Effect of chemical composition on the fracture toughness of bulk metallic glasses

Shao, Liping; Ketkaew, Jittisa; Gong, Pan; Zhao, Shaofan; Sohn, So Young; Bordeenithikasem, Punnathat; Datye, Amit; Mota, Rodrigo Miguel Ojeda; Liu, Naijia; Kube, Sebastian; Liu, Qing; Chen, Wen; Yao, Kefu; Wu, Su Jun; Schroers, Jan

doi:10.1016/j.mtla.2020.100828

Cited by 34 publications

(21 citation statements)

References 82 publications

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“…We find that while a single model's Poisson's ratio ν seems to form a monotonically increasing function with that model's prefactor A g , there is no deep, overarching relation between these observables, as indicated by the huge spread of A g seen at almost all ν values, once different model systems are considered. Similar statements were previously made in [80,81].…”

Section: Glasses' Stz Size Vs Poisson's Ratiosupporting

confidence: 85%

Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions

González-López,

Shivam,

Zheng

et al. 2020

Preprint

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Recent literature indicates that attractive interactions between particles of a dense liquid play a secondary role in determining its bulk mechanical properties. Here we show that, in contrast with their apparent unimportance to the bulk mechanics of dense liquids, attractive interactions can have a major effect on macro-and microscopic elastic properties of glassy solids. We study several broadlyapplicable dimensionless measures of stability and mechanical disorder in simple computer glasses, in which the relative strength of attractive interactions -referred to as particle 'stickiness' -can be readily tuned. We show that increasing particle stickiness can result in the decrease of various quantifiers of mechanical disorder, both on macro-and microscopic scales, with a pair of intriguing exceptions to this rule. Interestingly, in some cases strong attractions can lead to a reduction of the number density of soft, quasilocalized modes, by up to an order of magnitude, and to a substantial decrease in their core size, similar to the effects of thermal annealing on elasticity observed in recent works. Contrary to the behavior of canonical glass models, we provide compelling evidence indicating that the stabilization mechanism in our sticky-sphere glasses stems predominantly from the self-organized depletion of interactions featuring large, negative stiffnesses. Finally, we establish a fundamental link between macroscopic and microscopic quantifiers of mechanical disorder, which we motivate via scaling arguments. Future research directions are discussed.

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Section: Glasses' Stz Size Vs Poisson's Ratiosupporting

confidence: 85%

Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions

González-López,

Shivam,

Zheng

et al. 2020

Preprint

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“…The results show that both anelastic and viscoplastic deformations were much more pronounced in the as-cast sample than in the annealed one [223]; this difference was attributed to the fact that the structurally relaxed glass contained relatively less free volume [229] and hence was more creep resistant. interesting to note here that Shao et al [232], who examined a broad range of 13 BMGs from different alloy systems, found this exact relation to hold. Narayan et al [231] also found an excellent correlation between K Ic and N i , which is the number of shear bands around spherical indentation impressions that are made to predetermined indentation strain of 10%; see Fig.…”

Section: Time-dependent Deformationmentioning

confidence: 52%

Indentation of glasses

Rouxel

Jang

Ramamurty

2021

Progress in Materials Science

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“…Many metallic liquids exhibit low GFA with R C > 10 8 K/s 15 . Others at specific compositions can be undercooled below T g without crystallizing even at <10 3 K/s, allowing for bulk glass formation 16 , 17 . In general, the fragility correlates with many liquid and glass properties, including relaxation, diffusion, and crystallization kinetics 18 – 22 , mechanical properties 23 and elastic constants 24 .…”

Section: Introductionmentioning

confidence: 99%

Compositional dependence of the fragility in metallic glass forming liquids

et al. 2022

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The viscosity and its temperature dependence, the fragility, are key properties of a liquid. A low fragility is believed to promote the formation of metallic glasses. Yet, the fragility remains poorly understood, since experimental data of its compositional dependence are scarce. Here, we introduce the film inflation method (FIM), which measures the fragility of metallic glass forming liquids across wide ranges of composition and glass-forming ability. We determine the fragility for 170 alloys ranging over 25 at.% in Mg–Cu–Y. Within this alloy system, large fragility variations are observed. Contrary to the general understanding, a low fragility does not correlate with high glass-forming ability here. We introduce crystallization complexity as an additional contribution, which can potentially become significant when modeling glass forming ability over many orders of magnitude.

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Effect of chemical composition on the fracture toughness of bulk metallic glasses

Cited by 34 publications

References 82 publications

Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions

Mechanical disorder of sticky-sphere glasses. I. Effect of attractive interactions

Indentation of glasses

Compositional dependence of the fragility in metallic glass forming liquids

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