Development of new routes of severe plastic deformation through cyclic expansion–extrusion process

Pardis, N.; Chen, Cai; Shahbaz, M.; Ebrahimi, R.; Tóth, László

doi:10.1016/j.msea.2014.06.074

Cited by 35 publications

(9 citation statements)

References 21 publications

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“…A prominent example is related to HCEE process in which the friction force and deformation load are reduced to increase the sample size (l/d) from ³5 in regular CEE to more than 10 mm in HCEE. 80,140) In some of the semicontinuous processes in which drawing is applied at the outlet like ECAD, the tensile stress at the outlet side should not exceed from the yield strength of the material otherwise the plastic deformation is limited by yielding the sample. For example, the angle between input and output channels in ECAD process should be larger to prevent different damages in final products.…”

Section: Sizementioning

confidence: 99%

An Overview on the Continuous Severe Plastic Deformation Methods

Faraji

Torabzadeh

2019

Mater. Trans.

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Severe Plastic Deformation (SPD) processes have been extensively investigated in the last 30 years to facilitate the production processes of nanostructured (NS) or ultrafine-grained (UFG) materials with unique properties. However, the majority of the efforts were limited on the laboratory-scale investigations not to be able to overcome the demands for industrial scale applications. Researchers have tried to introduce effective industrial methods for processing large and long UFG/NG materials. In this review, all industrial processes especially continuous SPD methods which are more suitable for mass production are categorized and explained. Furthermore, the factors influencing the process efficiency were presented to give a vision to the researchers who want to step in this scientific field. Finally, the industrial processes were compared regarding final microstructure and properties.

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Section: Sizementioning

confidence: 99%

An Overview on the Continuous Severe Plastic Deformation Methods

Faraji

Torabzadeh

2019

Mater. Trans.

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“…In addition, the differences in orientation and aspect ratio of the expanded elements with respect to the extrusion direction for CEEOP and CEESP might be another reason for such differences in microstructures. 20 Weng 25 have studied the influence of ECAP on hot workability of AZ80 Mg alloy. In their work, the accumulated strain of one-time ECAP is 1, and one-pass ECAP at 350°C can refine the grain size of annealed alloy from 155 to around 7 mm, four-pass ECAP can refine that to 6 mm, and eight-pass ECAP can refine that to 3 mm.…”

Section: Analysis Of Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…18 However, in other techniques with axisymmetric die geometry, such as CEC, cyclic expansion-extrusion (CEE), and tube channel pressing, the processing route would be restricted to reversing the billet orientation or pressing direction with regard to die among successive passes. 19 Thus, Pardis et al 20 proposed a non-axisymmetric version of the CEE technique which makes it possible to introduce new processing routes of this technique for processing billets with rectangular cross section. In their work, two processing routes (I: cyclic expansion-extrusion process in the same plane (CEESP) and II: CEESP) were experimentally performed on aluminum alloy 1050; the processed billets were investigated and compared in terms of their microstructural and mechanical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of different cyclic expansion–extrusion processes on microstructure and mechanical properties of AZ80 magnesium alloy

Xue

Yang

Bai

et al. 2017

Advances in Mechanical Engineering

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In this work, cyclic expansion-extrusion process in the same plane and cyclic expansion-extrusion process in two orthogonal planes have been employed, and the isothermal finite element simulations of both processes have been carried out. The equivalent plastic strains of AZ80 magnesium alloy billets produced by cyclic expansion-extrusion process in the same plane and cyclic expansion-extrusion process in two orthogonal planes were analyzed. Furthermore, the distinction between the accumulated equivalent plastic strains of both processes was also explored. The AZ80 magnesium alloy samples machined from the deformed billets were tested by tensile test machine, hardness tester, and optical microscope. This work also discussed the relationships between the microstructure and mechanical properties of deformed billets. The research results show that the average equivalent plastic strain of deformed billet is larger caused by two-pass cyclic expansion-extrusion process in two orthogonal planes than that by two-pass cyclic expansion-extrusion process in the same plane, and furthermore, the deformation uniformity after two-pass cyclic expansion-extrusion process in two orthogonal planes is far superior to that after two-pass cyclic expansion-extrusion process in the same plane. Cyclic expansion-extrusion process in the same plane can partly refine the grain size of annealed alloy from 190 to around 10 mm; however, cyclic expansion-extrusion process in two orthogonal planes can substantially refine that from 190 to approximately 3 mm. Two-pass cyclic expansion-extrusion process in the same plane can significantly improve the Brinell hardness of annealed alloy from 61.5 to 88.5 HB. Similarly, two-pass cyclic expansion-extrusion process in two orthogonal planes can also obviously improve that from 61.5 to 86.6 HB. Ultimate tensile strengths via two-pass cyclic expansionextrusion process in the same plane and cyclic expansion-extrusion process in two orthogonal planes increase by 60 and 40 MPa than the annealed alloy, respectively. With the identical strain accumulation and deformation temperature, cyclic expansion-extrusion process in two orthogonal planes might look to be attractive when compared with equal-channel angular pressing for improvement of ultimate tensile strength and hardness as well as for grain refinement.

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“…Severe plastic deformation processes can be used to reduce matrix grain size to submicrometer or nanometer dimension. These processes include equal channel angular extrusion/pressing (ECAE/ECAP) [9], multiaxial forging [10], cyclic extrusion and compression (CEC) [11], high pressure torsion (HPT) [12], accumulative roll bonding (ARB) [13,14], and mechanical alloying (MA) [5]. However, all these processes, except ARB and MA, suffer from two main drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Effect of Processing on Mechanically Alloyed and Spark Plasma Sintered Al-Al₂O₃Nanocomposites

Saheb

Khan

Hakeem

2015

Journal of Nanomaterials

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Metal matrix nanocomposites are advanced materials developed using ceramic nanoreinforcements and nanocrystalline metal matrices. These composites have outstanding properties and high potential for large number of functional and structural applications. In this work, nanocrystalline aluminium and Al-Al2O3nanocomposites were synthesised using mechanical alloying and consolidated through spark plasma sintering technique. Scanning electron microscopy, X-ray diffraction, and mapping were used to characterize the powders and sintered samples. Density and hardness of sintered samples were measured using densimeter and hardness tester, respectively. It was found that milling of pure aluminium for 24 h reduced its crystallite size to less than 100 nm. For Al-Al2O3nanocomposites, milling for 24 h decreased the crystallite size of the aluminium phase and resulted in uniform dispersion of the reinforcement. Sintering of the synthesised powders led to grain growth. Al2O3contributed to growth inhibition when samples were sintered for 20 minutes and improved the hardness but reduced densification. The Al-10 vol.% Al2O3nanocomposite had the highest Vickers hardness value of 1460 MPa.

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Development of new routes of severe plastic deformation through cyclic expansion–extrusion process

Cited by 35 publications

References 21 publications

An Overview on the Continuous Severe Plastic Deformation Methods

An Overview on the Continuous Severe Plastic Deformation Methods

Effect of different cyclic expansion–extrusion processes on microstructure and mechanical properties of AZ80 magnesium alloy

Effect of Processing on Mechanically Alloyed and Spark Plasma Sintered Al-Al₂O₃Nanocomposites

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Development of new routes of severe plastic deformation through cyclic expansion–extrusion process

Cited by 35 publications

References 21 publications

An Overview on the Continuous Severe Plastic Deformation Methods

An Overview on the Continuous Severe Plastic Deformation Methods

Effect of different cyclic expansion–extrusion processes on microstructure and mechanical properties of AZ80 magnesium alloy

Effect of Processing on Mechanically Alloyed and Spark Plasma Sintered Al-Al2O3Nanocomposites

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Effect of Processing on Mechanically Alloyed and Spark Plasma Sintered Al-Al₂O₃Nanocomposites