Propagation of shear bands in metallic glasses and transition from serrated to non-serrated plastic flow at low temperatures

Vinogradov, Alexei; Lazarev, A.; Louzguine-Luzgin, Dmitri V.; Yokoyama, Yoshihiko; Li, S.; Yavari, A.R.; Inoue, Akihisa

doi:10.1016/j.actamat.2010.08.039

Cited by 41 publications

(28 citation statements)

References 31 publications

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“…The mechanical behavior and the kinetics of shear deformation in bulk metallic glassy alloys were also investigated at room and liquid nitrogen temperature using the acoustic emission technique. It was demonstrated that the intensive acoustic emission reflecting the activity of strongly localized shear bands at room temperature vanishes at the transition from serrated to non-serrated plastic flow at LN 2 temperature [112]. The disappearance of acoustic emission signals clearly suggests that the shear band propagation velocity significantly decreases at low temperature likely owing to the increased viscosity of the deforming regions.…”

Section: Deformation Of Bulk Metallic Glasses At Cryogenic Temperaturementioning

confidence: 93%

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Louzguine-Luzgin

Louzguina-Luzgina

Churyumov

2012

Metals

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Metallic glasses demonstrate unique properties, including large elastic limit and high strength, which make them attractive for practical applications. Unlike crystalline alloys, metallic glasses, in general, do not exhibit a strain hardening effect, while plastic deformation at room temperature is localized in narrow shear bands. Room-temperature mechanical properties and deformation behavior of bulk metallic glassy samples and the crystal-glassy composites are reviewed in the present paper.

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Section: Deformation Of Bulk Metallic Glasses At Cryogenic Temperaturementioning

confidence: 93%

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Louzguine-Luzgin

Louzguina-Luzgina

Churyumov

2012

Metals

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“…13 225 at 77 K might also be ascribed to the decrease of the STZ volume due to low temperature, where nano-scaled "chevron" patterns rather than vein patterns on the low temperature fracture surface indicate an apparent decrease in the plasticity [7]. While for other BMGs [49][50][51][52][53][54][55] with both enhancements of yield strength and plasticity under compression when the test temperatures decrease from room temperature to liquid nitrogen temperature (77 K), a lower test temperature might introduce a brittle failure, i.e. ductile-to-brittle transition.…”

Section: Discussionmentioning

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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“…On the other hand, the strengthened materials at low temperature usually behave more brittle. However, very interestingly, it is reported that BMGs at cryogenic temperature show enhanced plasticity in compression [1][2][3][4][5][6][7][8], even in tension [9,10]. Such plasticity improvement was attributed to multiple-nucleation of shear bands at low temperature [1,5,7].…”

Section: Introductionmentioning

confidence: 99%

“…Similar to crystalline alloys, BMGs usually exhibit higher strength with the decrease of the ambient temperature [1][2][3][4][5][6][7][8][9][10]. Its underlying mechanism has been discussed in terms of shear transformation zones (STZs) [1,3,5,[10][11][12].…”

Section: Introductionmentioning

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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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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Propagation of shear bands in metallic glasses and transition from serrated to non-serrated plastic flow at low temperatures

Cited by 41 publications

References 31 publications

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

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

Ambient temperature embrittlement of a Zr-based bulk metallic glass

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