Instability of crack propagation in brittle bulk metallic glass

Wang, Guocheng; Chan, Kang Cheung; Xu, Xianghong; Wang, W. H.

doi:10.1016/j.actamat.2008.08.005

Cited by 61 publications

(37 citation statements)

References 55 publications

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“…Their exact formation mechanism has been intensely debated. Earlier work [40] explained the features in terms of an FMI mechanism, similar to the vein patterns discussed above. The material at the crack tip is at a temperature close to the glass transition (Tg) and the crack tip acts as a fluid meniscus showing perturbations.…”

Section: Toughness From Fracture Surfacesmentioning

confidence: 78%

“…Under the action of a stress gradient, perturbations with a critical wavelength will grow into the material ahead of the crack tip, in the process creating a new crack tip with a viscous zone ahead of it. The process repeats, leading to the formation of nanoscale corrugations (NCs) [38,40]. Others, however, hold different views and it has been asserted that FMI is unlikely to play a role in NC formation [38,41].…”

Section: Toughness From Fracture Surfacesmentioning

confidence: 99%

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Toughness of Bulk Metallic Glasses

Madge

2015

Metals

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Bulk metallic glasses (BMGs) have desirable properties like high strength and low modulus, but their toughness can show much variation, depending on the kind of test as well as alloy chemistry. This article reviews the type of toughness tests commonly performed and the factors influencing the data obtained. It appears that even the less-tough metallic glasses are tougher than oxide glasses. The current theories describing the links between toughness and material parameters, including elastic constants and alloy chemistry (ordering in the glass), are discussed. Based on the current literature, a few important issues for further work are identified.

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Section: Toughness From Fracture Surfacesmentioning

confidence: 78%

Section: Toughness From Fracture Surfacesmentioning

confidence: 99%

Toughness of Bulk Metallic Glasses

Madge

2015

Metals

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“…Thus, the V R value is a constant. When the crack propagation commences, the K I value decreases with dynamic crack propagation, and V increases with crack propagation [34,38], suggesting that the Γ value decreases with crack propagation. In this case, the necessary energy for supporting the crack running is reduced.…”

Section: Discussionmentioning

confidence: 99%

“…Accordingly, the 1/σ 2 value increases approximately 44.5 times with decreasing temperature. For the r H value, the hyperelastic region is associated with the plastic process zone [34,35], i.e., depending on the size of the plastic process zone, R (R = 1 6π…”

Section: Discussionmentioning

confidence: 99%

Reduced Fracture Toughness of Metallic Glass at Cryogenic Temperature

Zhou

Liu

Han

et al. 2017

Metals

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Abstract:The effects of cryogenic temperature on the toughness of a Zr-based metallic glass are investigated. Based on three-dimensional fracture morphologies at different temperatures, the crack formation and propagation are analyzed. Through the calculation of the shear transformation zone volume, the shear modulus and bulk modulus of the metallic glass at different temperatures and the crack formation mechanism associated with the temperature is discussed. Once the crack commences propagation, the hyperelasticity model is used to elucidate the fractographic evolution of crack propagation.

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“…On the other hand, fractographs of brittle MGs show misty-mirror morphology (Wang et al, 2008;Xia and Wang, 2012). The mirror zones reveal periodic nano-corrugations under high resolution scanning electron microscopy (Wang et al, 2007(Wang et al, , 2009.…”

Section: Introductionmentioning

confidence: 98%

Cavitation in brittle metallic glasses – Effects of stress state and distributed weak zones

Singh

Guo²,

Narasimhan

et al. 2014

International Journal of Solids and Structures

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a b s t r a c tExperimental studies and atomistic simulations have shown that brittle metallic glasses fail by a cavitation mechanism whose origin has been traced to the presence of intrinsic atomic density fluctuations which give rise to weak zones with reduced yield strength. It has been shown recently through continuum analysis that the presence of these zones can lower the cavitation stress considerably under equibiaxial loading. The objective of the present work is to study the effect of the applied stress state on the cavitation behavior of such a heterogeneous plastic solid with distributed weak zones. To this end, 2D plane strain finite element simulations are performed by subjecting a unit cell containing a weak zone to different (biaxiality) stress ratios. The volume fraction and yield strength of the weak zone are varied over a wide range. The results show that unlike in a homogeneous plastic solid, the cavitation stress of the heterogeneous aggregate does not reduce appreciably as the stress ratio decreases from unity when the yield strength of the weak zone is low. It is found that a non-dimensional parameter characterizing the stress state prevailing in the weak zone and its yield properties uniquely control the cavitation stress. The nature of cavitation bifurcation may change from unstable bifurcation to the left at sufficiently low stress ratio to one involving snap cavitation at high stress ratio.

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Instability of crack propagation in brittle bulk metallic glass

Cited by 61 publications

References 55 publications

Toughness of Bulk Metallic Glasses

Toughness of Bulk Metallic Glasses

Reduced Fracture Toughness of Metallic Glass at Cryogenic Temperature

Cavitation in brittle metallic glasses – Effects of stress state and distributed weak zones

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