Journal ArticleDOI
Short-range-order effects on intrinsic plasticity of metallic glasses
Minqiang Jiang,Lanhong Dai +1 more
TLDR
In this article, the elastic moduli for 137 metallic glasses (MGs) and 56 polycrystalline metals were analyzed through a simple model developed by Knuyt et al. based on a Gaussian distribution for the first-neighbor distance to reveal the short-range-order structural conditions for plasticity of MGs.Abstract:
Through a systematical analysis of the elastic moduli for 137 metallic glasses (MGs) and 56 polycrystalline metals, we use a simple model developed by Knuyt et al. [J. Phys. F: Met. Phys. 16 (1986) p.1989; Phil. Mag. B 64 (1991) p.299] based on a Gaussian distribution for the first-neighbor distance to reveal the short-range-order (SRO) structural conditions for plasticity of MGs. It is found that the SRO structure with dense atomic packing, large packing dispersion and a significant anharmonicity of atomic interaction within an MG is favorable for its global plasticity. Although these conditions seem paradoxical, their perfect matching is believed to be a key for designing large plastic bulk MGs not only in compression but also in tension.read more
Citations
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Journal ArticleDOI
Poisson's ratio and modern materials
TL;DR: On the bicentenary of the publication of Poisson's Traité de Mécanique, the continuing relevance of Poissons's ratio in the understanding of the mechanical characteristics of modern materials is reviewed.
Journal ArticleDOI
Seeing auxetic materials from the mechanics point of view: A structural review on the negative Poisson’s ratio
TL;DR: In this paper, the authors summarized research work related to materials with zero, or negative Poisson's ratio, referred to as auxetic materials, and predicted that future research will be in the direction of disordered microstructures utilizing the homogenization method.
Journal ArticleDOI
Metallic glass matrix composites
TL;DR: In this article, the development, fabrication, microstructures, and properties of MGMCs, including the room-temperature, cryogenictemperature and hightemperature mechanical properties upon quasi-static and dynamic loadings are reviewed.
Journal ArticleDOI
Intrinsic ductility of glassy solids
TL;DR: In this paper, molecular dynamics simulations on three families of glasses (metallic glasses, amorphous silicon, and silica) with controlled bonding, processing, and testing conditions, show that glasses with low covalency and high structural disorder have high v and ductility, and vice versa.
Journal ArticleDOI
Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses
Minqiang Jiang,Minqiang Jiang,Gerhard Wilde,Jikun Chen,C.B. Qu,Shao-Yun Fu,Feng Jiang,Lanhong Dai +7 more
TL;DR: In this article, a Zr-based bulk metallic glass under quasi-static uniaxial tension can fracture via cavitation, rather than by shear banding, showing a transition from shear-to dilatation-dominated failure.
References
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Journal ArticleDOI
XCII. Relations between the elastic moduli and the plastic properties of polycrystalline pure metals
TL;DR: In this paper, the elastic and plastic properties of pure polycrystalline metals are discussed and a systematic relation between shear modulus, Burgers vector and plastic shear strength of metals possessing the same lattice structure is proposed.
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A quantitative demonstration of the grain boundary diffusion mechanism for the oxidation of metals
TL;DR: In this article, the authors report measurements of the oxide scale thickness and oxide grain size as a function of time during the oxidation of high-purity nickel in the temperature range 500-800°C.
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Atomic packing and short-to-medium-range order in metallic glasses
TL;DR: This work uses a combination of state-of-the-art experimental and computational techniques to resolve the atomic-level structure of amorphous alloys and elucidate the different types of short-range order as well as the nature of the medium- range order.
Journal ArticleDOI
Ductile versus brittle behaviour of crystals
James R. Rice,Robb Thomson +1 more
TL;DR: In this article, a necessary criterion for brittle fracture in crystals is established, in terms of the spontaneous emission of dislocations from an atomically sharp cleavage crack, and the stability of a sharp crack against emission of a blunting dislocation for a number of crystals and crystal types in two dimensions and the energy to form a stable loop of dislocation from the crack tip in three dimensions.