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Thermal expansion and elastic properties of high gold-Tin Alloys

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Abstract

The Au-Sn eutectic alloy, composed of the ζ and δ phases, has been used for many years in the sealing of hermetic parts. Recently, it was shown that the ζ phase undergoes an ordering transformation to ζ′. Since this transformation may affect hermeticity, measurements of density, linear thermal expansion coefficient, elastic moduli, and Poisson’s ratio were made on ζ-phase, eutectic, and δ-phase specimens. Measurements were made over a temperature range that includes the ζ → ζ′ transformation. Abrupt changes in these thermophysical properties, near the phase transformation temperature, are noted for ζ and eutectic specimens but not for the δ specimen.

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Authors and Affiliations

  1. Sandia National Labo-ratories, 87185, Albuquerque, NM

    F. G. Yost (Technical Staff Member), M. M. Karnowsky (Technical Staff Member), W. D. Drotning (Technical Staff Member) & J. H. Gieske (Technical Staff Member)

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  1. F. G. Yost
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  2. M. M. Karnowsky
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  3. W. D. Drotning
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  4. J. H. Gieske
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Yost, F.G., Karnowsky, M.M., Drotning, W.D. et al. Thermal expansion and elastic properties of high gold-Tin Alloys. Metall Trans A 21, 1885–1889 (1990). https://doi.org/10.1007/BF02647236

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  • DOI: https://doi.org/10.1007/BF02647236

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