The Duality of Fracture Behavior in a Ca-based Bulk-Metallic Glass

Wang, Gongyao; Liaw, Peter K.; Senkov, O.N.; Miracle, D.B.

doi:10.1007/s11661-010-0533-7

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…In some Fe-based, Ca-based, Mg-based, Rare earth-based and other brittle MGs, the fracture mode under compression/tension loading can change from shear mode (fracture along the shear band path, which is~45 • from the loading axis) to cleavage mode (fracture along the plane perpendicular to the applied stress), split mode [45] (fracture along the plane parallel to the applied stress) or fragmentation mode. The cleavage or split surface of these brittle MGs can be divided into mirror, mist, and hackle regions [41,46]. The cleavage surface of MGs is smooth and continuous, with many radial ridge patterns along the crack propagation direction [47].…”

Section: Brittle Fracture Of Mgsmentioning

confidence: 99%

“…(fracture along the plane perpendicular to the applied stress), split mode [45] (fracture along the plane parallel to the applied stress) or fragmentation mode. The cleavage or split surface of these brittle MGs can be divided into mirror, mist, and hackle regions [41,46]. The cleavage surface of MGs is smooth and continuous, with many radial ridge patterns along the crack propagation direction [47].…”

mentioning

confidence: 99%

“…The cleavage surface of MGs is smooth and continuous, with many radial ridge patterns along the crack propagation direction [47]. The split or fragment surface of MGs consists of many smooth conchoidal morphologies [46]. Plentiful periodic nanoscale wavy corrugations can be observed on the enlarged fracture surface (Figure . 3).…”

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confidence: 99%

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Understanding the Fracture Behaviors of Metallic Glasses—An Overview

2019

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Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered.

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Section: Brittle Fracture Of Mgsmentioning

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Understanding the Fracture Behaviors of Metallic Glasses—An Overview

2019

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Reversible Room Temperature Brittle‐Plastic Transition in Ag₂Te_0.6S_0.4 Inorganic Thermoelectric Semiconductor

Wang

et al. 2023

Adv Funct Materials

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Inorganic semiconductors with superior plasticity are highly desired in current flexible electronics, which however are rarely discovered owing to their intrinsic covalent and ionic bonds. The Ag 2 Te 0.6 S 0.4 semiconductor with an amorphous phase has recently been reported to exhibit plastic deformability. In this study, the reversible brittle-plastic transition is found in this inorganic semiconductor, and the plasticity of the Ag 2 Te 0.6 S 0.4 sample is highly related to the phase structures. The Ag 2 Te 0.6 S 0.4 with a monoclinic phase exhibits a brittle behavior, while the one with cubic-crystalline/amorphous structure shows exceptional plasticity with a compressive strain of over 80%. Significantly, the reversible plastic-brittle transition in Ag 2 Te 0.6 S 0.4 inorganic semiconductor can be achieved by simple heat treatment. Besides the plasticity, the cubic-crystalline/amorphous Ag 2 Te 0.6 S 0.4 composites also possess good thermoelectric performance. This study uncovers the influence of phase structure on the mechanical properties of Ag 2 Te 0.6 S 0.4 and realizes the reversible brittle-plastic transition, facilitating its prospective application in flexible/wearable electronics.

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