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The microstructure, the wettability and dissolution behavior of Sn0.8Ag0.5Cu2.0Bi0.05Ni (SACBN) and Sn3.0Ag0.5Cu (SAC305) lead-free solder alloys were comparatively investigated. The results show that the microstructure of SACBN solder alloy contains β-Sn and eutectic phase, and that the eutectic phase is made of β-Sn, well-ditributed needlelike Ag3Sn, granular (Cu, Ni)6Sn5 and minor granular Bi....
In this paper, the behavior of BGA solder joints microstructures was studied as a function of Ni doping in SAC solder. Three kinds of solder compositions were selected including Sn3.0Ag0.5Cu, Sn1.0Ag0.5Cu and Sn1.0Ag0.5Cu0.02Ni to value the influence the effect of Ni doping, OSP and Au/Ni pad was employed on the PCB side. Emphasis was placed on studying the effect of low level doping with Ni on the...
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