664-009-1070-2
Field Physical chemistry and theoretical chemistry
Keywords Lead-free soldering; solidification; CALPHAD; DSC simulation
Description The tin-based alloy Sn-1.5Ag-0.7Cu-9.5In (composition in wt.%) is a potential candidate for lead-free soldering at temperatures close to 200A degrees C due to the significant amount of indium. Samples of Sn-1.5Ag-0.7Cu-9.5In were prepared by controlled melting of the pure elements, followed by quenching to room temperature. The samples were analyzed by scanning electron microscopy/energy-dispersive x-ray spectroscopy (SEM/EDS) and electron backscatter diffraction. The solidified melt consisted of four different phases. Solidification behavior was monitored by heat-flux differential scanning calorimetry (DSC). The phase equilibrium has been further investigated by thermodynamic calculations. The observed phase compositions as well as DSC signals are reasonably explained using the calculation of phase diagrams (CALPHAD) approach.
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