Mechanical properties of Al–Y–Ni amorphous ribbons

Freitag, J. M.; Koknaev, R. G.; Sabet‐Sharghi, R.; Koknaeva, M.R.; Altounian, Z.

doi:10.1063/1.361824

Cited by 14 publications

(6 citation statements)

References 5 publications

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“…In each run, the following cycle, consisting of three stages, was repeated 20 times: 0.2, 0.02, and 0.002 mN, each for 200 s. The stiffness measured from the instantaneous, elastic, displacement agreed with the calculated value, 19 based on a Young's modulus value of E 0 ¼ 48.2 GPa (Ref. 20) for a similar alloy. Displacement versus time data obtained during each full-load stage were used in the analysis, each consisting of 5000 points.…”

Section: Methodsmentioning

confidence: 87%

An atomically quantized hierarchy of shear transformation zones in a metallic glass

Ju¹,

Jang²,

Nwankpa³

et al. 2011

Journal of Applied Physics

109

103

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Quasistatic measurements of room-temperature anelastic relaxation were used to characterize the properties of shear transformation zones (STZs) in amorphous Al 86.8 Ni 3.7 Y 9.5 in the dilute limit. Using a combination of nanoindenter cantilever bending and mandrel bend relaxation techniques, anelastic relaxation was measured over times ranging from 1 s to 3 Â 10 7 s. Direct spectrum analysis yields relaxation-time spectra, which display seven distinct peaks. The results were analyzed using a linear dashpot-and-spring model, combined with transition-state theory, to yield several STZ properties. These reveal a quantized hierarchy of STZs that differ from each other by one atomic volume. Potential STZs occupy a large volume fraction of the solid. They access their ergodic space, with the ratio of forward-to backward jump rates ranging from 1.03 to 4.3 for the range of stress values used.

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Section: Methodsmentioning

confidence: 87%

An atomically quantized hierarchy of shear transformation zones in a metallic glass

Ju¹,

Jang²,

Nwankpa³

et al. 2011

Journal of Applied Physics

109

103

View full text Add to dashboard Cite

show abstract

“…The volume fraction occupied by PSTZs of size n is given by [17] (Fig. 3), where E 0 is the high-frequency Young's modulus, 48.2 GPa [24]. This relationship is based on the determination that the STZs are at internal equilibrium, so that the ensembleaveraged strain of all n-size STZs is equal to the time-averaged strain of each n-size STZ.…”

Section: Resultsmentioning

confidence: 99%

Microscopic description of flow defects and relaxation in metallic glasses

Atzmon

2014

Phys. Rev. E

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The anelastic relaxation behavior of amorphous Al86.8Ni3.7Y9.5 was characterized in prolonged, quasistatic measurements, up to 1.1×10(8) s. The size-density distribution of potential shear transformation zones was determined from the data. We derive an expression for the distribution, based on a free-volume criterion for an atomic cluster being a potential shear transformation zone. The model is shown to be consistent with experiment.

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“…21into Eq. (19) and fitting the entire range of data yields γ T 0 ¼ 0:18 and Ω 21 ¼ 4:8 Â 10 À28 m 3 with random errors of 1.5% and 3%, respectively. Since the error in (γ T 0 ) 2 Â Ω 21 is much smaller, these two errors are strongly correlated.…”

Section: Journal Of Applied Physicsmentioning

confidence: 96%

“…with a random error of only a small fraction of a percent because this term appears in the exponent in Eq. (19). Substituting Eq.…”

Section: Journal Of Applied Physicsmentioning

confidence: 99%

Activation volume details from nonlinear anelastic deformation of a metallic glass

Lei

Atzmon

2019

Journal of Applied Physics

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At high stress, the viscosity of a metallic glass is non-Newtonian, and therefore the rate of anelastic stress relaxation is not linear in the applied stress. In this regime, one can obtain information on the details of the activation volume that are not accessible in the linear regime. While bending in the nonlinear regime introduces a complicated stress state, it offers great stability for noninstrumented measurements over many orders of magnitude of time. We have developed a method of controlled sample bending to a strain of up to ∼0.0155 for Al 86.8 Ni 3.7 Y 9.5 metallic glass. Significant nonlinearity of the anelastic strain in the stress was observed, which is mainly associated with the largest and slowest shear transformation zones involved not reaching mechanical equilibrium at the end of the constraining period. Combining nonlinear kinetics under constraint and zero bending moment after constraint removal, the volume of the largest shear transformation zones and the transformation shear strain were obtained independently for the inherent state-their most likely values are 4.8 × 10 −28 m 3 and 0.18, respectively.

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Mechanical properties of Al–Y–Ni amorphous ribbons

Cited by 14 publications

References 5 publications

An atomically quantized hierarchy of shear transformation zones in a metallic glass

An atomically quantized hierarchy of shear transformation zones in a metallic glass

Microscopic description of flow defects and relaxation in metallic glasses

Activation volume details from nonlinear anelastic deformation of a metallic glass

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