First x-ray scattering studies on electrostatically levitated metallic liquids: demonstrated influence of local icosahedral order on the nucleation barrier.
- K. Kelton, G. W. Lee, D. Robinson
- PhysicsPhysical Review Letters
- 15 May 2003
The first direct experimental demonstration of Frank's complete hypothesis is presented, showing a correlation between the nucleation barrier and a growing icosahedral short-range order with decreasing temperature in a Ti39.5Zr 39.5Ni21 liquid.
Machine vision for high-precision volume measurement applied to levitated containerless material processing
- R. Bradshaw, D. Schmidt, J. Rogers, K. Kelton, R. Hyers
- Physics
- 29 December 2005
By combining the best practices in optical dilatometry with numerical methods, a high-speed and high-precision technique has been developed to measure the volume of levitated, containerlessly…
Convection in Containerless Processing
- R. Hyers, D. Matson, K. Kelton, J. Rogers
- Physics, Materials ScienceAnnals of the New York Academy of Sciences
- 1 November 2004
The methods employed and results obtained for the projects levitation observation of dendrite evolution in steel ternary alloy rapid solidification and quasicrystalline undercooled alloys for space investigation (QUASI) are explained.
Vitrification and determination of the crystallization time scales of the bulk-metallic-glass-forming liquid Zr58.5Nb2.8Cu15.6Ni12.8Al10.3
- C. Hays, J. Schroers, M. B. Robinson
- Materials Science
- 5 September 2001
The crystallization kinetics of Zr58.5Nb2.8Cu15.6Ni12.8Al10.3 were studied in an electrostatic levitation (ESL) apparatus. The measured critical cooling rate is 1.75 K/s.…
Non-contact measurement of creep resistance of ultra-high-temperature materials
- Jong-Hyun Lee, R. Bradshaw, P. Liaw
- Materials Science
- 15 August 2007
Experimental and computer simulation determination of the structural changes occurring through the liquid–glass transition in Cu–Zr alloys
- M. Mendelev, M. Kramer, J. Rogers
- Materials Science
- 6 July 2010
Molecular dynamics (MD) simulations were performed of the structural changes occurring through the liquid–glass transition in Cu–Zr alloys. The total scattering functions (TSF), and their associated…
Rapid chemical and topological ordering in supercooled liquid Cu 46 Zr 54
- V. Wessels, A. Gangopadhyay, K. Kelton
- Physics
- 14 March 2011
Evidence for rapid ordering in a supercooled Cu${}_{46}$Zr${}_{54}$ liquid, obtained from high-energy x-ray diffraction in a containerless processing environment, is presented. Relatively sudden…
Link between liquid structure and the nucleation barrier for icosahedral quasicrystal, polytetrahedral, and simple crystalline phases in Ti-Zr-Ni alloys: Verification of Frank's hypothesis
- G. Lee, A. Gangopadhyay, K. Kelton
- Materials Science
- 8 November 2005
Beamline electrostatic levitator for in situ high energy x-ray diffraction studies of levitated solids and liquids
- A. Gangopadhyay, G. Lee, R. Hyers
- Physics
- 22 June 2005
Determinations of the phase formation sequence, crystal structures and the thermo-physical properties of materials at high temperatures are hampered by contamination from the sample container and…
Modeling of collision and coalescence of droplets during microgravity processing of Zn-Bi immiscible alloys
- J. Rogers, R. H. Davis
- Physics
- 1990
A population balance model is presented for the coarsening of the dispersed phase of liquid-liquid two-phase mixtures in microgravity due to gravity sedimentation and Marangoni migration, which lead…
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