Spiral equal channel angular extrusion (Sp-ECAE) as a modified ECAE process

Fadaei, Abbas; Farahafshan, Faramarz; Sepahi-Boroujeni, Saeid

doi:10.1016/j.matdes.2016.10.021

Cited by 18 publications

(7 citation statements)

References 32 publications

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“…[121] Tube channel pressing (TCP) [122,123] Parallel tubular channel angular pressing (PTCAP) [124] Single-roll angularrolling (SRAR) [125] Spiral equal channel angular extrusion (Sp-ECAE) [126] High pressure tube twisting (HPTT) [128,129] 3 Rotation torsion [130] 4 High-pressure shearing (t-HPS) [131] 5 HPT for ring specimens [132] High pressure torsion for bulk samples [28] Continuous highpressure torsion for bars/rods [29,133] High pressure sliding [134] Cone-cone method [135] Hollow cone highpressure torsion [136] Incremental high pressure torsion [137] Compressive torsion processing [138] High pressure double torsion (HPDT) [139] High pressure torsioncylindrical segment (HPT-CS)…”

Section: Summery and Conclusionmentioning

confidence: 99%

An overview on severe plastic deformation: research status, techniques classification, microstructure evolution, and applications

Bagherpour

Pardis

Reihanian

et al. 2018

Int J Adv Manuf Technol

114

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The present overview gives a new approach toward developments and recent achievements in severe plastic deformation. The review focuses on several subjects. First, an outline of SPD research status in the world is presented by literature analysis based on the total number of publications, citations and the contribution of the topranked countries. Second, the mechanisms of grain refinement and grain growth during SPD processing are discussed by means of the latest concepts. Third, all SPD methods invented so far are classified based on a new approach. Up to now, the growing tendency of researchers to introduce new SPD techniques results in a large number of SPD methods which can be considered as new or modified techniques or a combination of previous ones. Such a reference can help to prevent the future duplication to introduce the SPD processes, which are technically similar. At the end, the practical applications of ultrafine/nanostructured materials and industrial commercialization of SPD methods are summarized.

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Section: Summery and Conclusionmentioning

confidence: 99%

An overview on severe plastic deformation: research status, techniques classification, microstructure evolution, and applications

Bagherpour

Pardis

Reihanian

et al. 2018

Int J Adv Manuf Technol

114

View full text Add to dashboard Cite

show abstract

“…They include an inlet channel with variable cross-section, additional twist and small angular steps [68,69]; transverse shear and expanding zone between channels [70,71]; an additional area reduction step in the outlet channel [72]. These and similar modifications significantly increase extrusion pressure, decrease a billet length and require extrusion "billet-bybillet" without channel lubrication and inspection.…”

Section: Modifications Of Ecaementioning

confidence: 99%

Review: Modes and Processes of Severe Plastic Deformation

Segal¹

2018

Preprint

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In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD techniques from common forming operations. For large plastic strains, deformation mode depends on the distribution of strain rates between continuum slip lines and can be varied from pure shear to simple shear. A scalar, invariant and dimensionless coefficient of deformation mode is introduced as a normalized speed of rigid rotation. On this basis, simple shear provides the optimal mode for structure modification and grain refinement whereas pure shear is "ideal" for forming operations. Special experiments and SPD practice confirm this conclusion. Various techniques of SPD are classified and described in accordance with simple shear realization or approximation. It is shown that correct analyses of the processing mechanics and technological parameters are essential for comparison of SPD techniques and the development of effective industrial technologies.

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“…(d) Several attempts have been made to increase strain intensity and to reduce the number of ECAE passes. They include an inlet channel with a variable cross-section, additional twist, and small angular steps [ 68 , 69 ]; a transverse shear and expanding zone between channels [ 70 , 71 ]; and an additional area reduction step in the outlet channel [ 72 ]. These and similar modifications significantly increase extrusion pressure, decrease the billet length, and require extrusion “billet-by-billet” without channel lubrication and inspection.…”

Section: Processes Of Spdmentioning

confidence: 99%

Review: Modes and Processes of Severe Plastic Deformation (SPD)

Segal

2018

Materials

140

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In this review, severe plastic deformation (SPD) is considered as a materials processing technology. The deformation mode is the principal characteristic differentiating SPD techniques from common forming operations. For large plastic strains, deformation mode depends on the distribution of strain rates between continuum slip lines and can be varied from pure shear to simple shear. A scalar, invariant, and dimensionless coefficient of deformation mode is introduced as a normalized speed of rigid rotation. On this basis, simple shear provides the optimal mode for structure modification and grain refinement, whereas pure shear is “ideal” for forming operations. Special experiments and SPD practice confirm this conclusion. Various techniques of SPD are classified and described in accordance with simple shear realization or approximation. It is shown that correct analyses of the processing mechanics and technological parameters are essential for the comparison of SPD techniques and the development of effective industrial technologies.

show abstract

Spiral equal channel angular extrusion (Sp-ECAE) as a modified ECAE process

Cited by 18 publications

References 32 publications

An overview on severe plastic deformation: research status, techniques classification, microstructure evolution, and applications

An overview on severe plastic deformation: research status, techniques classification, microstructure evolution, and applications

Review: Modes and Processes of Severe Plastic Deformation

Review: Modes and Processes of Severe Plastic Deformation (SPD)

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