Significantly Improved Mechanical Properties of Bi- Sn Solder Alloys by Ag- Doping |
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Authors: | M. Mccormack H. S. Chen G. W. Kammlott S. Jin |
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Affiliation: | (1) Bell Laboratories, Lucent Technologies, 07974 Murray Hill, NJ;(2) Present address: Emerson Company, 43201 Columbus, OH |
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Abstract: | The addition of small amounts of Ag (less than ~;0.5 wt. %) is found to significantly improve the ductility of the binary Bi-Sn eutectic solder. The ductility improvement, more than a threefold increase in tensile elongation, is observed even at a relatively high strain rate (0.01 s-1). As the Bi-Sn binary eutectic alloy tends to fail catastrophically by brittle fracture at high strain rates, the reduced strain-rate sensitivity in the Ag-containing alloy is beneficial for improving solder reliability on sudden impacting as might be encountered during device assembly, shipping, or thermal shock/cycling. The observed increase in alloy ductility by Ag additions is attributed to a substantial refinement of the solidification microstructure. |
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Keywords: | Lead-free mechanical properties microstructure solder |
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