Journal ArticleDOI
Microstructural evolution in commercial purity aluminum during high-pressure torsion
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In this article, the microstructural evolution occurring in disks of commercial purity aluminum processed by high pressure torsion (HPT) under constrained conditions was evaluated and the results showed the microhardness is lower and there is less grain refinement in the central regions of the disks in the initial stages of torsional straining but the micro structures become reasonably homogeneous across the disks at high imposed strains.Abstract:
An investigation was conducted to evaluate the microstructural evolution occurring in disks of commercial purity aluminum processed by high-pressure torsion (HPT) under constrained conditions. Microhardness measurements were taken to assess the variation in hardness across the diameters of disks subjected to different imposed strains and the microstructures were observed at the edges and in the centers of the disks using transmission electron microscopy. The results show the microhardness is lower and there is less grain refinement in the central regions of the disks in the initial stages of torsional straining but the microstructures become reasonably homogeneous across the disks at high imposed strains.read more
Citations
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Extreme grain refinement by severe plastic deformation: A wealth of challenging science
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Severe Plastic Deformation (SPD) Processes for Metals
Akira Azushima,Reiner Kopp,Antti Korhonen,D.Y. Yang,Fabrizio Micari,G.D. Lahoti,Peter Groche,Jun Yanagimoto,Nobuhiro Tsuji,Andrzej Rosochowski,Akira Yanagida +10 more
TL;DR: In this paper, the authors defined severe plastic deformation (SPD) as metal forming processes in which a very large plastic strain is imposed on a bulk process in order to make an ultra-fine grained metal.
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Grain boundaries in ultrafine grained materials processed by severe plastic deformation and related phenomena
TL;DR: Grain boundaries in ultrafine grained (UFG) materials processed by severe plastic deformation (SPD) are often called “non-equilibrium” grain boundaries.
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Strain gradient plasticity modelling of high-pressure torsion
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Atomic-scale analysis of the segregation and precipitation mechanisms in a severely deformed Al–Mg alloy
Xavier Sauvage,Nariman A. Enikeev,Nariman A. Enikeev,Ruslan Z. Valiev,Ruslan Z. Valiev,Y. Nasedkina,M.Y. Murashkin,M.Y. Murashkin +7 more
TL;DR: In this paper, a detailed study of deformation-induced segregation and precipitation mechanisms in an aluminum alloy containing 5.8% Mg subjected to severe plastic deformation (SPD) is presented.
References
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Journal ArticleDOI
Novel ultra-high straining process for bulk materials—development of the accumulative roll-bonding (ARB) process
TL;DR: In this paper, the accumulative roll-bonding (ARB) method was proposed to introduce high plastic strain without any geometrical change if the reduction in thickness is maintained to 50% every rolling pass.
Journal ArticleDOI
Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion
Alexander P. Zhilyaev,Alexander P. Zhilyaev,G.V. Nurislamova,B.-K. Kim,Maria Dolors Baró,Jerzy A. Szpunar,Terence G. Langdon +6 more
TL;DR: In this paper, a simple model is proposed to explain the development of a homogeneous microstructure in high pressure torsion (HPT) processing of pure nickel samples, showing that the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples.
Journal ArticleDOI
Structure and deformaton behaviour of Armco iron subjected to severe plastic deformation
TL;DR: In this paper, structural evolutions in an Armco iron subjected to severe plastic deformation by torsion under high pressure are anlysed with conventional and high resolution electron microscopes.
Journal ArticleDOI
On the homogeneity of deformation by high pressure torsion
A. Vorhauer,Reinhard Pippan +1 more
TL;DR: In this article, microstructures and microhardness have been carefully characterized for an austenitic steel deformed by high pressure torsion up to 16 total revolutions, and nearly idealized torsions deformation is observed even at large number of revolution.
Journal ArticleDOI
Grain refinement and superplastic flow in an aluminum alloy processed by high-pressure torsion
Sergey V. Dobatkin,Elena N. Bastarache,Genki Sakai,Takeshi Fujita,Zenji Horita,Terence G. Langdon +5 more
TL;DR: In this article, high-pressure torsion (HPT) was used to refine Al-3% Mg-0.2% Sc alloy to refine the grain size to ∼ 0.15mm.