Nonlinearities in the undercooled properties of Ti39.5Zr39.5Ni21

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

doi:10.1080/14786430500253968

Cited by 13 publications

(10 citation statements)

References 11 publications

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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: Discussionsupporting

confidence: 72%

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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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Section: Discussionsupporting

confidence: 72%

“…2 in ref. 19 due to discrepancy in provided fit parameters with experimental data. Estimated error in the given fit parameters was reported as ±0.26%…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2018

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“…The atoms in the B 12 icosahedral unit of B-based compounds are firmly connected by covalent bonds with each other and appear to be remarkably stable. 2 Moreover, the B 12 icosahedral units also seem to survive in the amorphous B.…”

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confidence: 98%

“…11 On the contrary, the viscosity of the liquids forming quasicrystals or related crystals such as AlPdMn and TiZrNi in which a medium range order is considered to exist, substantially increases from 5 mPa s to 20 mPa s with decreasing temperature near the melting temperature and the temperature dependence of the viscosity clearly deviates from the Arrhenius' relation. 12,13 On the basis of these experimental findings, it is worthwhile to examine the possibility of the cluster formation in liquid B through the measurements of viscosity over a temperature range as wide and as low as possible. In the present paper, we report the temperature dependence of the viscosity of liquid B in a large temperature range that includes the supercooled states.…”

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confidence: 99%

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Viscosity of liquid boron

et al. 2010

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Viscosity of liquid boron was measured over the temperature range from 2325 to 2556 K using an electrostatic levitation method combined with an oscillation drop technique. The results obtained revealed that the viscosity increases slowly with decreasing temperature from 2.2 mPa s at 2550 K to 2.6 mPa s at 2370 K, and substantially increases with further decrease in temperature below the melting temperature ͑T m = 2360 K͒, becoming as large as 6.4 mPa s at 2325 K. The increase in the viscosity suggests that clusters with extension may appear in supercooled liquid of boron.Boron ͑B͒ and B-rich compounds combine useful properties such as hardness, low density, and chemical inertness. 1 B-rich solids are characterized by a series of uncommon crystal structures associated with unusual bonding in the solid state. They range from superconducting metals to widegap insulators. The large range of properties originates from the peculiarity of the covalent bonding in pure B and modifications of the bonding when other elements are added to the B network.The crystal structures of B and B-rich compounds are dominated by B 12 units each of which consists of 12 B atoms and possesses the icosahedral structure. The atoms in the B 12 icosahedral unit of B-based compounds are firmly connected by covalent bonds with each other and appear to be remarkably stable. 2 Moreover, the B 12 icosahedral units also seem to survive in the amorphous B. 3 Thus, the question has been raised whether the icosahedral units may survive into liquid B.Until very recently, there have been few experimental measurements on liquid B since it reacts with the walls of containers. The advent of levitation techniques made possible to handle a sample without contamination and to carry out the measurements on the physical properties of liquid B in the temperature region down to the supercooled state. The density and surface tension have been measured with a gas levitation technique. 4 Different density measurements have been performed with a vacuum electrostatic levitator, revealing that B contracts by nearly 3% upon melting. 5 The electrical conductivity of liquid B was measured using a contactless method coupled with gas levitation. It has been shown that the semiconducting property remains even in the liquid state. 6 X-ray diffraction and inelastic x-ray scattering measurements on liquid B were carried out coupled with gas levitation technique in order to address the question whether B 12 icosahedral units may survive into the liquid state. 7,8 No evidence has been obtained on the survival of the icosahedral units into liquid. Ab initio molecular-dynamics simulations of liquid B also suggested that icosahedral arrangements are destroyed upon melting. 8,9 Both of these experimental and simulation studies seem to strongly deny the existence of B 12 icosahedral units in liquid B. Instead, as Price et al. 8 pointed out in their paper, there still remains possibility that small clusters such as pentagonal units could exist in liquid B. In the more deeply supercooled...

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