Plastic flow, structure and mechanical properties in pure Al deformed by twist extrusion

Orlov, Dmitry; Beygelzimer, Yan; Synkov, Sergey; Varyukhin, V. N.; Tsuji, Nobuhiro; Horita, Zenji

doi:10.1016/j.msea.2009.06.005

Cited by 98 publications

(21 citation statements)

References 22 publications

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“…The inhomoge- neous structural distribution of ECSEE-ed materials is a more important question to be addressed. Similarly, a grain refinement gradient was found in TE-ed metals with enhancing the high ductility [30]. Besides, the evolution of structure observed is in a reasonable agreement with the results reported of HPT method [31].…”

Section: Microstructure Examinationsupporting

confidence: 89%

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

Wang

et al. 2013

Materials & Design

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Section: Microstructure Examinationsupporting

confidence: 89%

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

Wang

et al. 2013

Materials & Design

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“…6). This finding with FEM accounts for experimental observations of more uniform distribution of the microstructure and mechanical properties throughout the sample processed by multipass TE as was found for aluminum [15], for copper [7], and for titanium [16].…”

Section: Origins Of Discrepancies Between Fem and Helical Flow Modelsupporting

confidence: 83%

Simple shear model of twist extrusion and its deviations

Latypov

Lee²,

Beygelzimer

et al. 2015

Met. Mater. Int.

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Twist extrusion (TE) is a severe plastic deformation method with a potential for commercialization. Advancing TE toward industrial use requires in-depth understanding of deformation during the process and its dependence on processing factors. The helical flow model introduced with the concept of TE provides for a concise description of deformation in the process. To date, however, it was unclear under which conditions the helical flow model yields accurate predictions of deformation in TE. This paper presents a systematic finite-element study performed to identify effects of some key process and material factors on deformation in TE and its departure from the ideal deformation described by the helical flow model. It was found that high strain-hardening rate and friction lead to violations of the assumptions of the helical flow model and that these violations result in departure from the ideal deformation. Deviations from the ideal deformation tend to increase on decreasing the length of the twist channel. Friction effects appear especially critical to be considered for accurate prediction of deformation in TE. Finite-element simulations taking friction into account show good qualitative agreement with earlier marker-insert experiments. The results of the present finite-element study allowed for defining the simple shear model of TE.

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“…These techniques include equalchannel angular pressing (ECAP) (Ref [5][6][7][8], high-pressure torsion (HPT) ( Ref 3,9,10), torsion-extrusion (TE) (Ref [11][12][13][14], combined tension-torsion (CTT) ( Ref 15,16) and elliptical cross-sectioned spiral equal-channel extrusion (ECSEE) (Ref [17][18][19][20][21]. All of these procedures are capable of introducing large plastic straining and significant microstructural refinement in bulk crystalline solids.…”

Section: Introductionmentioning

confidence: 99%

Microhardness Distribution and Microstructural Evolution in Pure Aluminum Subjected to Severe Plastic Deformation: Elliptical Cross-Sectioned Spiral Equal-Channel Extrusion (ECSEE)

et al. 2015

J. of Materi Eng and Perform

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Elliptical cross-sectioned spiral equal-channel extrusion (ECSEE), one of the severe plastic deformation techniques, is of great efficiency in producing bulk ultrafine or nanostructured materials. In this paper, the simulation and experimental researches on ECSEE of high-purity aluminum were conducted to investigate the equivalent strain distribution and microhardness distribution on three orthogonal planes, as well as microstructural evolution. Simulation result shows a significant strain gradient on three planes. Microhardness tests comprise the similar results to strain distribution. According to transmission electron microscopy (TEM) results, microstructural evolution ranged from coarse structures to ultrafine structures by undergoing the shear bands, subgrains, high-angle misorientation grain boundaries and equiaxed structures. There are also some distinctions with reference to grain refinement level, grain boundary styles and dislocation distribution on different positions. The TEM investigations are in good agreement with microhardness tests.

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Plastic flow, structure and mechanical properties in pure Al deformed by twist extrusion

Cited by 98 publications

References 22 publications

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

Simple shear model of twist extrusion and its deviations

Microhardness Distribution and Microstructural Evolution in Pure Aluminum Subjected to Severe Plastic Deformation: Elliptical Cross-Sectioned Spiral Equal-Channel Extrusion (ECSEE)

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