Journal ArticleDOI
A simple, mixtures-based model for the grain size dependence of strength in nanophase metals
TLDR
In this paper, a model for the strength of nanophase metals is presented, which assumes that polycrystalline metals consist of two phases: the bulk intragranular regions and the grain boundaries.About:
This article is published in Nanostructured Materials.The article was published on 1995-05-01. It has received 152 citations till now. The article focuses on the topics: Grain boundary strengthening & Grain boundary.read more
Citations
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A Maximum in the Strength of Nanocrystalline Copper
TL;DR: Using molecular dynamics simulations with system sizes up to 100 million atoms to simulate plastic deformation of nanocrystalline copper, it is shown that the flow stress and thus the strength exhibit a maximum at a grain size of 10 to 15 nanometers.
Journal ArticleDOI
The search for novel, superhard materials
TL;DR: The recent development in the field of superhard materials with Vickers hardness of ⩾40 GPa is reviewed in this article, where two basic approaches are outlined including the intrinsic superhard material, such as diamond, cubic boron nitride, C3N4, carbonitrides, etc. and extrinsic, nanostructured materials for which superhardness is achieved by an appropriate design of their microstructure.
Journal ArticleDOI
Different approaches to superhard coatings and nanocomposites
TL;DR: In this paper, different approaches to the preparation of superhard coatings such as intrinsically superhard materials, coatings whose hardness is enhanced by energetic ion bombardment during deposition, and nanostructured super-hard materials are discussed with the emphasis on the question of how to distinguish between the different mechanisms of hardness enhancement in thin coatings.
Journal ArticleDOI
Some critical experiments on the strain-rate sensitivity of nanocrystalline nickel
TL;DR: In this paper, a simple computational model, predicated on the assumption that a rate-sensitive grain boundary affected zone exists, is shown to explain the observed effect of grain size on the rate-dependent plastic response.
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Six decades of the Hall–Petch effect – a survey of grain-size strengthening studies on pure metals
TL;DR: In this paper, the authors gather the grain-size strengthening data from the Hall-Petch studies on pure metals and use this aggregated data to calculate best estimates of these metals' Hall-petch parameters.
References
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Book
The Hardness of Metals
TL;DR: Hardness measurements with conical and pyramidal indenters as mentioned in this paper have been used to measure the area of contact between solids and the hardness of ideal plastic metals. But they have not yet been applied to the case of spherical indenters.
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The deformation of plastically non-homogeneous materials
TL;DR: The geometrically necessary dislocations as discussed by the authors were introduced to distinguish them from the statistically storages in pure crystals during straining and are responsible for the normal 3-stage hardening.
Journal ArticleDOI
On the validity of the hall-petch relationship in nanocrystalline materials
TL;DR: In this paper, a study experimentale de la variation de la durete en fonction de la grosseur de grain for des materiaux nanocristallins is presented.
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The relation between polycrystal deformation and single-crystal deformation
TL;DR: In this paper, a phenomenological description of crystallographic slip and pencil glide in single crystals is outlined, with emphasis on the behavior under prescribed strains Theoretical relations are established between these single-crystal properties and the behavior of quasi-homogeneous, quasi-isotropic polycrystals deforming uniformly on a macroscopic scale, at subdiffusive temperatures.