A mean-field model for anelastic deformation in metallic-glasses

Liu, Zy Y.; Yang, Yong

doi:10.1016/j.intermet.2012.03.052

Cited by 22 publications

(9 citation statements)

References 24 publications

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“…However, our current results clearly indicate that structural disordering is only one possible outcome of these inelastic events while the other possible outcome is structural ordering or densification. Furthermore, our results also show that the occurrence of these inelastic results is stochastic, which supports the assumption of stochastic shear transformation as we recently proposed in developing a mean-field anelastic model for MGs 29 33 34 .…”

supporting

confidence: 89%

“…Assuming a probability p ( τ,t ) for the net transition of local structural configurations along the stress direction at time t and shear stress τ , it can be proved that p ( τ,t ) satisfies the following dynamic equation in order to retain the total free energy of the system 29 33 : where ω is the attempt frequency; ΔG is the energy barrier and Ω is the activation volume of the local inelastic event. For a constant shear stress τ at load hold, we obtain: where t R is the average relaxation time of these inelastic events, which equals .…”

mentioning

confidence: 99%

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Probing Stochastic Nano-Scale Inelastic Events in Stressed Amorphous Metal

Yang

Wang

et al. 2014

Sci Rep

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One fundamental yet longstanding issue in materials science is how local inelasticity arises within an amorphous structure before yielding occurs. Although many possible scenarios were postulated or predicted by theories and simulations,however, direct experimental evidence has been lacking today due to the lack of a sensitive way to detect nano-scale inelasticity. Through the carefully designed microcompression method as coupled with the state-of-art nano-scale electric resistance measurement, we here unfold a stochastic inelastic deformation process in a Zr-based metallic glass, which takes place via the recurrence of two types of short-lived inelastic events causing structural damage and recovery, respectively, prior to yielding. Our current findings reveal that these stochastic events not only self-organize into sub-critical events due to elastic coupling, but also compete with each other in a way that enables the whole amorphous structure to self-heal as well as to sustain local damage.

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confidence: 89%

mentioning

confidence: 99%

Probing Stochastic Nano-Scale Inelastic Events in Stressed Amorphous Metal

Yang

Wang

et al. 2014

Sci Rep

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“…Glass transition, anelasticity and plastic flow CoreeShell Model [17,57,75,76] MGs are composed of liquid-like sites (core) embedded into an elastic glassy matrix (shell).…”

Section: Plastic Flowmentioning

confidence: 99%

On the source of plastic flow in metallic glasses: Concepts and models

et al. 2015

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a b s t r a c tWe briefly review the state-of-the-art study on plastic flow in metallic glasses. Especially, we survey the features and behaviors, percolation, and response of the basic deformation units to the activation of stress and temperature, and various models and notions on microscopic flow in metallic glasses. The discussion, comments and perspective on possible unified notation, terminologies and models on plastic flow in metallic glasses are presented. The purpose is to reach a consensus within the community with a hope to eventually unify the notations and models on the deformations in metallic glasses.

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“…This image of soft zones within a hard matrix is widespread in literature, appearing under the names of e.g. solidity and liquidity [46], liquid-like phases [47], cores [48], atomistic free-volume zones [49], nanoscale mechanical heterogeneities [50], soft spots [51], or zones enriched in Geometrically Unfavorable Motifs (GUMs) [52].…”

Section: Parametermentioning

confidence: 99%