Surface Tension and Viscosity of Quasicrystal-Forming Ti–Zr–Ni Alloys

Hyers, R. W.; Bradshaw, Richard C.; Rogers, J. R.; Rathz, T. J.; Lee, G. W.; Gangopadhyay, A. K.; Kelton, K. F.

doi:10.1023/b:ijot.0000038507.99417.5b

Cited by 29 publications

(19 citation statements)

References 6 publications

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“…The viscosity at each temperature was measured using the oscillating drop technique 39,40 , in which the levitation electric field was modulated near the l ¼ 2 (second spherical harmonic, or surface dipole oscillation) resonant frequency (120-140 Hz) of the liquid to induce surface vibrations. The surface deformation was captured as high-speed (1,560 frames per second) videos of the silhouettes of the liquid samples.…”

Section: Vit106amentioning

confidence: 99%

A structural signature of liquid fragility

et al. 2014

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Virtually all liquids can be maintained for some time in a supercooled state, that is, at temperatures below their equilibrium melting temperatures, before eventually crystallizing. If cooled sufficiently quickly, some of these liquids will solidify into an amorphous solid, upon passing their glass transition temperature. Studies of these supercooled liquids reveal a considerable diversity in behaviour in their dynamical properties, particularly the viscosity. Angell characterized this in terms of their kinetic fragility. Previous synchrotron X-ray scattering studies have shown an increasing degree of short-and medium-range order that develops with increased supercooling. Here we demonstrate from a study of several metallic glass-forming liquids that the rate of this structural ordering as a function of temperature correlates with the kinetic fragility of the liquid, demonstrating a structural basis for fragility.

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Section: Vit106amentioning

confidence: 99%

A structural signature of liquid fragility

et al. 2014

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“…18 This was evident through the post-processing analysis of the sample, which showed a mass gain of 0.085 mg. The calculated surface tension matches more closely with sample STL-625 within Bradshaw et al 19 …”

Section: Discussionmentioning

confidence: 95%

Faraday forcing of high-temperature levitated liquid metal drops for the measurement of surface tension

et al. 2018

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In this work, a method for the measurement of surface tension using continuous periodic forcing is presented. To reduce gravitational effects, samples are electrostatically levitated prior to forcing. The method, called Faraday forcing, is particularly well suited for fluids that require high temperature measurements such as liquid metals where conventional surface tension measurement methods are not possible. It offers distinct advantages over the conventional pulse-decay analysis method when the sample viscosity is high or the levitation feedback control system is noisy. In the current method, levitated drops are continuously translated about a mean position at a small, constant forcing amplitude over a range of frequencies. At a particular frequency in this range, the drop suddenly enters a state of resonance, which is confirmed by large executions of prolate/oblate deformations about the mean spherical shape. The arrival at this resonant condition is a signature that the parametric forcing frequency is equal to the drop’s natural frequency, the latter being a known function of surface tension. A description of the experimental procedure is presented. A proof of concept is given using pure Zr and a Ti39.5Zr39.5Ni21 alloy as examples. The results compare favorably with accepted literature values obtained using the pulse-decay method.

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“…For α 2 > 59, the deviation from the resonant frequency from Rayleigh's analysis is less than 1 % [23].…”

Section: Surface Tension and Viscositymentioning

confidence: 86%

Thermophysical Property Measurements of Liquid Gadolinium by Containerless Methods

et al. 2010

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Thermophysical properties of liquid gadolinium were measured using non-contact diagnostic techniques with an electrostatic levitator. Over the 1585 K to 1920 K temperature range, the density can be expressed aswhere T m = 1585 K, yielding a volume expansion coefficient of 6.2 × 10 −5 K −1 . In addition, the surface tension data can be fitted as γ (T ) = 8.22 × 10 2 − 0.097(T − T m )(10 −3 N · m −1 ) over the 1613 K to 1803 K span and the viscosity as η(T ) = 1.7exp[1.4 × 10 4 /(RT )](10 −3 Pa · s) over the same temperature range.

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Surface Tension and Viscosity of Quasicrystal-Forming Ti–Zr–Ni Alloys

Cited by 29 publications

References 6 publications

A structural signature of liquid fragility

A structural signature of liquid fragility

Faraday forcing of high-temperature levitated liquid metal drops for the measurement of surface tension

Thermophysical Property Measurements of Liquid Gadolinium by Containerless Methods

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