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

  • G.W. Lee (a1), A.K. Gangopadhyay (a1), K.F. Kelton (a1), R.W. Hyers (a2), T.J. Rathz (a3), M.B. Robinson (a2), J. R. Rogers (a2), L. Hennet (a4) and S. Krishnan (a5)...

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

  • G.W. Lee (a1), A.K. Gangopadhyay (a1), K.F. Kelton (a1), R.W. Hyers (a2), T.J. Rathz (a3), M.B. Robinson (a2), J. R. Rogers (a2), L. Hennet (a4) and S. Krishnan (a5)...

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