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Contribution to the Zr-rich part of the Zn-Zr phase diagram

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Abstract

The reaction of zinc vapor with Zircaloy-4 and nuclear grade zirconium was investigated with various analytical techniques: optical metallography, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Based on the results, the Zr-rich part of the Zn-Zr phase diagram was revised. A eutectoid decomposition of (βZr) occurs at 718±6 °C with a composition of xZr=0.865; this temperature is lower than the previously accepted 750 °C eutectoid. The solubility of Zn in (αZr) was determined to be at x Zn=0.0236, a maximum at 725 °C. The intermetallic phase ZnZr2 was observed to occur in samples heat treated at 712 °C and 725 °C, but not in those heat treated at 700 °C and 775 °C.

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Authors and Affiliations

  1. Metallurgy Division, National Institute of Standards and Technology 100 Bureau Dr., Mailstop 8555, 20899-8555, Gaithersburg, MD

    Maureen E. Williams, William J. Boettinger & Ursula R. Kattner

Authors
  1. Maureen E. Williams
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  2. William J. Boettinger
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  3. Ursula R. Kattner
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Williams, M.E., Boettinger, W.J. & Kattner, U.R. Contribution to the Zr-rich part of the Zn-Zr phase diagram. J Phs Eqil and Diff 25, 355–363 (2004). https://doi.org/10.1007/s11669-004-0153-2

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  • DOI: https://doi.org/10.1007/s11669-004-0153-2

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