A modification on ECAP process by incorporating torsional deformation

Mani, Behtash; Jahedi, Mohammad; Paydar, Mohammad Hossein

doi:10.1016/j.msea.2011.02.015

Cited by 41 publications

(18 citation statements)

References 27 publications

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“…However, ongoing attempts have been made by different investigators in order to improve and increase the efficiency of various SPD methods. Some of these methods involve dual equal channel lateral extrusion [9], torsional equal channel angular pressing [10], cyclic forward-backward extrusion [11], and elliptical cross-section spiral equal-channel extrusion [12] for deforming bulk specimens. On the other hand, dissimilar channel angular pressing [13][14][15][16] was proposed for sheet forming.…”

Section: Introductionmentioning

confidence: 99%

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Sepahi-Boroujeni

Fereshteh-Saniee

2015

J Mater Sci

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A novel severe plastic deformation (SPD) process, namely expansion equal channel angular extrusion (Exp-ECAE) is proposed in this paper. With this regard, a spherical cavity is provided at the junction of the ECAE channels. The numerical simulations of the Exp-ECAE process resulted in finding suitable tool geometry for this operation. Using this optimum shape, several practical Exp-ECAE experiments were conducted with AA6063 aluminum at different process conditions. Because of the expansion cavity, a pseudo back-pressure mechanism was provided for the tests. The experimental findings showed that after the 1st pass of the Exp-ECAE process, the yield stress and hardness of the material were increased about 300 and 50 %, respectively. These improvements were much more than those achieved via other SPD techniques such as ECAE and twist extrusion for the same alloy. The homogeneity of hardness distribution along the cross section of the Exp-ECAE product was also acceptable. Further passes of the process just resulted in better ductility for the component such that after the 3rd pass, almost 97 % of ductility of the annealed billet was recovered. However, a slight decrease in the strength of the product was observed after the 2nd and 3rd passes.

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Section: Introductionmentioning

confidence: 99%

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Sepahi-Boroujeni

Fereshteh-Saniee

2015

J Mater Sci

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“…Therefore, further studies are necessary to conducted on commercializing these SPD methods [10,11]. To simplify and improve these processing operations or to achieve unique properties of materials processed by SPD, some efforts have been made on the modifications of these methods [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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

Wang

et al. 2013

Materials & Design

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“…To this end, 8-node linear brick elements (C3D8) and 4-node 3D bilinear rigid quadrilateral elements (R3D4) were used to mesh the billet and the rigid parts, respectively [81]. Similar simulation setup was used in an earlier study [82]. The predicted strain fields were cross-correlated with the hardness values as will be discussed later in the paper.…”

Section: Finite Element Simulations Of Ecapmentioning

confidence: 99%

“…The hardness and strain values have direct relationship [71,82,83,88,[102][103][104]. To verify the strain trend, the finite element analysis results were shown in Fig.…”

Section: Hardness Of Al and Al-cnt Composites Processed By Ecapmentioning

confidence: 99%

Microstructure and mechanical properties of carbon nanotubes reinforced aluminum matrix composites synthesized via equal-channel angular pressing

Zare

Jahedi

Toroghinejad

et al. 2016

Materials Science and Engineering: A

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a b s t r a c tIn this work, 2 vol% carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composites of superior microstructural homogeneity are successfully synthesized using Bc equal-channel angular extrusion (ECAP) route. The key step in arriving at high level of homogeneous distribution of CNTs within Al was preparation of the powder using simultaneous attrition milling and ultra-sonication processes. Microstructure as revealed by electron microscopy and absence of Vickers hardness gradients across the material demonstrate that the material reached the homogeneous state in terms of CNT distribution, porosity distribution, and grain structure after eight ECAP passes. To facilitate comparison of microstructure and hardness, samples of Al were processed under the same ECAP conditions. Significantly, the composite containing only 2 vol% exhibits 20% increase in hardness relative to the Al samples.

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A modification on ECAP process by incorporating torsional deformation

Cited by 41 publications

References 27 publications

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

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

Microstructure and mechanical properties of carbon nanotubes reinforced aluminum matrix composites synthesized via equal-channel angular pressing

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