Ductile to brittle transition of fracture of a Zr-based bulk metallic glass: Strain rate effect

Li, Mingcan; Jiang, Minqiang; Li, Guang; He, Linchun; Sun, Jun; Jiang, F.

doi:10.1016/j.intermet.2016.07.004

Cited by 29 publications

(13 citation statements)

References 65 publications

(45 reference statements)

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“…The ultimate stress (or the yield stress) is closely related to the activation of the STZs. The available free volume (the free volume which is mobile [45]) decreases with the increase of the ε˙, ascribed to the less time for atoms to diffuse and for the free volume to be rearranged. The fewer available free volume implies that the activation of STZ needs higher stress, leading to strain rate hardening effect [46].…”

Section: Resultsmentioning

confidence: 99%

Super Ductility of Nanoglass Aluminium Nitride

et al. 2019

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Ceramics have been widely used in many fields because of their distinctive properties, however, brittle fracture usually limits their application. To solve this problem, nanoglass ceramics were developed. In this article, we numerically investigated the mechanical properties of nanoglass aluminium nitride (ng-AlN) with different glassy grain sizes under tension using molecular dynamics simulations. It was found that ng-AlN exhibits super ductility and tends to deform uniformly without the formation of voids as the glassy grain size decreases to about 1 nm, which was attributed to a large number of uniformly distributed shear transformation zones (STZs). We further investigated the effects of temperature and strain rate on ng-AlNd = 1 nm, which showed that temperature insignificantly influences the elastic modulus, while the dependence of the ultimate strength on temperature follows the T2/3 scaling law. Meanwhile, the ultimate strength of ng-AlNd = 1 nm is positively correlated with the strain rate, following a power function relationship.

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Section: Resultsmentioning

confidence: 99%

Super Ductility of Nanoglass Aluminium Nitride

et al. 2019

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“…2. (2) and (3), we can see that the deformation of Vit 105 under dynamic cases is still governed by STZs [3,44,49]. In other words, there is still a free volume softening.…”

Section: MC Li Et Al Materials Science and Engineering A 680 (2017) mentioning

confidence: 94%

“…, the amount of the available free volume, which is defined as the free volume that can be mobile [43,44], will be relatively large due to the sufficient time for the diffusion of the atoms and the rearrangements of the free volume. This is in good agreement with the regular fracture angles and the smooth fracture surfaces shown in Figs.…”

Section: MC Li Et Al Materials Science and Engineering A 680 (2017) mentioning

confidence: 99%

Effect of strain rate on yielding strength of a Zr-based bulk metallic glass

Jiang

Yang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TUniaxial tension and compression experiments were performed on a typical Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit 105) bulk metallic glass over a wide range of strain rates at room temperature. It is found that the strain rate effect of the yielding strength will change from insensitive to negative with increasing strain rate above a critical value. This phenomenon can be quantitatively described by a modified cooperative-shear model of shear transformation zones that takes the adiabatic temperature rise into account. The model predicts well the present and other experimental data.

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“…In situ micro-tensile experiments Failure processes of metals can be investigated in various ways, the two most common of which are the uniaxial tensile test and the fracture toughness test [25,32,33,34,35]. Here, we chose the former because we want to examine how the dislocation plasticity, i.e., the source-controlled plasticity at the micrometer scale, influences the failure process.…”

Section: Resultsmentioning

confidence: 99%

Low‐temperature failure mechanism of [001] niobium micropillars under uniaxial tension

Song

Aragon

Ryu

et al. 2021

Journal of Materials Research

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The plasticity of body-centered cubic (bcc) metals is dependent of temperature as well as sample dimension at the micrometer scale, but the effects of cryogenic temperature on the plasticity and the related failure process in micron-sized bcc metals have not been studied under uniaxial tension. In this work, we utilized in situ cryogenic micro-tensile tests, transmission electron microscopy, and dislocation dynamic simulations to examine the plasticity and failure processes of [001]-oriented bcc niobium micropillars. Our study reveals that a strong suppression of cross-slip at low temperatures prevents dislocation multiplication and leads to a dislocation starvation state, at which no mobile dislocation exists due to the rapid annihilation of dislocations at free surfaces. New dislocations are then nucleated until stress concentration at a slip step creates a micro-crack, the propagation of which leads to catastrophic failure. This unique failure process results from the combined effects of sample dimension and temperature.

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Ductile to brittle transition of fracture of a Zr-based bulk metallic glass: Strain rate effect

Cited by 29 publications

References 65 publications

Super Ductility of Nanoglass Aluminium Nitride

Super Ductility of Nanoglass Aluminium Nitride

Effect of strain rate on yielding strength of a Zr-based bulk metallic glass

Low‐temperature failure mechanism of [001] niobium micropillars under uniaxial tension

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