Microstructural stability of Sn-1Ag-0.5Cu-xAl (x = 1, 1.5, and 2 wt.%) solder alloys and the effects of high-temperature aging on their mechanical properties

► Addition of Al in the range of 1 wt.% to 2 wt.% to SAC105 alloy was investigated. ► The addition of Al strengthens the alloy. ► The addition of Al does not enhance resistance to aging.