Metallic glasses: Notch-insensitive materials

Qu, R.T.; Calin, Mariana; Eckert, J.; Zhang, Z.F.

doi:10.1016/j.scriptamat.2012.01.044

Cited by 74 publications

(58 citation statements)

References 22 publications

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“…This finding can be used to explain the work-hardening phenomenon observed in some ductile MGs under compression [41,46,80], or in tensile deformation of a surface treated or notched MG [77,81], or in MGs under bending [14]. Due to the stress gradient, shear bands in bended MGs are usually initiated from the two side faces of the sample, and then progressively propagate toward the neutral plane with zero stress.…”

Section: Implication For Understanding the Plasticitymentioning

confidence: 90%

“…It has been found that the corresponding stress-strain response for the propagation of bending shear bands also exhibits an apparent work-hardening behavior [14]. By pulling BMG samples containing notches or surface impressions, macroscopic tensile plasticity with apparent work-hardening behavior instead of catastrophic fracture has been observed by Qu and co-workers [77,81]. Similar to bending, the stress concentration and stress gradient around notches and surface impressions promote the initiation of shear bands but impede their progressive propagation to fully transect the sample, giving rise to many inserting shear bands contributing to tensile plasticity and work-hardening.…”

Section: Implication For Understanding the Plasticitymentioning

confidence: 97%

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Progressive shear band propagation in metallic glasses under compression

et al. 2015

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Section: Implication For Understanding the Plasticitymentioning

confidence: 90%

Section: Implication For Understanding the Plasticitymentioning

confidence: 97%

Progressive shear band propagation in metallic glasses under compression

et al. 2015

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“…The net strength r n net is the average fracture stress on the net cross section, which can be expressed as r n net ¼ P ðWÀhÞt , where P is the ultimate load, and W, h, and t are the width, notch depth, and thickness of the specimen, respectively. Using the NSR index, the effect of the notches on the tensile strength of the engineering materials can be classified into three kinds [22]: notch strengthening materials when NSR [ 1, notch weakening materials when NSR \ 1, and notch insensitivity materials when NSR = 1.…”

Section: Resultsmentioning

confidence: 99%

Carbon–Carbon Composites

Balasubramanian¹

2013

Composite Materials and Processing

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Carbon fiber reinforced carbon matrix composites (C/Cs), as important candidate aviation and aerospace materials, have good prospects for application in extreme environments. However, notch effects of C/Cs have not been studied adequately. In this work, the notch effects of 3D-C/C composites were investigated by the full-field measurement digital image correlation method. Six kinds of specimens with different notch patterns including one central hole, multiholes, and double edge notches, were examined to analyze their mechanical properties. The tests were carried out on MTS 809 testing machine and the deformations of specimens were monitored by a CCD camera. Using the full-field measurement, both the local mechanical properties (stress concentration, shear damage, and fracture behavior) and the globe properties (notch sensitivity and tensile behavior) were studied. The results indicated that the fracture stress on the net cross section was constant and it was independent on the material heterogeneity, notch patterns, and notch depth.

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“…However, in the constrained stress field such as compression and bending, considerable plastic in BMGs can be achieved by multiple shear bands [10e14]. Based on this mechanism, substantial efforts have been made to enhance the tensile ductility of MGs, such as introducing heterostructures [15], notching [16,17], surface treatment [18,19] and cold working [20]. Nevertheless, the flow is still constrained in shear band and the ductility is also carried by multiple shear bands.…”

Section: Introductionmentioning

confidence: 99%

Enhanced tensile plasticity of Zr based bulk metallic glasses by a stress induced large scale flow

Dong

Gao

Huan

et al. 2017

Journal of Alloys and Compounds

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a b s t r a c tTensile plasticity in a Zr-based bulk metallic glasses is achieved through a stress induced large-scale flow. The large-scale flow is activated in a complex stress field which is produced by introducing micro-pits array on specimen surfaces using a laser engraving technique. A flame-like fracture morphology with bigger size (about 10 mm in height) is observed on the fracture surface of specimen, indicating that the size of flow here is far beyond the size of that induced by shear bands. Theoretical analysis accompanied with finite elements modeling (FEM) reveal that the form of high shear zones agrees well with that of the large-scale flow, suggesting that the flow form is changed by the complex stress field. After a comprehensive analyze, the intense shear and suppressing shear bands are concluded to be the two necessary conditions for the stress induced large scale flow.

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Metallic glasses: Notch-insensitive materials

Cited by 74 publications

References 22 publications

Progressive shear band propagation in metallic glasses under compression

Progressive shear band propagation in metallic glasses under compression

Carbon–Carbon Composites

Enhanced tensile plasticity of Zr based bulk metallic glasses by a stress induced large scale flow

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