“…The intermetallic compounds, which form between the SAC and copper base are similar to those found in the Sn-Pb/Cu connections. Also some studies are reported on intermetallic phases found in the Sn-Cu solder joints [3] and Sn-Ag [1,4,5]. Besides, various additions to the Sn-Ag alloy such as Ni, Cu, Al, Zn, Co, Sb, P and Au were studied in [6] and the interface layer is similar to that found in SnZn with additions.…”