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X-Ray and Electrostatic Levitation Undercooling Studies in Ti-Zr-Ni Quasicrystals Forming AlloysThe first undercooling nucleation measurements of electrostatic-levitated droplets of TiZrNi alloys that form the icosahedral quasicrystal phase (i-phase) are presented. The reduced undercooling for crystallization decreases with an increasing polytetrahedral order of the primary solidifying phase, supporting the existence of a developing icosahedral short-range order in the undercooled liquid. X-ray diffraction measurements made at the Advance Photon Source on levitated liquid droplets of these alloys at their liquidus temperatures, however, show no evidence for increased icosahedral order. This suggests that significant ordering only occurs below the melting temperature.
Document ID
20030002686
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Rogers, J. R.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Hyers, R. W.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Rathz, T. J.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Kelton, K. F.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Gangopadhyay, A. K.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Woo, G. L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Hannet, L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Krishnan, S.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Curreri, Peter A.
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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