Inherent strength of zirconium-based bulk metallic glass

Bakaı̆, A. S.; Shpak, A. P.; Wanderka, N.; Котречко, С. А.; Mazilova, T. I.; Mikhaĭlovskij, I. M.

doi:10.1016/j.jnoncrysol.2010.03.009

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…Therefore, it follows from Equation (23) that Z(x 0 ) depends on σ e as 0 1/ ( ) . e g x σ This result validates relation (19) for activation volume at low stresses.…”

Section: Thermally Activated Slidingsupporting

confidence: 86%

“…Thus, the sliding layer can consist of intermitting areas of different local microstructure. The field emission microscopy clearly demonstrates existence of the boundary layers of width ∼1 nm [19,24,37] but does not allow to resolve details of the boundary microstructure. Therefore, the microscopic structure of boundaries is an issue of further structural investigations and computer simulations.…”

Section: Discussionmentioning

confidence: 94%

“…It means that peculiarities of MG structure on the scale of ∼10 nm play a key role in the shear transformation and initiation of shear bands. Recent experimental investigations on tensile strength [19,20] revealed a strong size effect when the specimen size is < 100 nm. These results indirectly point out the structure heterogeneities of about 10 nm in size.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical strength and homogeneous sliding in metallic glass: exactly solvable model

Lazarev

Bakaı̆

2013

Journal of the Mechanical Behavior of Materials

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At low temperature, T→0, the yield stress of a perfect crystal is equal to its so-called theoretical strength. The yield stress of nonperfect crystals is controlled by the stress threshold of dislocation mobility. A noncrystalline solid has neither an ideal structure nor gliding dislocations. Its yield stress, that is, the stress at which the macroscopic inelastic deformation starts, depends on distribution of local, attributed to each atomic site, critical stresses at which the local inelastic deformation occurs. We describe exactly solvable model of planar layer strength and sliding with an arbitrary homogeneous distribution of local critical stresses. The rate of the thermally activated sliding is closely related to parameters of the low-temperature strength. The sliding activation volume scales with the applied external stress as -, e β σ where β < 1. The proposed model accounts for mechanisms and the yield stress of the low-temperature deformation of polycluster metallic glasses, because intercluster boundaries of a polycluster metallic glass are natural sliding layers of the described type.

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“…Therefore, it follows from Equation (23) that Z(x 0 ) depends on σ e as 0 1/ ( ) . e g x σ This result validates relation (19) for activation volume at low stresses.…”

Section: Thermally Activated Slidingsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical strength and homogeneous sliding in metallic glass: exactly solvable model

Lazarev

Bakaı̆

2013

Journal of the Mechanical Behavior of Materials

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“…The total evaporated volume of the studied material was in the interval from 10 5 to 10 7 nm 3 . This total tested volume is a sum of gauge volume at a maximum voltage and that of the specimen segment field evaporated during the experiment without failure at the steady field strength and hence the constant mechanical stress [8,9]. The total gauge volume is described in terms of the statistical failure distribution as the reference volume related to the given failure stress σ c ¼14.4 GPa close to the theoretical strength of the GB.…”

Section: Resultsmentioning

confidence: 99%

Special non-CSL grain boundaries in tungsten: Misorientation distribution and energetics

et al. 2015

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“…On the other hand, study of nanosized crystals enables to ascertain the fundamental mechanisms of deformation and fracture inherent in the nanoscale. Fabrication of defect-free nanocrystals and their compression test [1][2][3], as well as the development of a high-field technique for the preparation and in-situ tensile testing of nanoneedles [4][5][6], becomes a milestone event in experimental studies of nanosized crystals. Absence of defects (dislocations and twins) in these crystals made it possible to reach extremely high levels of strength, which are close to the value of "theoretical strength".Th er ef or e ,mo le cular dynamics (MD) simulation is the most effective tool for studying atomic mechanisms to reach extremely high levels of strength in crystals.…”

Section: Introductionmentioning

confidence: 99%

Atomic Mechanisms Governing Strength of Metallic Nanosized Crystals

Котречко¹,

Ovsijannikov²,

Mikhaĭlovskij³

et al. 2018

Molecular Dynamics

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Fundamentals of the atomic mechanisms governing the strength of nanosized metallic crystals are described. An attempt is made to explain on this basis the size and orientation effects, temperature dependence of strength and atomism of fracture of bcc crystals under triaxial uniform (hydrostatic) tension. A feature of the proposed material is that it combines the results of molecular dynamics simulation with the data of experimental research findings on failure of metallic nanosized crystals under the high-field mechanical loading. It is exhibited that local instability of the lattice is the main mechanism governing the strength of defect-free nanosized crystals (NSC). Based on the concept of local instability, an explanation is given of the nature of the size effect in NSC, as well as of the differences in its manifestation in nanocrystals with bcc and fcc lattices. The concept of the mechanism of thermal activation of local instability is outlined. This enables to explain the specific features of the temperature dependence of NSC. The results of experimental studies and molecular dynamics simulation of the failure of tungsten nanocrystals under hydrostatic tension are presented. The ideas about the atomism of the bcc-fcc transition in these conditions are articulated.

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Inherent strength of zirconium-based bulk metallic glass

Cited by 14 publications

References 21 publications

Theoretical strength and homogeneous sliding in metallic glass: exactly solvable model

Theoretical strength and homogeneous sliding in metallic glass: exactly solvable model

Special non-CSL grain boundaries in tungsten: Misorientation distribution and energetics

Atomic Mechanisms Governing Strength of Metallic Nanosized Crystals

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