Equilibrium viscosity, enthalpy recovery and free volume relaxation in a Zr44Ti11Ni10Cu10Be25 bulk metallic glass

Evenson, Zach; Busch, Ralf

doi:10.1016/j.actamat.2011.03.064

Cited by 98 publications

(51 citation statements)

References 49 publications

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“…logη Determination of fragility usually requires a stable supercooled liquid region, in which the viscosity or structural relaxation times can be measured as a function of temperature [12,13].…”

Section: Tg T G T T D D Mmentioning

confidence: 99%

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Wei¹,

Coleman²,

Lucas³

et al. 2017

Phys. Rev. Applied

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Glass transition temperatures (T g ) and liquid fragilities are measured along a line of constant Ge content in the system Ge-As-Te, and contrasted with the lack of glass-forming ability in the twin system Ge-Sb-Te at the same Ge content. The one composition established as free of crystal contamination in the latter system shows a behavior opposite to that of more covalent system.Comparison of T g vs bond density in the three systems Ge-As-chalcogen differing in chalcogen i.e. S, Se, or Te, shows that as the chalcogen becomes more metallic, i.e. in the order S = 2.3.When the more metallic Sb replaces As at greater than 2.3, incipient metallicity rather than directional bond covalency apparently gains control of the physics. This leads us to an examination of the electronic conductivity and, then, semiconductor-to-metal (SC-M) transitions, with their associated thermodynamic manifestations, in relevant liquid alloys. The thermodynamic components, as seen previously, control liquid fragility and cause fragile-tostrong transitions during cooling. We tentatively conclude that liquid state behavior in phase change materials (PCMs) is controlled by liquid-liquid (SC-M) transitions that have become submerged below the liquidus surface. In the case of the Ge-Te binary, a crude extrapolation to GeTe stoichiometry indicates that the SC-M transition lies about 20% below the melting point, suggesting a parallel with the intensely researched "hidden liquid-liquid (LL) transition", in supercooled water. In the water case, superfast crystallization initiates in the high fragility domain some 4% above the T LL which is located at ~15% below the (ambient pressure) melting point.

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Section: Tg T G T T D D Mmentioning

confidence: 99%

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Wei¹,

Coleman²,

Lucas³

et al. 2017

Phys. Rev. Applied

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“…[17][18][19] Additionally, comprehensive measurements of enthalpy recovery, volume and viscosity during aging of this composition have been carried out previously, 16 allowing for a detailed comparison of microscopic and bulk macroscopic properties. Amorphous rods of Zr44Ti11Ni10Cu10Be25 were supplied by Liquidmetal ® Technologies.…”

Section: Methodsmentioning

confidence: 99%

“…The cooling rate of the rod is estimated to be 10-50 K/s. 17,20 Differential scanning calorimetry experiments 16 have determined a Tg = 620 K at a heating rate of 25 K/min.…”

Section: Methodsmentioning

confidence: 99%

“…[8][9][10][11][12][13] The existence of distinct structural rearrangements far below Tg, 8 compressed exponential relaxation functions 10 and intermittent aging dynamics 11 all suggest a complex microscopic picture of metallic glass aging, not reflected in measurements of bulk macroscopic quantities. [14][15][16] Here we investigate the microscopic dynamics in the Zr44Ti11Ni10Cu10Be25 (Vitreloy 1b) BMG. In particular, we present some intriguing features of the atomic-scale structural relaxation, as revealed by state-of-the art XPCS techniques, and compare and contrast them to previously investigated simple and glass-forming metallic systems.…”

Section: Introductionmentioning

confidence: 99%

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Comparing the atomic and macroscopic aging dynamics in an amorphous and partially crystalline Zr₄₄Ti₁₁Ni₁₀Cu₁₀Be₂₅bulk metallic glass

et al. 2017

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2Several recent x-ray photon correlation spectroscopy works have reported an anomalous atomic dynamics in hyper-quenched metallic glasses. Here, we compare and contrast these microscopic dynamics with that found in a Zr44Ti11Ni10Cu10Be25 bulk metallic glass, prepared with a cooling rate some 6 orders of magnitude lower. In both cases, structural relaxation in the glass is governed by internal stresses, giving rise to highly compressed density correlation functions. Differently from the fast aging reported in previous studies, here the atomic dynamics displays a slow linear atomic-level aging, while not affecting the shape parameter.Traditional macroscopic phenomenological models fail to capture the temperature dependence of the microscopic structural relaxation time, suggesting a length scale dependence of the aging. Interestingly, the dynamics does not seem to be affected by the presence of a low percentage of frozen in nanocrystals and displays a temperature dependence similar to that observed in macroscopic viscosity measurements.3

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“…The latter involves a long-range rearrangement of atoms associated with the redistribution and reduction of the excess free volume. 2 The decrease of the free volume upon annealing results in higher viscosity, 5 density, 6 and tensile strength, 7 lower plasticity, 7,8 and better soft magnetic properties. 9 Hence, characterization of the excess free volume is important for understanding the relationship between the atomic structure and properties of MGs.…”

Section: Introductionmentioning

confidence: 99%

Thermal and soft magnetic properties of Co40Fe22Ta8B30 glassy particles: In-situ X-ray diffraction and magnetometry studies

Taghvaei

Stoica

Kaban

et al. 2014

Journal of Applied Physics

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Articles you may be interested inThe soft magnetic properties of ring-shaped (Co0.6Fe0.3Ni0.1)68(B0.811Si0.189)27Nb5 bulk metallic glasses J. Appl. Phys. 113, 17A336 (2013) The structural evolution of Co 40 Fe 22 Ta 8 B 30 glassy particles has been studied by in-situ high-energy synchrotron X-ray diffraction (XRD) upon isochronal annealing. The changes in position, intensity, and full width at half maximum (FWHM) of the first and second diffuse maxima of the XRD patterns suggest the occurrence of irreversible structural relaxation upon the first heating up to a temperature close to the glass transition temperature T g . The variations in reduced pair correlation functions upon annealing are discussed in the frame of the topological fluctuation theory for structural relaxation. Isochronal annealing of the Co 40 Fe 22 Ta 8 B 30 glassy particles improves their soft magnetic properties through decreasing the coercivity and increasing the magnetic susceptibility, saturation magnetization, and Curie temperature. V C 2014 AIP Publishing LLC.

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Equilibrium viscosity, enthalpy recovery and free volume relaxation in a Zr44Ti11Ni10Cu10Be25 bulk metallic glass

Cited by 98 publications

References 49 publications

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Comparing the atomic and macroscopic aging dynamics in an amorphous and partially crystalline Zr₄₄Ti₁₁Ni₁₀Cu₁₀Be₂₅bulk metallic glass

Thermal and soft magnetic properties of Co40Fe22Ta8B30 glassy particles: In-situ X-ray diffraction and magnetometry studies

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Equilibrium viscosity, enthalpy recovery and free volume relaxation in a Zr44Ti11Ni10Cu10Be25 bulk metallic glass

Cited by 98 publications

References 49 publications

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Glass Transitions, Semiconductor-Metal Transitions, and Fragilities in Ge−V−Te ( V=As , Sb) Liquid Alloys: The Difference One Element Can Make

Comparing the atomic and macroscopic aging dynamics in an amorphous and partially crystalline Zr44Ti11Ni10Cu10Be25bulk metallic glass

Thermal and soft magnetic properties of Co40Fe22Ta8B30 glassy particles: In-situ X-ray diffraction and magnetometry studies

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Comparing the atomic and macroscopic aging dynamics in an amorphous and partially crystalline Zr₄₄Ti₁₁Ni₁₀Cu₁₀Be₂₅bulk metallic glass