Microstructure coarsening during static annealing of 60Sn40Pb solder joints: I stereology |
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Authors: | Kang Jung Hans Conrad |
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Institution: | (1) Materials Science and Engineering Department, North Carolina State University, 27695-7907 Raleigh, NC |
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Abstract: | The phase size distributions (PSDs) of the Sn, Pb, and the combined Pb and Sn phases, and the shape factor δ were determined
for as-reflowed 60Sn40Pb solder joints and following their annealing at 50°C to 150°C. The PSDs in all cases had a positive
skew which was approximated by a log-normal function. The PSDs were time invariant and were in accord with the Bitti and Nunzio
model for phase coarsening. The shape factor, δ, decreased with the mean of the combined Pb and Sn phase size, and with temperature.
Whether or not δ affects the PSDs is not clear. |
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Keywords: | Solder joints phase size distribution positive skew log-normal function time invariant shape factor |
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