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Effects of Trace Amounts of Rare Earth Additions on Microstructure and Properties of Sn-Bi-Based Solder Alloy

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Abstract

The effect of trace amounts of rare earth additions on the microstructure and properties were studied for the Sn-58Bi and Sn-58Bi-Ag solder alloys. At the same time, the intermetallic compounds (IMCs) in the solder alloys and intermetallic layer (IML) thickness at the solder/Cu substrate interface were investigated, both as-reflowed and after high-temperature aging. The results indicate that adding trace amounts of rare earth (RE) elements has little influence on the melting temperature and microhardness of the solders investigated, but adding RE elements improves the wettability and shear strength of the Sn-58Bi and Sn-58Bi-Ag solder alloys. In addition, it was found that the addition of RE elements not only refines the microstructure and size of the IMC particles, but also decreases the IML thickness and shear strength of the Sn-58Bi solder joint after high-temperature aging. Adding trace amounts of RE elements is superior to adding trace amounts of Ag for improving the properties of the Sn-58Bi solder. The reason may be related to the modification of the microstructure of the solder alloys due to the addition of trace amounts of RE elements.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Technology, l00 Ping Le Yuan, Chaoyang District, Beijing, 100124, P.R. China

    Wenxing Dong, Yaowu Shi, Zhidong Xia, Yongping Lei & Fu Guo

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  1. Wenxing Dong
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  2. Yaowu Shi
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  3. Zhidong Xia
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  4. Yongping Lei
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  5. Fu Guo
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Correspondence to Wenxing Dong.

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Dong, W., Shi, Y., Xia, Z. et al. Effects of Trace Amounts of Rare Earth Additions on Microstructure and Properties of Sn-Bi-Based Solder Alloy. J. Electron. Mater. 37, 982–991 (2008). https://doi.org/10.1007/s11664-008-0458-8

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  • DOI: https://doi.org/10.1007/s11664-008-0458-8

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