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Phase selection in supercooled Cu–Nb alloys

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Abstract

Electromagnetic levitation was used to determine Cu–Nb phase diagram and to study supercooling effects on solidification characteristics of the alloys containing 5–70 wt% Nb. The Cu–Nb stable phase diagram was found to exhibit near-flat liquidus with a peritectic reaction at 1093 °C. Melt separation was found only for specimens containing approximately 20 wt% Nb. The results indicate that melt separation in the alloy requires supercooling exceeding 230 K combined with high cooling rates during solidification. Some specimens quenched from the solid + liquid zone on a copper chill also show evidence of melt separation which is attributed to minor oxygen impurities. Nb-rich liquid which nucleates below the T0 curve solidifies as a metastable Nb-bcc lattice containing only 67 wt% Nb as compared to 96 wt% of the regular Nb dendrites.

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Authors and Affiliations

  1. Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva, Israel

    A. Munitz & A. Venkert

  2. Materials Science and Engineering, Technion, Technion City, Haifa, Israel

    M. Bamberger

  3. Materials Science and Engineering, Ben-Gurion University, Beer-Sheva, Israel

    P. Landau

  4. College of Engineering, University of California, Riverside, CA, 92521, USA

    R. Abbaschian

Authors
  1. A. Munitz
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  2. M. Bamberger
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  3. A. Venkert
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  4. P. Landau
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  5. R. Abbaschian
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Correspondence to A. Munitz.

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Munitz, A., Bamberger, M., Venkert, A. et al. Phase selection in supercooled Cu–Nb alloys. J Mater Sci 44, 64–73 (2009). https://doi.org/10.1007/s10853-008-3115-y

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  • DOI: https://doi.org/10.1007/s10853-008-3115-y

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