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Undercooling And X-Ray Structural Studies Of Ti-Zr-Ni Liquids

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Abstract

Maximum undercooling results for the icosahedral phase (i-phase), polytetrahedral C14 Laves phase, and solid solution phases are presented as a function of composition in Ti-Zr-Ni liquids. Containerless processing was achieved using the electrostatic levitation facility located at NASA/Marshall Space Flight Center. The maximum reduced undercooling decreases with increasing icosahedral short-range order in the ordered phase. The first synchrotron x-ray diffraction data from aerodynamically levitated liquids of Ti-Zr-Ni alloys suggest an icosahedral short-range order in the liquids, supporting Frank’s hypothesis, correlating icosahedral order in the liquid with the nucleation barrier to the crystal phase. The strong negative heats of mixing between Ti/Zr and Ni and their relative atomic sizes likely favor the formation of this local icosahedral order.

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Authors and Affiliations

  1. Physics Department, Washington University, St. Louis, MO, USA

    G. W. Lee, A. K. Gangopadhyay & K. F. Kelton

  2. University of Alabama, Huntsville, AL, USA

    R. W. Hyers, M. B. Robinson & J. R. Rogers

  3. NASA/ George C.Marshall Space Flight Center, Huntsville, AL, USA

    T. J. Rathz

  4. CNRS-CRMHT, Orleans Cedex 2, France

    L. Hennet

  5. KLA-Tencor Film and Surface Technology, 160 Rio Robles, 95134, San Jose, CA, USA

    S. Krishnan

Authors
  1. G. W. Lee
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  2. A. K. Gangopadhyay
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  3. K. F. Kelton
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  4. R. W. Hyers
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  5. T. J. Rathz
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  6. M. B. Robinson
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  7. J. R. Rogers
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  8. L. Hennet
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  9. S. Krishnan
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Lee, G.W., Gangopadhyay, A.K., Kelton, K.F. et al. Undercooling And X-Ray Structural Studies Of Ti-Zr-Ni Liquids. MRS Online Proceedings Library 754, 105 (2002). https://doi.org/10.1557/PROC-754-CC10.5

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  • DOI: https://doi.org/10.1557/PROC-754-CC10.5

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