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The Sn-3.5Ag and Sn-4.0Ag-0.5Cu solders on electroless Ni-immersion Au metallization exhibited different interfacial morphology after high temperature storage (HTS) testing at 150degC. Ni3Sn4 intermetallic compounds (IMCs) were found in the Sn-Ag system, while in the Sn-Ag-Cu system, spalling grains of (Cu,Ni)6Sn5 IMC were observed after long aging, along with a thick (Ni,Cu)3Sn4 IMC layer which adheres...
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