Correlation between the enhanced plasticity of glassy matrix composites and the intrinsic mechanical property of reinforcement

Chu, Zhenhua; Kato, Hidemi; Xie, Guohua; Lu, Canhui; Ding, Wei

doi:10.1016/j.msea.2012.08.118

Cited by 19 publications

(2 citation statements)

References 28 publications

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“…General trends can still be identified from several works dealing with Zr-based BMGs. 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].…”

Section: Introductionmentioning

confidence: 99%

“…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. More generally, literature reports that oxygen-containing phases lead to a small increase, or at the opposite a drastic reduction of the fracture toughness of these materials [52][53][54].…”

Section: Introductionmentioning

confidence: 99%

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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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