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Journal of Materials Science

, Volume 44, Issue 1, pp 64–73 | Cite as

Phase selection in supercooled Cu–Nb alloys

  • A. MunitzEmail author
  • M. Bamberger
  • A. Venkert
  • P. Landau
  • R. Abbaschian
Article

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.

Keywords

High Cool Rate Peritectic Reaction Interdendritic Region Electromagnetic Levitation Elemental Microanalysis 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • A. Munitz
    • 1
    Email author
  • M. Bamberger
    • 2
  • A. Venkert
    • 1
  • P. Landau
    • 3
  • R. Abbaschian
    • 4
  1. 1.Nuclear Research Center-NegevBeer-ShevaIsrael
  2. 2.Materials Science and EngineeringTechnionTechnion City, HaifaIsrael
  3. 3.Materials Science and EngineeringBen-Gurion UniversityBeer-ShevaIsrael
  4. 4.College of EngineeringUniversity of CaliforniaRiversideUSA

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