Abstract
The nucleation kinetics of the η-phase (Cu6Sn5) intermetallic compound were investigated by hot dipping copper coupons in molten tin for 1 and 2 sec, at temperatures varying from 240°C to 300°C. In the scanning electron microscope (SEM), the Cu6Sn5 phase appears as small, rounded bumps of varying sizes, jutting out from the surface of the copper. The experimentally determined nucleation curves show the typical inverse C type behavior with a maximum nucleation rate occurring at an intermediate temperature. The role of surface finish on nucleation rate was also studied. Experimentally determined “effective nucleation rate” per unit area is presented and compared with theoretical predictions over the temperature range investigated. Relevant nucleation models and nucleation energetic parameters are also discussed.
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