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Determination of the eutectic structure in the Ag-Cu-Sn system

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Abstract

A search for lead-free solder alloys has produced an alloy in the Ag-Cu-Sn system. This alloy is of great importance to the soldering community, and proper determination of structure, processing, and properties will be significant. In the present study, tin-rich alloys were fabricated to better determine the much-debated morphology of secondary and tertiary phases in the eutectic structure. A deep etching procedure was used to reveal the growth structure of monovariant “eutectic-like” reactions as well as the ternary eutectic reaction. Scanning electron microscopy (SEM) and electron-probe microanalysis (EPMA) verified the three-phase nature of the eutectic. The rodlike eutectic structure in this system is consistent with the more simplified volume fraction and surface energy models that have been presented in the literature.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Lehigh University, 18015, Bethlehem, PA

    Daniel Lewis, Michael Notis & Adam Scotch

  2. Manchester Materials Science Centre, University of Manchester and University of Manchester Institute of Science and Technology, M1 7HS, Manchester, United Kingdom

    Sarah Allen

Authors
  1. Daniel Lewis
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  2. Sarah Allen
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  3. Michael Notis
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  4. Adam Scotch
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Lewis, D., Allen, S., Notis, M. et al. Determination of the eutectic structure in the Ag-Cu-Sn system. J. Electron. Mater. 31, 161–167 (2002). https://doi.org/10.1007/s11664-002-0163-y

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  • DOI: https://doi.org/10.1007/s11664-002-0163-y

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