Abstract
The interlayer reaction between Sn-3.0Ag-0.5Cu lead free solder and electrolytic coppers, those include different types of lattice defects analyzed by positron annihilation technique in advance, has been investigated. The copper sample, which has a higher concentration of vacancy clusters, has a higher growth rate of Cu3Sn layer formed on reaction diffusion with the solder, and only for the sample voids was observed in the layer.
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