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Phase transformations in the Zr-rich part of the Zr-Fe system resulting from heat treatment and plastic deformation

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Abstract

Phases and phase transformations occurring in the Zr-rich part of the Zr-Fe system during heat treatment and plastic deformation were identified by means of Mössbauer spectroscopy and X-ray diffraction analysis. Low iron alloys (<0.02 wt pct Fe) undergo a complete β → αm reaction (martensitic type) on quenching. For higher iron content alloys (0.02 to 0.25 wt pct Fe) the β → αm ransformation is accompanied by formation of metastable intermediate phase designated θ. The iron concentration of θ-phase is much higher than that of αZr(Fe). During the aging process, at the outset of the equilibrium state, the θ-phase disappears by transforming to Zr2Fe intermetallic. Cold rolling of quenched(α m + θ) specimens leads to formation of the athermal ω-phase. Presence of the intermediate θ-phase seems to be a prerequisite for the athermal ω-phase formation. A decrease in specific volume (ΔVθ < 0) accompanying the α→ θ transition was suggested as a possible mechanism of the α →θ → ω transformation. Mössbauer parameters for the thermal and athermal ω -phase were determined. Presence of θ and athermal ω -phases were identified by Mössbauer spectroscopy only, being undetectable by X-ray diffraction, because of their minute quantities. Solubility of iron in the α Zr(Fe) solid solution was determined in the range of temperatures 713 to 943 K (440 to 670 °C).

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Authors and Affiliations

  1. Department of Materials Engineering, Technion, Israel Institute of Technology, 32000, Haifa, Israel

    B. Z. Weiss (Professor)

  2. Department of Materials Engineering, Technion, Israel Institute of Technology, 32000, Haifa, Israel

    M. Bamberger (Senior Lecturer) & M. M. Stupel (Visiting Senior Lecturer)

Authors
  1. B. Z. Weiss
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  2. M. Bamberger
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  3. M. M. Stupel
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on leave of absence with IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598

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Weiss, B.Z., Bamberger, M. & Stupel, M.M. Phase transformations in the Zr-rich part of the Zr-Fe system resulting from heat treatment and plastic deformation. Metall Trans A 18, 27–33 (1987). https://doi.org/10.1007/BF02646218

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  • DOI: https://doi.org/10.1007/BF02646218

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