Shear delocalization and crack blunting of a metallic glass containing nanoparticles: In situ deformation in TEM analysis

Hajlaoui, K.; Yavari, A.R.; Doisneau, B.; LeMoulec, A.; F., W.J. Botta; Vaughan, Gavin; Greer, A.L.; Inoue, Akihisa; Zhang, W.; Kvick, Å.

doi:10.1016/j.scriptamat.2006.02.030

Cited by 115 publications

(93 citation statements)

References 24 publications

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“…A 'stress induced displacive transformation' occurs in the 'austenite-like' crystalline clusters, which releases the stress concentration around STZs and restricts free volume accumulation. 5) Spreading of such events in the undeformed regions close to the shear bands allows them to grow and leads to 'thickening' 33) from 5 nm to 25 nm. The rapid propagation of the shear bands in a spatially inhomogeneous glassy structure is hindered due to the 'phase transition', which leads to locally different shear rates 34) in the shear bands and they propagate in a slither mode.…”

Section: Resultsmentioning

confidence: 99%

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Das¹,

Kim

Xu³

et al. 2006

Mater. Trans.

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We report ductile bulk metallic glasses based on martensitic alloys. The slowly cooled specimens contain a mixture of parent 'austenite' and martensite phase. The slightly faster cooled bulk metallic glasses with 2-5 nm sized 'austenite'-like crystalline cluster reveal high strength and large ductility (16%). Shear bands propagate in a slither mode in this spatially inhomogeneous glassy structure and undergo considerable 'thickening' from 5-25 nm. A 'stress induced displacive transformation' is proposed to be responsible for both plasticity and work-hardeninglike behavior of these 'M-Glasses'.

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Section: Resultsmentioning

confidence: 99%

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Das¹,

Kim

Xu³

et al. 2006

Mater. Trans.

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“…Plastic deformation in metallic glasses has been performed using the in-situ TEM technique [123][124][125]. After initial observation, the beam current was reduced and the sample deformed in a straining holder in tension.…”

Section: In Situ Room-temperature Tensile Deformation In Temmentioning

confidence: 99%

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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“…Several intrinsic and extrinsic factors have been suggested to cause the arrest of the shear banding operation. We have experimentally established that the in situ nanocrystallization within the shear bands can offer a "self-locking effect" and increases the strength of shear regions preventing further propagation of shear bands [10][11][12]. Few authors have considered a type of relaxation mechanism able to increase the resistance to the shear bands motion [13].…”

Section: Introductionmentioning

confidence: 99%

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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Shear delocalization and crack blunting of a metallic glass containing nanoparticles: In situ deformation in TEM analysis

Cited by 115 publications

References 24 publications

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

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

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