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Microstructural features and tensile properties of Sn-3.0Ag-0.5Cu solder joints on copper with various aging time at 150degC were examined. The solder inner and solder/Cu interface were analyzed by SEM to identify the fracture location, morphology and compositions. The study has showed, the tensile fracture strength of the solder joints decreases with the increased aging time, and the crack initiates...