Plastic avalanches in the so-called elastic regime of metallic glasses

Lagogianni, Alexandra E.; Liu, Chen; Martens, Kirsten; Samwer, K.

doi:10.1140/epjb/e2018-90051-7

Cited by 17 publications

(20 citation statements)

References 46 publications

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“…In this context, it was shown by Spigler and Franz [3] that the hierarchical structure of phase space should result in a peculiar response to mechanical deformation, somewhat similar to the one observed in flowing systems. Shear transformations associated with stress or energy drops have long been observed in the elastic regime at low temperature both in experiment and simulation [8][9][10][11]. However, the events observed at small deformation are generally localized, partly reversible and thermal-history dependant, in contrast with steady state [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Elastic avalanches reveal marginal behavior in amorphous solids

Shang

Guan

Barrat

2019

Proc. Natl. Acad. Sci. U.S.A.

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Mechanical deformation of amorphous solids can be described as consisting of an "elastic" in which the stress increases linearly with strain, up to a yield point at which the solid either fractures or starts deforming plastically. It is well established, however, that the apparent linearity of stress with strain is actually a proxy for a much more complex behavior, with a microscopic plasticity that is reflected in diverging nonlinear elastic coefficients [1,2]. Very generally, the complex structure of the energy landscape is expected to induce a singular response to small perturbations. In the athermal quasistatic regime, this response manifests itself in the form of a scale free plastic activity.The distribution of the corresponding avalanches should reflect, according to theoretical mean field calculations [3], the geometry of phase space in the vicinity of a typical local minimum. In this work, we characterize this distribution for simple models of glass forming systems, and we find that its scaling is compatible with the mean field predictions for systems above the jamming transition.These systems exhibit marginal stability, and scaling relations that hold in the stationary state are examined and confirmed in the elastic regime. By studying the respective influence of system size and age, we suggest that marginal stability is systematic in the thermodynamic limit.

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Section: Introductionmentioning

confidence: 99%

Elastic avalanches reveal marginal behavior in amorphous solids

Shang

Guan

Barrat

2019

Proc. Natl. Acad. Sci. U.S.A.

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“…60 GPa) along with increased elastic strain limits to ~ 3%. In that work, the authors argued that the decreased elastic modulus under compression was linked to the activation of STZs below the elastic limit, which could be linked to the observation of prominent load drops; observations recently supported by molecular dynamics simulations [57,58]. In this work, no discrete load drops were observed below the elastic limit; however, the current micro-pillars have a larger ~ 3 µm diameter which would be expected to suppress the relative influence of discrete STZs formed at local soft spots.…”

Section: Transition From a Negative To Positive Srsmentioning

confidence: 94%

High strain rate in situ micropillar compression of a Zr-based metallic glass

Ramachandramoorthy

Yang

Casari

et al. 2021

Journal of Materials Research

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High strain rate micromechanical testing can assist researchers in elucidating complex deformation mechanisms in advanced material systems. In this work, the interactions of atomic-scale chemistry and strain rate in affecting the deformation response of a Zr-based metallic glass was studied by varying the concentration of oxygen dissolved into the local structure. Compression of micropillars over six decades of strain rate uncovered a remarkable reversal of the strain rate sensitivity from negative to positive above ~ 5 s−1 due to a delocalisation of shear transformation events within the pre-yield linear regime for both samples, while a higher oxygen content was found to generally decrease the strain rate sensitivity effect. It was also identified that the shear band propagation speed increases with the actuation speed, leading to a transition in the deformation behaviour from serrated to apparent non-serrated plastic flow at ~ 5 s−1. Graphic abstract

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“….Some experiments have shown avalanche distribution with exponents compatible with the mean field universality class 28,151 , in agreement with a Mean Field plasticity model 31 . On the other hand, other results obtained by Molecular Dynamics simulations 152 , elasto-plastic 24 , and fully tensorial models 153 , yield critical exponents incompatible with the mean field approach. However, recent results obtained from elasto-plastic models show that the MF exponents are recovered in the limit of high strain rates 154 .…”

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confidence: 80%

“…The first one is the elastic regime, and it is characterized by a linear relationship between stress and strain following Hooke´s law. Although the actual existence of a purely elastic regime in metallic glasses is currently questioned, as was discussed in the previous chapter 152 , the elastic regime was historically defined by a good fit of the Hook´s law to the stress-strain curve, regardless of the fine structure of the data. The Elastic Modulus (Young modulus in the case of tensile uniaxial deformation) can be determined from the elastic region as the proportionality constant between the stress and strain: 𝜎 = 𝐸 𝜀.…”

Section: Stress-strain Measurementsmentioning

confidence: 99%

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Avalanche Dynamics and Magnetoelastic Coupling in Metallic Glasses

Gómez¹

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B Evaluation of W as fragility estimator……………………………………………...141 C Magnetic domains in ribbons under tensile loading……………………......142 Literature………………………………………………………………………………………...145 List of figures……………………………………………………………………………..…….155

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Plastic avalanches in the so-called elastic regime of metallic glasses

Cited by 17 publications

References 46 publications

Elastic avalanches reveal marginal behavior in amorphous solids

Elastic avalanches reveal marginal behavior in amorphous solids

High strain rate in situ micropillar compression of a Zr-based metallic glass

Avalanche Dynamics and Magnetoelastic Coupling in Metallic Glasses

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