Journal ArticleDOI
Principle of equal-channel angular pressing for the processing of ultra-fine grained materials
TLDR
In this paper, it has been shown that submicrometer-grained structures may be produced in a wide range of materials (e.g. pure metals, metallic alloys including superalloys, intermetallics, semiconductors) by subjecting these materials to a very high plastic strain using either equal-channel angular (ECA) pressing or torsion straining under high pressure.About:
This article is published in Scripta Materialia.The article was published on 1996-07-15. It has received 1655 citations till now. The article focuses on the topics: Grain size & Equal channel angular extrusion.read more
Citations
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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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Producing bulk ultrafine-grained materials by severe plastic deformation
Ruslan Z. Valiev,Yuri Estrin,Zenji Horita,Zenji Horita,Terence G. Langdon,Michael J. Zehetbauer,Yuntian Zhu +6 more
TL;DR: In this article, an overview of recent achievements and new trends in the production of bulk ultrafine-grained (UFG) materials using severe plastic deformation (SPD) is presented.
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The process of grain refinement in equal-channel angular pressing
TL;DR: In this article, experiments were conducted on high purity aluminum to investigate the process of grain refinement during equal-channel angular (ECA) pressing, where samples were subjected to 1 to 4 pressings and then sectioned for microstructural examination in three mutually perpendicular directions.
References
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Nanocrystalline materials an approach to a novel solid structure with gas-like disorder?
TL;DR: In this paper, randomly oriented "nanocrystal" with sizes d below 10 nm, were compacted into a nanocrystalline solid, which consists of crystalline domains and a connective matrix without any short or long range order.
Journal ArticleDOI
Structural and thermodynamic properties of heavily mechanically deformed Ru and AlRu
TL;DR: In this paper, the authors report on high energy ball milling of Ru and AlRu and show that the deformation results in a drastic decrease of the crystal size to a nanometer scale and an increase of atomic-level strain.
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Nanocrystals by high energy ball milling
Carl C. Koch,Y.S. Cho +1 more
TL;DR: In this paper, it was shown that large grain boundary area provided by these nanocrystallites can help provide, along with the disordering energy, the driving free energy for the crystalline-to-amorphous transformation.
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An investigation of ductility and microstructural evolution in an Al−3% Mg alloy with submicron grain size
Jingtao Wang,Zenji Horita,Minoru Furukawa,Minoru Nemoto,Nikolai K. Tsenev,Ruslan Z. Valiev,Yan Ma,Terence G. Langdon +7 more
TL;DR: In this paper, a submicrometer-grained (SMG) Al−3% Mg solid solution alloy, with an initial grain size of ∼0.2 μm, was produced by intense plastic straining.