کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1626236 | 1516438 | 2007 | 6 صفحه PDF | دانلود رایگان |

The solder joints between Cu/Sn-40Pb/Cu lead solder and Cu/Sn-9Zn/Cu and Cu/Sn-8Zn-3Bi/Cu lead-free solders were studied. The study focuses upon the formation of interface intermetallic (IMC), adhesive strength of the joints and the fracture morphology of the as-soldered soldered joints. For Sn-40Pb, Cu6Sn5 IMC was formed. For Sn-9Zn and Sn-8Zn-3Bi solders, two layers were detected. For Sn-9Zn solder, the first layer next to the solder is a Cu6Sn5 phase with some Zn dissolve in it. The second layer next to the Cu substrate is γ-Cu5Zn8 phase. While for Sn-8Zn-3Bi solder, the first layer is mixture of Cu-Sn + Cu-Zn phase and the second layer is γ-Cu5Zn8 phase. Sn-8Zn-3Bi solder has the highest strength followed by Sn-40Pb and Sn-9Zn, respectively, and their strength increases with crosshead speed. The fracture of the solder joints occurs in the elastic strain region or after a small plastic strain with Sn-40Pb solder has the highest strain followed by Sn-8Zn-3Bi and Sn-9Zn solders. The fracture surface of the three solders investigated showed ductile dimple appearance. The addition of 3% Bi increases the tensile strength and ductility of the Sn-Zn-Bi system.
Journal: Journal of Alloys and Compounds - Volume 436, Issues 1–2, 14 June 2007, Pages 112–117