Propagation dynamics of individual shear bands during inhomogeneous flow in a Zr-based bulk metallic glass

Maaß, R.; Klaumünzer, David; Löffler, Jörg F.

doi:10.1016/j.actamat.2011.01.060

Cited by 191 publications

(85 citation statements)

References 45 publications

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“…the shear-band velocity increasing [44] and the individual shear propagation process will cover larger displacement V i which means that the larger flow serration could be found in the ( b -ı) curves as shown in Fig. 3.…”

Section: Discussionmentioning

confidence: 94%

“…The enhanced compressive plasticity is generally believed to result from an intrinsic shear-band nucleation rate that increases with decreasing temperature [1,5,7]. However, very recently, Loeffler groups [15,19,44] had suggested that the shearband propagation velocity obeyed an Arrhenius relation with temperature. The shear-band propagation velocity will decrease with the deceasing of temperature.…”

Section: Discussionmentioning

confidence: 99%

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Ambient temperature embrittlement of a Zr-based bulk metallic glass

Jiang¹,

Wang²,

Jiang³

et al. 2012

Materials Science and Engineering: A

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a b s t r a c tThree-point bending experiments were performed on Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit105) bulk metallic glass (BMGs) over a wide range of ambient temperatures varying from the liquid nitrogen temperature (77 K) to about boiling water temperature (370 K). The results demonstrated that the flexural strength of the Zrbased BMG monotonously increased with decreasing of test temperature, whereas plastic deformation ability displayed a maximum at a moderate temperature (about room temperature). That is, the plastic deformation ability was deteriorated by either higher or lower temperature than room temperature through affecting shear band nucleation and propagation within materials respectively.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Ambient temperature embrittlement of a Zr-based bulk metallic glass

Jiang¹,

Wang²,

Jiang³

et al. 2012

Materials Science and Engineering: A

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show abstract

“…There exists, however, a general consensus that the shear band initiation is caused by local structural softening owing to a free volume generation [4][5][6]. The serrated flow was also recognized to occur by stick-slip operation of a single shear band, as has been reported recently [7][8][9]. While a great effort has been made to understand and detail the physical causes of shear bands initiation and propagation, it remains an open question about the mechanism that governs the shear-band arrest (Why do shear bands stop?).…”

Section: Introductionmentioning

confidence: 93%

On the Modelling of the Transient Flow Behavior of Metallic Glasses: Analogy with Portevin-Le Chatelier Effect

Alrasheedi

Yousfi

Hajlaoui

et al. 2016

Metals

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A constitutive model for serrated flow together with a finite element (FE) analysis was developed to simulate discontinuous yielding behavior of metallic glasses, commonly known as serrated flow inhomogeneous deformation. The constructed model is based on transient behavior resulting from the time dependence of the flow defect concentration in the shear bands. The computed results of stress-strain curves were consistent with the experimental data. The main features of the serrated flow effect have also been exhibited by the model.

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“…For the serrated flow in bulk metallic glasses, stress drops in the plastic regime of stress-strain characteristics can be attributed to the motion and arrest of single shear bands 11 . They have been shown to occur either with a Gaussian size distribution, showing chaotic behaviour, or to obey a power-law-type size distribution, indicating self-organized criticality 12,13 .…”

mentioning

confidence: 99%

Crossover from random three-dimensional avalanches to correlated nano shear bands in metallic glasses

et al. 2014

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When applying mechanical stress to a bulk metallic glass it responds with elastic and/or plastic deformations. A comprehensive microscopic theory for the plasticity of amorphous solids remains an open task. Shear transformation zones consisting of dozens of atoms have been identified as smallest units of deformation. The connexion between local formation of shear transformations zones and the creation of macroscopic shear bands can be made using statistical analysis of stress/energy drops or strain slips during mechanical loading. Numerical work has proposed a power law dependence of those energy drops. Here we present an approach to circumvent the experimental resolution problem using a waiting time analysis. We report on the power law-distributed deformation behaviour and the observation of a crossover in the waiting times statistics. This crossover indicates a transition in the plastic deformation behaviour from three-dimensional random activity to a two-dimensional nano shear band sliding.

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Propagation dynamics of individual shear bands during inhomogeneous flow in a Zr-based bulk metallic glass

Cited by 191 publications

References 45 publications

Ambient temperature embrittlement of a Zr-based bulk metallic glass

Ambient temperature embrittlement of a Zr-based bulk metallic glass

On the Modelling of the Transient Flow Behavior of Metallic Glasses: Analogy with Portevin-Le Chatelier Effect

Crossover from random three-dimensional avalanches to correlated nano shear bands in metallic glasses

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