A novel single pass severe plastic deformation technique: Vortex extrusion

Shahbaz, M.; Pardis, N.; Ebrahimi, R.; Talebanpour, B.

doi:10.1016/j.msea.2011.09.114

Cited by 50 publications

(15 citation statements)

References 24 publications

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“…Single pass SPD techniques, however, are capable of introducing relatively large plastic strains by combining different modes of deformation that can result in smaller grains with a high fraction of HAGBs compared to those of the conventional forming operations (like extrusion or rolling). The single pass methods, which can be found in Tables 2-7, are : nonequal channel angular pressing /channel angular deformation (CAD) [116,117], double change channel angular pressing [118], ECAP forward extrusion (ECAP-FE) [231], forward extrusion ECAP (FE-ECAP) [232], incremental angular splitting [119], torsion extrusion [240,241], vortex Extrusion (VE) [188,189], variable cross-section direct extrusion (CVCDE) [190,191], gradiation extrusion [192,193], integrated extrusion [194], compound extrusion [195], compound twist extrusion/C-TE (TE+Ext.) [243], alternate extrusion (AE) [196], large strain machining [120] and large strain extrusion machining (LSEM) [245].…”

Section: -mentioning

confidence: 99%

“…[140] Axi-symmetric forward spiral extrusion (AFSE) [141] High-speed high pressure torsion (HS-HPT) [142] Severe torsion straining (STS) [143] Friction stir processing (FSP) [144,145] [148] Off-axis twist extrusion [186] Tube cyclic extrusioncompression (TCEC) [187] Vortex extrusion (VE) [188,189] Variable cross-section direct extrusion (CVCDE) [190,191] Gradiation extrusion [192,193] Integrated extrusion [194] Compound extrusion [195] Alternate extrusion (AE) [196] Spin extrusion [197] Rotary extrusion (RT) [198] Plastic flow machining (PFM) [199] Compound twist extrusion/C-TE (TE+Ext. )…”

Section: Summery and Conclusionmentioning

confidence: 99%

See 1 more Smart Citation

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

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120

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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: -mentioning

confidence: 99%

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

Self Cite

120

View full text Add to dashboard Cite

show abstract

“…Processing was performed in a few steps with material separation for short parts after each step. Shahbaz et al [92], Ma et al [93], and Li et al [94] suggested different concepts for introducing additional strains during one step extrusion using, respectively, spiral conical dies, rotating conical dies, multi-step dies, and so forth. These dies provide only moderate improvements at the laboratory scale and did not find further developments as techniques of SPD.…”

Section: Spd By Ordinary Forming Operationsmentioning

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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“…The basic and most familiar SPD techniques include equal channel angular pressing (ECAP) [4], high-pressure torsion [5], accumulative roll bonding [6], multi-directional forging(MDF) [7] and twist extrusion (TE) [8]. The increasing interest of materials scholars to produce bulk nanostructured materials has led to development of new SPD methods such as constraint groove pressing(CGP) [9], simple shear extrusion (SSE) [10], cyclic expansion-extrusion (CEE) [11], vortex extrusion (VE) [12] and so on. Among all these methods, TE and SSE are based on direct extrusion and they can be easily installed on any standard extrusion equipment or set in industrial production lines [10,13].…”

Section: Introductionmentioning

confidence: 99%