Metastable eutectic in Pb-free joints between Sn-3.5Ag and Ni-based substrates
Metastable eutectic in Pb-free joints between Sn-3.5Ag and Ni-based substrates
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Sn-3.5Ag 和镍基基材之间无铅接头中的亚稳态共晶
DOI:
10.1016/j.matlet.2015.02.073
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发表时间:
2015
影响因子:
3
通讯作者:
Belyakov S
中科院分区:
文献类型:
--
作者:
Belyakov S
Microstructure development in solder joints between Sn–3.5Ag and Ni-based substrates has been widely reported. However, in the present study we illustrate a new phenomenon: that during soldering of Sn–3.5Ag to Ni or ENIG (electroless nickel, immersion gold), the bulk solder solidifies to contain a metastable eutectic consisting of βSn+Ag3Sn+NiSn4instead of the βSn+Ag3Sn+Ni3Sn4, expected of equilibrium solidification. It is shown that metastable NiSn4coarsens and then decomposes into Ni3Sn4and βSn during aging at 150 and 200 °C and that coarsened NiSn4particles deteriorate impact shear properties.
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1976
期刊:
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作者:
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发表时间:
2008
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