Journal ArticleDOI
Mechanical behavior of nanocrystalline metals and alloys
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TLDR
In this article, the authors present an overview of the mechanical properties of nanocrystalline metals and alloys with the objective of assessing recent advances in the experimental and computational studies of deformation, damage evolution, fracture and fatigue, and highlighting opportunities for further research.About:
This article is published in Acta Materialia.The article was published on 2003-11-25. It has received 1811 citations till now. The article focuses on the topics: Superplasticity & Characterization (materials science).read more
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Mechanical properties of nanocrystalline materials
TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.
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Hall-Petch relation and boundary strengthening
TL;DR: In this article, the Hall-Petch relation is discussed separately for the yield stress of polycrystalline metals and for the flow stress of deformed metals for a grain size range from about 20 nm to hundreds of micrometers.
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Strengthening Materials by Engineering Coherent Internal Boundaries at the Nanoscale
TL;DR: An approach to optimize strength and ductility is outlined by identifying three essential structural characteristics for boundaries: coherency with surrounding matrix, thermal and mechanical stability, and smallest feature size finer than 100 nanometers.
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Ab initio calculation of ideal strength and phonon instability of graphene under tension
Fang Liu,Pingbing Ming,Ju Li +2 more
TL;DR: In this paper, the phonon spectra of graphene were calculated as a function of uniaxial tension by density functional perturbation theory to assess the first occurrence of phonon instability on the strain path.
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Super Plastic Bulk Metallic Glasses at Room Temperature
TL;DR: Microstructures analysis indicates that the super plastic bulk metallic glasses are composed of hard regions surrounded by soft regions, which enable the glasses to undergo true strain of more than 160%, suggestive of a solution to the problem of brittleness in, metallic glasses.
References
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Journal ArticleDOI
Bulk nanostructured materials from severe plastic deformation
TL;DR: In this article, the authors present methods of severe plastic deformation and formation of nanostructures, including Torsion straining under high pressure, ECA pressing, and multiple forging.
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Fatigue of materials
TL;DR: In this article, the cyclic deformation and fatigue crack initiation in polycrystalline ductile solids was studied and a total-life approach was proposed to deal with the problem.
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Nanostructured materials: basic concepts and microstructure☆
TL;DR: In this article, the authors summarize the basic physical concepts and the microstructural features of equilibrium and non-equilibrium nanostructured materials (NsM) and make an attempt to summarize their properties.
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Molecular dynamics study of melting and freezing of small Lennard-Jones clusters
TL;DR: In this paper, the properties of small clusters of Lennard-Jones atoms were studied by using molecular dynamics simulations, and it was found that these clusters undergo a transition, analogous to a melting transition for bulk materials, from a low-energy solidlike structure at low temperatures to a set of higher energy liquidlike structures at high temperatures.
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A highly processable metallic glass: Zr41.2Ti13.8Cu12.5Ni10.0Be22.5
Atakan Peker,William L. Johnson +1 more
TL;DR: In this article, the properties of a new family of metallic alloys which exhibit excellent glass forming ability are reported, where the critical cooling rate to retain the glassy phase is of the order of 10 K/s or less.