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Sn-Ag-Cu solder alloys have been widely used as lead-free solders following the enactment of the 2007 RoHS Directive. Recently, the content of Ag has been demanded to decrease in the solders for wave soldering process as the cost of Ag has already become very expensive. On the other hand, it was considered that the mechanical strength of the solder tends to be not enough as the amount of Ag decreases...
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