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Twenty-five years of ultrafine-grained materials: achieving exceptional properties through grain refinement
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In this article, an overview of the more recent developments in this field, with special emphasis on the opportunities for achieving homogeneity in the as-processed materials and on the general characteristics of the mechanical properties achieved after SPD processing.About:
This article is published in Acta Materialia.The article was published on 2013-11-01. It has received 614 citations till now.read more
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Generation and healing of porosity in high purity copper by high-pressure torsion
Yuanshen Qi,Anna Kosinova,Askar Kilmametov,Boris B. Straumal,Boris B. Straumal,Boris B. Straumal,Eugen Rabkin +6 more
TL;DR: In this article, the authors conducted a systematic study of the mechanisms of generation and healing of pores in ultrahigh-purity copper (99.9995) during high-pressure torsion (HPT).
Journal ArticleDOI
Strain softening mechanism at meso scale during micro-compression in an ultrafine-grained pure copper
TL;DR: In this article, the Kernel average misorientation (KAM) distribution measured by electron backscatter diffraction (EBSD) was applied to qualitatively evaluate dislocation density in the interior of the grains.
Journal ArticleDOI
Developing superplasticity in ultrafine-grained metals
TL;DR: In this article, the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compared the experimental strain rates with those predicted using the theoretical model for conventional super-plastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.
Journal ArticleDOI
Impact Toughness of Ultrafine‐Grained Commercially Pure Titanium for Medical Application
Alexander V. Polyakov,Alexander V. Polyakov,Irina P. Semenova,Elena V. Bobruk,Seung Mi Baek,Hyoung Seop Kim,Ruslan Z. Valiev,Ruslan Z. Valiev +7 more
Journal ArticleDOI
Effect of Grain Shape on Texture Formation during Severe Plastic Deformation of Pure Copper
TL;DR: In this article, a combination of electron backscattered diffraction and polycrystal plasticity modeling was used to study the effect of grain shape on texture development in high pressure torsion and high pressure double torsions in high purity Cu.
References
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Journal ArticleDOI
The Deformation and Ageing of Mild Steel: III Discussion of Results
TL;DR: In this paper, an attempt is made to explain the observed phenomena in the yielding and ageing of mild steel, described in two previous papers, in the general terms of a grain-boundary theory.
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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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Principles of equal-channel angular pressing as a processing tool for grain refinement
TL;DR: In this article, a review examines recent developments related to the use of ECAP for grain refinement including modifying conventional ECAP to increase the process efficiency and techniques for up-scaling the procedure and for the processing of hard-to-deform materials.
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Using high-pressure torsion for metal processing: Fundamentals and applications
TL;DR: High pressure torsion (HPT) is a well-known technique for metal forming as discussed by the authors, where samples are subjected to a compressive force and concurrent torsional straining.
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Diffusional Viscosity of a Polycrystalline Solid
TL;DR: In this article, it is suggested that mosaic boundaries and boundaries between grains of nearly the same orientation may not serve as sources or sinks of the diffusion currents, in which case the creep rate will depend only on the configuration of grain boundaries having a sizable orientation differen...