Abstract
Studying Al particles reinforced composite lead-free solder by experiments of constant temperature thermal stress aging treatment. Scanning electron microscope was used to observe the micro-structure of composite solder. The results show that composite lead-free solder after constant 125°C aging treatment for 24 hours, Al particles has two types of morphologies: one is small amount of solid solution,another type is a large number of aluminum particles structure.The existence of Al particles slowed down the coarsening rate of the Bi Phase grain, and obtained uniform refined the Bi Phase grain.
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