Influence of Cu addition on intermetallic compound formation and microstructure of Sn-3Ag-1.5Sb-xCu solder joints

H. T. Lee, W. Y. Huang, Y. F. Chen

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

This study investigates the influence of 0-1-5 wt-%Cu addition on the microstructure and the intermetallic compound (IMC) formation of the as soldered Sn-3Ag-1.5Sb-xCu (wt-%) solders and following thermal storage at 150°C for 0, 25, 200 and 600 h, with the intention of identifying the optimum Cu addition for industrial applications. The experimental results show that the melting point of Sn-3Ag-1.5Sb-xCu solder decreases with Cu addition. For Cu additions of 1-0 wt-% or higher, an IMC of Cu6Sn5 particles is dispersed throughout the matrix, resulting in a dispersion strengthening effect, and its size increases with the levels of Cu addition increasing. The coarsened long strip like Cu6Sn5 with a length of more than 100 μm growing from the upper interface of IMC layer into the solder matrix is observed in the solder with 1-5 wt-%Cu addition after thermal storage. Cu 6Sn5 grains in the IMC layer develop the ripening grains with a more hexagonal or polygonal shape and smooth edged flat surfaces instead of scallop shape. Additionally, the microhardness of each solder increases with Cu addition and decreases with increasing time of thermal storage at 150°C.

原文English
頁(從 - 到)781-790
頁數10
期刊Science and Technology of Welding and Joining
13
發行號8
DOIs
出版狀態Published - 2008 十一月 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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