Mutual interaction of shear bands in metallic glasses

Wang, D.P.; Sun, Baoan; Niu, Xinrui; Yang, Yong; Wang, W.H.; Liu, C.T.

doi:10.1016/j.intermet.2017.01.015

Cited by 26 publications

(2 citation statements)

References 49 publications

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“…The stress concentrations appearing around the inclusions perturbates the shear bands in different ways: the main shear band tends to detour or to be blocked and the formation of multiple shear bands is highly favored [35][36][37][38][39][40]. These mechanisms, extensively observed in BMG, are well known to delay the catastrophic fracture and to improve their ductility [41][42][43][44][45][46][47][48][49][50] as well as their toughness [21,27,51]. Chu et al [39,40], who worked on the Zr 55 Cu 30 Al 10 Ni 5 composition, observed that a glass including ductile non-spherical TiNb crystals was much more prone to ductility than another one containing harder oxide particles, and thus highlighted the significant influence of the inclusion yield strength on both ductility and fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

Crystalline defects in bulk metallic glasses: consequences on fracture toughness determination and ductility

Bernard¹,

Kéryvin²

2020

J. Phys.: Condens. Matter

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Dating back to the late 1980s, bulk metallic glasses (BMGs) are relatively new materials that exhibit exceptional mechanical properties (strength, hardness, fracture toughness, stored elastic energy …), compared to those of most crystalline metallic alloys. Their apparent brittleness under uniaxial loading, however, is still a major obstacle to their industrialization. Moreover, BMGs often contain crystalline defects developed, intentionally or not, during their complex and delicate elaboration. These flaws are known to affect their fracture toughness and their plastic behavior. This paper reviews twenty years of works about this subject on Zr-based BMGs that may contain a low volume fraction of crystalline defects of different natures, e.g. dendrites or spherulites, depending on the synthesis method. Dedicated experimental set-ups, mainly bending tests on notched beams, were developed to create in the specimen a proper pre-crack by fatigue and then load it monotonically up to fracture. The measured fracture toughness and the fractographic observations allow to conclude that these crystalline defects facilitate pre-cracking, but result in an embrittlement that is more or less significant depending on their type. The loading mode of the crack — mode I, II or mixed — as well as the temperature were shown to play a key role in crack initiation and propagation, whether steadily or catastrophically, in the BMG. By means of finite element computations analyses, explanations on how the crystalline flaws presence can affect fracture toughness and perturbate crack growth, under mode I and mode II, were proposed. Finally, the relevance of these experimental techniques as well as the link between crystalline defects, fracture toughness and their consequences on the ductility of a structural component are discussed.

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Section: Introductionmentioning

confidence: 99%

Crystalline defects in bulk metallic glasses: consequences on fracture toughness determination and ductility

Bernard¹,

Kéryvin²

2020

J. Phys.: Condens. Matter

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“…It is well accepted that the plastic deformation of bulk metallic glasses (BMGs) is accommodated by shear banding [1][2][3][4][5][6]. The multiplication and intersection of shear bands contribute to a stable deformation manner [7,8]. However, the catastrophic failure also originates from shear instability within shear bands [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the rate effect on deformation mode in ductile and brittle bulk metallic glasses

Zhou

Hou

et al. 2018

Intermetallics

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A B S T R A C TThe rate effect on the deformation mode of bulk metallic glasses (BMGs) is investigated by a comparative study between ductile and brittle compositions via real-time photographing. The strain-rate controls the deformation mode transition from shear-dominated sliding under quasi-static compression to cracking-dominated fracture under dynamic compression. In ductile BMGs, progressive sliding occurs at lower strain rate and contributes to a stable deformation manner. In brittle BMGs, however, unstable deformation occurs through rapid sliding even under quasi-static compression. Both ductile and brittle BMGs undergo unstable deformation under dynamic compression. The rate-dependent and composition-dependent tendency of stable or unstable deformation is well characterized by a model based on the ratio of the applied strain energy to the critical dissipation energy at the local shear banding region.

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Crack and Shear Band Interaction in Bulk Metallic Glasses

Zhou

Hou

et al. 2019

Lecture Notes in Electrical Engineering

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Mutual interaction of shear bands in metallic glasses

Cited by 26 publications

References 49 publications

Crystalline defects in bulk metallic glasses: consequences on fracture toughness determination and ductility

Crystalline defects in bulk metallic glasses: consequences on fracture toughness determination and ductility

A comparative study of the rate effect on deformation mode in ductile and brittle bulk metallic glasses

Crack and Shear Band Interaction in Bulk Metallic Glasses

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