• reactions of sn-4.0ag-0.5cu on cu and electroless ni substrate in premelting soldering process

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     early formation of cu6sn5 and (ni,cu)6sn5 during soldering was investigated. sn4.0ag0.5cu solder on cu and electroless ni-au substrate was quenched in ice water after the initial stage of melting, and the solder–substrate interface was analyzed by transmission electron microscopy and energy-dispersive x-ray spectroscopy. at the contacting point, cu3sn and cu6sn5 were found at the solder–cu substrate interface, while (ni,cu)6sn5 and ni2snp were identified at the solder–electroless ni interface. the contacting points were confirmed as the sites of heterogeneous nucleation. tem analysis suggested that the nucleation of both intermetallic compounds can be attributed to diffusion-induced crystallization. details of the early interfacial reactions are discussed.

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