Stick–slip behavior of serrated flow during inhomogeneous deformation of bulk metallic glasses

Torre, Florian H. Dalla; Klaumünzer, David; Maaß, R.; Löffler, Jörg F.

doi:10.1016/j.actamat.2010.03.011

Cited by 113 publications

(54 citation statements)

References 42 publications

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“…19,20 This naturally emerges towards a picture in which the material in an active shear band is believed to be in a state of lower viscosity relative to the surrounding bulk matrix. Viscosity estimates derived from shear rates within the shear band assuming Couette flow 21 and in-situ acoustic emission experiments 22 are in agreement with this, yielding in the former case viscosity values close to those measured at the glass transition and in the latter case volume expansions during shear-band initiation equivalent to those measured in the undercooled liquid regime. Ultrahigh strain rate molecular dynamics simulations also indicate this picture, deriving that the initiation of flow can be viewed as a stress-induced glass transition confined to the shear band.…”

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confidence: 70%

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Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Maaß

Klaumünzer

Villard

et al. 2012

Applied Physics Letters

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Generalized Flory-Huggins theory-based equation of state for ring and chain fluids J. Chem. Phys. 136, 124904 (2012) The plastic and liquid phases of CCl3Br studied by molecular dynamics simulations J. Chem. Phys. 136, 094515 (2012) Rheological, optical, and thermal characterization of temperature-induced transitions in liquid crystal ferrosuspensions J. Appl. Phys. 111, 07B308 (2012) Comment on "Design of acoustic devices with isotropic material via conformal transformation" [Appl. Phys. Lett. 97, 044101 (2010)] Appl. Phys. Lett. 100, 066101 (2012) The role of the isothermal bulk modulus in the molecular dynamics of super-cooled liquids

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“…Further details on the setup can be found elsewhere. 11,21 All samples were prepared from the same master alloy by suction casting of 3 mm rods in an arc-melter. The compression samples were 5 mm long and carefully polished on both ends to assure plane-parallel testing.…”

mentioning

confidence: 99%

Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Maaß

Klaumünzer

Villard

et al. 2012

Applied Physics Letters

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“…4d and f, respectively. It is suggested that the striations are the result of the competition between initiating new shear bands at other sites near the main shear band and reactivating new shear banding events on previously formed shear bands [19,28]. The gradual disappearance of serrations implies that the shear band forms with more difficulty and samples were prone to shear fracture rather than shear slide due to the decrease of free volume content.…”

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confidence: 99%

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

et al. 2011

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Three-point bending experiments were performed on as-cast and annealed samples of Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit105) bulk metallic glasses over a wide range of temperatures varying from room temperature (293 K) to liquid nitrogen temperature (77 K). The results demonstrated that the free volume decrease due to annealing and/or cryogenic temperature can reduce the propensity for the formation of multiple shear bands and hence deteriorate plastic deformation ability. We clearly observed a sharp ductile-to-brittle transition (DBT), across which microscopic fracture feature transfers from micro-scale vein patterns to nano-scale periodic corrugations. Macroscopically, the corresponding fracture mode changes from ductile shear fracture to brittle tensile fracture. The shear transformation zone volume, taking into account free volume, temperature and strain rate, is proposed to quantitatively characterize the DBT behavior in fracture of metallic glasses.

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“…5 Quantitatively describing this serrated flow is rather difficult because experimental methods cannot directly build up the relationship between the shear bands and the serration events. [6][7][8] Since that, a phenomenological model was established to schematically examine the correlation between the shear banding and serration events of metallic glasses by analysing the elastic energy aggregation and release in serration events. 9 Since the serrated flow that corresponds to the discrete bursts of plasticity cannot be elucidated using the continuum theory alone, 10,11 some researchers have applied statistical analysis to investigate the serrated flow behaviour.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent dynamics transition of intermittent plastic flow in a metallic glass. II. Dynamics analysis

Liu

Wang

Chan

et al. 2013

Journal of Applied Physics

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By reducing the testing temperatures down to the temperature well below the glassy transition temperature, the serrated flow behaviour during plastic deformation of a Zr-based metallic glass was experimentally investigated and the results were presented in Part I of the present paper. It shows that the yield strength, the plastic deformation ability, the density of shear bands of the metallic glass increase with decreasing temperature. In order to understand the mechanisms for the changes of the mechanical behaviour at low temperatures, in Part II of this study, the stress-time sequence in the plastic strain regime is characterized by a comprehensive dynamical and statistical analysis. The stress-time sequence is found to exhibit a chaotic state at high temperatures (>203 K), whereas a self-organized critical state is obtained at low temperatures ( 203 K) due to the freezing effect. The reasons for the transition between these two distinct spatio-temporal dynamical states are elucidated by investigating the effect of temperature on the deformation units (shear transformation zones) and the elastic interactions between neighbouring shear bands. The results demonstrate that the low temperatures results in an enhancement of the interactions between the elastic strain fields initiated by neighbouring shear bands, which is primarily responsible for the enhanced plasticity of the metallic glass and a dynamics transition. V C 2013 AIP Publishing LLC.

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Stick–slip behavior of serrated flow during inhomogeneous deformation of bulk metallic glasses

Cited by 113 publications

References 42 publications

Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

Temperature dependent dynamics transition of intermittent plastic flow in a metallic glass. II. Dynamics analysis

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