Super Ductility of Nanoglass Aluminium Nitride

Zhao, Yinbo; Peng, Xianghe; Huang, Cheng; Yang, Bo; Hu, Ning; Wang, Mingchao

doi:10.3390/nano9111535

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…It could be also caused by the increased volume fraction of GGIs in NGs with reduced D, and GGIs have much less mechanical strength than conventional MGs. The results are consistent with those reported from molecular dynamics simulation [37,39,[50][51][52][53][54][55].…”

Section: Articlesupporting

confidence: 92%

The effects of glass–glass interfaces on thermodynamic and mechanical properties of Co–Fe–P metallic nano-glasses

Zheng

2021

Journal of Materials Research

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Pulse electrodeposition is utilized to prepare Co-Fe-P metallic nano-glasses (NGs) containing glassy grains with an average size D < 100 nm. The effects of glass-glass interfaces (GGIs) on thermodynamic and mechanical properties of NGs are systematically studied. The glass transitions in NGs as characterized by differential scanning calorimetry and dynamic mechanical analysis show that they are strongly affected by D or the volume fraction of GGIs. In comparison with those for conventional metallic glasses, a predominant internal-friction peak corresponding to the glass transition is observed for NGs with reduced D, suggesting that the GGIs are in a glassy state much different with that of glassy grains in NGs. Nanoindentation measurements on the hardness and volume of shear transformation zones reveal that the GGIs could accommodate plastic strains in NGs, where homogeneous plastic deformation occurs.

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Section: Articlesupporting

confidence: 92%

The effects of glass–glass interfaces on thermodynamic and mechanical properties of Co–Fe–P metallic nano-glasses

Zheng

2021

Journal of Materials Research

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“…In addition to experimental studies, molecular dynamics simulations have also been conducted to investigate the underlying deformation mechanisms of nanoglass with high plasticity [ 23 , 41 , 47 , 49 ]. For instance, Adibi et al [ 47 ] studied the grain size-dependent Cu 50 Zr 50 nanoglass with grain sizes varying from 15 to 5 nm by molecular dynamic simulations.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Dai,

Zhang,

et al. 2024

Nanomaterials

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Extensive research has shown that nanolayered structures are capable of suppressing the shear banding in metallic glass in nanoindentation experiments. However, the specific mode and mechanism of the shear banding underneath the indenter remains unknown. Also, the quantification of shear banding-induced strain localization is still a challenge. Herein, the size-dependent shear banding behavior of a CuTiZrNb high-entropy alloy-based nanolayered glass with individual layer thicknesses (h) ranging from 5 to 80 nm was systematically investigated by nanoindentation tests. It was found that the hardness of the designed structure was almost size-independent. Yet, a clear transition in the deformation modes from the cutting-like shear bands to the kinking-like ones was discovered as h decreased to 10 nm. Moreover, multiple secondary shear bands also appeared, in addition to the primary ones, in the sample with h = 10 nm. The transition leads to an obvious strain delocalization, as clearly illustrated by the proposed theoretical model, which is based on the assumption of a pure shear stress state to quantify the shear banding-induced strain localization. The strain delocalization results from the higher density of amorphous/amorphous interfaces that exhibit the change in morphology with a refined layered glass structure.

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Atomistic Simulation on the Mechanical Properties of Diffusion Bonded Zr-Cu Metallic Glasses with Oxidized Interfaces

Zheng

2021

Metall Mater Trans A

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A novel welding technique of diffusion bonding for Zr-Cu metallic glass with pre-oxidized surfaces is proposed in this study, which is systematically investigated by molecular dynamics (MD) simulation. Compared with the conventional welding technique, the diffusion bonding process can be well implemented below the crystallization temperature of metallic glass. The obtained structure possesses glass-glass interfaces (GGIs) similar with those in nano-glasses.As revealed by MD simulation, the diffusion bonded metallic glasses possess enhanced mechanical strength and ductility that generally do not exist in nano-glasses and their bulk metallic glass counterparts. The GGIs are found to hinder the propagation of shear bands, where there is strong bonding between Zr and O and the segregated Cu and ZrO2 clusters could induce extra plasticity. The results demonstrate that the diffusion bonding of metallic glass with preoxidized surfaces could provide an alternative approach in solving the longstanding issue of size limitation on metallic glasses. I. INTRODUCTIONAmorphous alloys, also known as metallic glasses (MGs), possess outstanding mechanical properties including high mechanical strength and excellent corrosion resistance, and are promising for structural applications [1]-[2]. Even though different MGs with a variety of compositions have been fabricated in the past decades, the MGs are still not large enough in physical dimensions (< 10 cm) due to the fast quenching rate required for suppressing crystallization. Meanwhile, conventional welding technique cannot be applied to MGs due to high temperature profiles at heat affected zone (HAZ) that might induce crystallization. The mechanical properties of MG might be greatly deteriorated if low-temperature (< 500 o C) solders are used in the welding process. Therefore, to overcome the size limitation on MGs, other welding techniques for MGs should be further investigated and developed. By far, only a few studies have been reported, demonstrating the feasibility of friction, electron-beam, spark, pulse-current and explosive jointing techniques in wedding MGs [3]-[7]. However, those alternative approaches are not suitable for massive manufacturing and the processing parameters must be precisely controlled. Moreover, the mechanical performances of MGs welded by those approaches are at best compatible to those of as-prepared MGs. Recently, a novel type of nanomaterial, named as nano-glass, has been successfully prepared, which consists of numerous glass-glass interfaces (GGI) connecting different nanosized MG clusters or particles [8]-[11]. It is mainly synthesized by inert gas condensation, magnetron sputtering, serve plastic deformations and electrodeposition. Among these techniques, inert gas condensation is the most commonly used one, which produces nanoglasses by compacting nano-sized MG clusters under high external pressure (>100 MPa) and This is the Pre-Published Version.

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Super Ductility of Nanoglass Aluminium Nitride

Cited by 6 publications

References 45 publications

The effects of glass–glass interfaces on thermodynamic and mechanical properties of Co–Fe–P metallic nano-glasses

The effects of glass–glass interfaces on thermodynamic and mechanical properties of Co–Fe–P metallic nano-glasses

Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Atomistic Simulation on the Mechanical Properties of Diffusion Bonded Zr-Cu Metallic Glasses with Oxidized Interfaces

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