Figure 15

Shear fracture morphology of solder joints at different current stressing time: (a₁) Sn58Bi/Cu (288 h); (a₂) Top view of micro area A; (b₁) Sn58Bi-0.5CeO₂/Cu (288 h); (b₂) Top view of micro area B; (c₁) Sn58Bi/Cu (480 h); (c₂) Top view of micro area C; (d₁) Sn58Bi-0.5CeO₂/Cu (480 h); (d₂) Top view of micro area D.