Unexpectedly large relaxation time determined by in situ high-frequency shear modulus measurements near the glass transition of bulk glassy Pd40Cu30Ni10P20

Khonik, V. A.; Mitrofanov, Yu.P.; Khonik, S. V.; Saltykov, S. N.

doi:10.1016/j.jnoncrysol.2010.04.001

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…Integration of the AES allows calculating the change of the concentration ∆c of defect annealing out upon structural relaxation below T g . For the AES shown in Figure 5, this gives ∆c = 0.00161, close to the values determined for other MGs (0.00112 ≤ ∆c ≤ 0.00322 [63,72,73]). The full concentration of interstitialcy defects frozen-in upon glass formation can be determined as c(…”

Section: Activation Energy Spectrasupporting

confidence: 84%

“…At temperatures T < T pc , the shear modulus G < G eq (i.e., the current defect concentration c is bigger than the defect concentration c eq in the metastable equilibrium state), and therefore, structural relaxation leads to an increase of G. On the contrary, at T > T pc , the shear modulus G > G eq (respectively, c < c eq ) and structural relaxation decreases it. Different signs of shear modulus relaxation are indeed experimentally observed [63].…”

Section: Relaxation Kineticsmentioning

confidence: 62%

“…This AES starts from the activation energy slightly less than 1.2 eV (this corresponds to temperatures of about 400 K) and ends at activation energies answering to T g [63,72]. Integration of the AES allows calculating the change of the concentration ∆c of defect annealing out upon structural relaxation below T g .…”

Section: Activation Energy Spectramentioning

confidence: 99%

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Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Khonik

2015

Metals

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A review of the new approach to the understanding of the structural relaxation of metallic glasses based on the Interstitialcy theory has been presented. The key hypothesis of this theory proposed by Granato consists of the statement that the thermodynamic properties of crystalline, liquid and glassy states are closely related to the interstitial defects in the dumbbell (split) configuration, called also interstitialcies. It has been argued that structural relaxation of metallic glasses takes place through a change of the concentration of interstitialcy defects frozen-in from the melt upon glass production. Because of a strong interstitialcy-induced shear softening, the defect concentration can be precisely monitored by measurements of the unrelaxed shear modulus. Depending on the relation between the current interstitialcy concentration c and interstitialcy concentration in the metastable equilibrium, different types of structural relaxation (decreasing or increasing c) can be observed. It has been shown that this approach leads to a correct description of the relaxation kinetics at different testing conditions, heat effects occurring upon annealing, shear softening and a number of other structural relaxation-induced phenomena in metallic glasses. An intrinsic relation of these phenomena with the anharmonicity of the interatomic interaction has been outlined. A generalized form of the interstitialcy approach has been reviewed.

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Section: Activation Energy Spectrasupporting

confidence: 84%

Section: Relaxation Kineticsmentioning

confidence: 62%

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Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Khonik

2015

Metals

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“…This leads to the kinetic "freezing" of the structure on the experimental time scale. Large relaxation times (of about 1200 se500 s at and slightly above T g and increasingly bigger at T < T g ) were indeed recently found by in situ measurements of the shear modulus in the supercooled liquid state of the same metallic glass [18].…”

Section: Shear Modulus Relaxation and Recovery In Initial Samplessupporting

confidence: 60%

Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

Mitrofanov¹,

Khonik²,

Lyakhov³

et al. 2011

Intermetallics

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“…43,44 The measured value of G ∞ for metallic glasses not only depends on the temperature, but also on tw and thermal history of the sample. [43][44][45] In general, we estimate that these effects would increase G ∞ by a maximum of around 10 % at the lowest investigated temperatures. This uncertainty has been incorporated into our analysis; however, it is well within the error bars of the viscosity values reported in…”

Section: Resultsmentioning

confidence: 77%

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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Unexpectedly large relaxation time determined by in situ high-frequency shear modulus measurements near the glass transition of bulk glassy Pd40Cu30Ni10P20

Cited by 12 publications

References 19 publications

Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

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

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Unexpectedly large relaxation time determined by in situ high-frequency shear modulus measurements near the glass transition of bulk glassy Pd40Cu30Ni10P20

Cited by 12 publications

References 19 publications

Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Understanding of the Structural Relaxation of Metallic Glasses within the Framework of the Interstitialcy Theory

Recovery of the shear modulus of relaxed bulk glassy Pd40Cu30Ni10P20 by cooling from elevated temperatures at low rates

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

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