Journal of Electronic Materials

, Volume 33, Issue 12, pp 1429–1439

Growth of Sn and intermetallic compounds in Sn-Ag-Cu solder

  • L. P. Lehman
  • S. N. Athavale
  • T. Z. Fullem
  • A. C. Giamis
  • R. K. Kinyanjui
  • M. Lowenstein
  • K. Mather
  • R. Patel
  • D. Rae
  • J. Wang
  • Y. Xing
  • L. Zavalij
  • P. Borgesen
  • E. J. Cotts
Special Issue Paper

DOI: 10.1007/s11664-004-0083-0

Cite this article as:
Lehman, L.P., Athavale, S.N., Fullem, T.Z. et al. Journal of Elec Materi (2004) 33: 1429. doi:10.1007/s11664-004-0083-0
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Abstract

The microstructure of the Sn-Ag-Cu solder is examined by optical microscopy and scanning electron microscopy (SEM) for various compositions near the ternary eutectic for different cooling rates from the solder melt. Focus is on the size and orientation of Sn grains as indicated by cross-polarized, light optical microscopy, and pole figures from x-ray diffraction. We find that both composition and cooling rate have strong influences on Sn grain size, with Sn grain size increasing an order of magnitude as Cu concentration increases from 0% to 1.1%. Cyclic growth twinning, with twinning angles near 60°, is observed in Sn-Ag-Cu alloys near the composition Sn-3.9Ag-0.6Cu.

Key words

Sn-Ag-Cu solder intermetallic compounds 

Copyright information

© TMS-The Minerals, Metals and Materials Society 2004

Authors and Affiliations

  • L. P. Lehman
    • 1
  • S. N. Athavale
    • 1
  • T. Z. Fullem
    • 1
  • A. C. Giamis
    • 1
  • R. K. Kinyanjui
    • 1
  • M. Lowenstein
    • 1
  • K. Mather
    • 1
  • R. Patel
    • 1
  • D. Rae
    • 1
  • J. Wang
    • 1
  • Y. Xing
    • 1
  • L. Zavalij
    • 1
  • P. Borgesen
    • 2
  • E. J. Cotts
    • 1
  1. 1.Department of Physics and the Materials Science ProgramBinghamton University, SUNYBinghamton
  2. 2.Universal Instruments CorporationBinghamton

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