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Indexed by:会议论文

Date of Publication:2010-01-01

Included Journals:EI、CPCI-S、Scopus

Page Number:293-298

Abstract:The interfacial reactions between (001) Ni single crystal and high-Sn solders were compared with those of polycrystalline Ni. The morphology of interfacial intermetallic compound (IMC) grains formed between (001) Ni single crystal and high-Sn solders (pure Sn, Sn-0.7Cu, Sn-0.7Cu-0.1Ni, Sn-1.5Cu and Sn-1.5Cu-0.1Ni, all in wt. %) at 250 degrees C and 300 degrees C for various durations was investigated. Regular arrangement of interfacial IMC grains aligning along some preferred directions formed on (001) Ni single crystal in Sn-0.7Cu-0.1Ni, Sn-1.5Cu and Sn-1.5Cu-0.1Ni solders, while in pure Sn and Sn-0.7Cu solders, the interfacial IMC grains formed irregularly on (001) Ni single crystal. On polycrystalline Ni, no regular arrangement of the interfacial IMC grains was observed in the five solders. The dramatic morphological change of the interfacial IMC and its regular arrangement on (001) Ni single crystal were explained in terms of (1) the crystallographic orientation relationship between the interfacial IMC and the substrate and (2) the solubility limit of Cu in molten solders based on the Cu-Sn-Ni phase diagram. The morphological change of (Cu, Ni)(6)Sn-5 also indicated that at the nucleation stage the Cu6Sn5 formed prior to the Ni3Sn4 in Sn-0.7Cu-0.1Ni/(001)Ni couple.