The fragility of Al–Ni-based glass-forming melts

Si, Pengchao; Bian, Xiufang; Zhang, Junyan; Li, Hui; Sun, Minhua; Zhao, Yan

doi:10.1088/0953-8984/15/32/302

Cited by 20 publications

(10 citation statements)

References 16 publications

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“…Transforming the signal oscillations into barrier density oscillations, the authors [38] find equally spaced maxima with a separation of about 2k B T m at room temperature. In terms of the glass temperature of the alloy, which according to a differential thermal scanning analysis [39] on similar alloys lies between 500 and 600 K, this is a spacing close to k B T g . If this spacing reflects the increase V 1 of the barrier due to the addition of one atom to an Eshelby region, N c at T g should be around 34.5, close to the two values in Table I. But the experiment holds even more valuable quantitative information, namely the existence of a lower cutoff of the barrier distribution.…”

Section: Evidence In the Glass Phasementioning

confidence: 84%

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An Eshelby model for highly viscous flow

Buchenau¹

2008

J. Phys.: Condens. Matter

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The recent Eshelby description of the highly viscous flow leads to the prediction of a factor of two different viscosities in stationary and alternating flow, in agreement with experimental evidence. The Kohlrausch barrier density increase with increasing barrier height finds a physical justification in the Adam-Gibbs increase of the number of structural alternatives of the Eshelby region with its increasing size. The new Ansatz allows to determine the number of atoms or molecules in the rearranging Eshelby domains from a combination of dynamic shear relaxation and calorimetric data.

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Section: Evidence In the Glass Phasementioning

confidence: 84%

“…(25) implies a glass temperature of T g = 0.4T m /0.17 = 694 K. This is decidedly higher than the estimate of 500 to 600 K for T g in ref. [39], but one must remember that the sample was made by the melt spinning technique [38], at a cooling rate of about 10 6 K/s.…”

Section: Evidence In the Glass Phasementioning

confidence: 99%

An Eshelby model for highly viscous flow

Buchenau¹

2008

J. Phys.: Condens. Matter

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“…The same circumstance has also been found in other two Pd-based metallic glasses, Pd 40 Ni 40 P 20 and Pd 43 Cu 27 Ni 10 P 20 , 73 as well as in Albased alloys. 74 Consequently, the idea that the manner (growthcontrolled or nucleation-controlled vitrification conditions) is the main factor to determine the relationship between the liquid fragility and the GFA of metallic alloys is further verified.…”

Section: The Height Of Energy Barriers Separating the Minima (∆µ) Andmentioning

confidence: 99%

Thermodynamics and Dynamics of Metallic Glass Formers: Their Correlation for the Investigation on Potential Energy Landscape

Bian

Wang

et al. 2005

J. Phys. Chem. B

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Great progress has been made in basic features of the potential energy landscape (PEL) theoretically. The present work, however, attempts to cast new light on it from experimental aspects. By a survey of experimental data related to thermodynamics or dynamics of metallic glass-forming liquids, it is found that the increased rate of excitation of vibrational entropy at glass transition tends to increase the rate of generation of configurational part. Although for the type of metallic materials a generally positive relationship exists between the density of the energy minima at glass transition and the liquid fragility strength, just as expected, our main attention is paid to the phenomenon of the scattering of the slopes. Analysis shows that the phenomenon results from the different average height of energy barriers between minima near glass transition. Investigation on the PdNiP metallic system indicates that the mismatch entropy is a dominant factor in the barrier height: a large value of it results in low energy barriers. Our previous work on the AlNiCe system gives the support to this finding.

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“…The details of measurement process can be seen in our former works [8,9]. An -type X-ray diffractometer of high temperature melts was used for liquid structure experiments.…”

Section: Methodsmentioning

confidence: 99%

A Direct Correlation between Viscosity and Liquid Structure in Cu-Sn Alloys

Zhao

Hou

2017

Advances in Condensed Matter Physics

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The viscosity and liquid structure of Cu 100− Sn ( = 10, 20, 30, 40, at.%) melts were investigated. Temperature dependence of viscosity and correlation length all shows an exponential decay function (Arrhenius-type equation), which is similar to our former studied Cu-Ag alloys. The correlation between viscosity and liquid structure had been studied. A simple relation between viscosity and correlation length was found. The ratio of and shows a linear relationship with temperature, which is different from our former studied results in Cu-Ag alloys. Among the four Cu-Sn alloys, Cu 80 Sn 20 and Cu 70 Sn 30 alloys have higher activation energy for viscous flow ( , ), activation energy for structural evolution ( , ), and the slope ( ) of the linear relationship of / with temperature due to the Cu 3 Sn clusters formation.

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The fragility of Al–Ni-based glass-forming melts

Cited by 20 publications

References 16 publications

An Eshelby model for highly viscous flow

An Eshelby model for highly viscous flow

Thermodynamics and Dynamics of Metallic Glass Formers: Their Correlation for the Investigation on Potential Energy Landscape

A Direct Correlation between Viscosity and Liquid Structure in Cu-Sn Alloys

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