Relaxation of metallic glass structure measured by elastic modulus and internal friction

Bothe, Klaus; Neuhäuser, H.

doi:10.1016/0022-3093(83)90481-7

Cited by 32 publications

(8 citation statements)

References 24 publications

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“…Equation (4) at long times t ≫ τ gives the well-known "lnt" kinetics, which is often experimentally observed upon isothermal annealing of as-cast MGs [64,66,68]. In particular, such behavior is documented for the shear modulus change upon structural relaxation far below T g , even for very long annealing time [67,69].…”

Section: Relaxation Kineticsmentioning

confidence: 91%

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: Relaxation Kineticsmentioning

confidence: 91%

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

Khonik

2015

Metals

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“…Inspired by their experimental observation, we did the same fitting for the MDsimulated Cu x Zr 100Àx MGs (x = 20, 30,46,50,55,64,70,80) [269], and the results are shown in Fig. 40.…”

Section: Mro: a Fractal Packing Propositionmentioning

confidence: 95%

“…The presence of such ''inclusions'' is partly why the shear modulus of MGs is smaller than that of the corresponding crystals. The inelastic nature and damping effects of these inclusions under cyclic agitation are also likely to be the origin of the internal friction [54][55][56][57] and the softened transverse phonons [58] in MGs. Recent work suggests that they may also be responsible for the widely observed boson peak [397,398].…”

Section: Shear Modulus and Elasticity: Percolation Of Rigiditymentioning

confidence: 97%

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Atomic-level structure and structure–property relationship in metallic glasses

Cheng

2011

Progress in Materials Science

1,491

933

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“…2 On the other hand, the relaxation time spectrum can be derived using the stretched exponential Kohlrausch-Williams-Watts relaxation function 3-5 or by applying different mechanical models (combinations of springs and viscous Newtonian dashpots with different elasticities and shear viscosities), which assume a superposition of exponential Debye relaxations. 6 Finally, the activation energy spectrum (AES) can be find within the framework of the AES-model, [7][8][9][10][11] which was originally derived for first-order kinetic processes with distributed activation parameters. 12 In all cases, broad activation spectra are observed.…”

mentioning

confidence: 99%

Determination of the activation energy spectrum of structural relaxation in metallic glasses using calorimetric and shear modulus relaxation data

Tsyplakov

Mitrofanov

Макаров

et al. 2014

Journal of Applied Physics

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Articles you may be interested inInterrelationship between the shear modulus of a metallic glass, concentration of frozen-in defects, and shear modulus of the parent crystal Appl. Phys. Lett. 102, 091908 (2013); 10.1063/1.4794987 On the nature of enthalpy relaxation below and above the glass transition of metallic glasses Relaxation of the shear modulus of a metallic glass near the glass transition J. Appl. Phys. 109, 073518 (2011); 10.1063/1.3569749Recovery of structural relaxation in aged metallic glass as determined by high-precision in situ shear modulus measurements

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Relaxation of metallic glass structure measured by elastic modulus and internal friction

Cited by 32 publications

References 24 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

Atomic-level structure and structure–property relationship in metallic glasses

Determination of the activation energy spectrum of structural relaxation in metallic glasses using calorimetric and shear modulus relaxation data

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