On the mechanical properties and microstructure of commercially pure Al fabricated by semi-constrained groove pressing

Morattab, S.; Ranjbar, Khalil; Reihanian, M.

doi:10.1016/j.msea.2011.05.074

Cited by 53 publications

(34 citation statements)

References 34 publications

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“…A rapid increase in hardness was observed after the first pass followed by a continuous increase with a lower rate in agreement with previous observations for aluminum alloys, Figure 10c [27,[29][30][31]. This behaviour was related to the rise in dislocation density and work hardening of the material.…”

Section: Effect Of Annealing Temperature and Number Of Passes On Mechsupporting

confidence: 91%

“…These small equiaxed grains are probably dislocation cells formed inside the original grains. Similar observation was reported for aluminum alloys, where both equiaxed and elongated dislocation cells were observed in the sheets after one and four passes of constrained groove pressing [25,27]. It was concluded that grain refinement was caused by dislocation gliding, accumulation, interaction and spatial rearrangement.…”

Section: Effect Of Ram Speed and Number Of Passes On Grain Sizesupporting

confidence: 82%

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Effect of pre‐processing annealing and ram speed on mechanical properties for low carbon steel processed by constrained groove pressing

Mahallawy

George

Gad

et al. 2019

Materialwissenschaft Werkst

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Constrained groove pressing (CGP) has emerged for producing ultra‐fine‐grained materials with distinguished properties. Low carbon steel sheets were subjected to severe plastic deformation by constrained groove pressing process. The effect of pre‐processing annealing temperature, ram speed and number of passes on microstructure, mechanical properties and wear behaviour of the sheets were investigated. The 3 mm thick sheets were deformed by a constrained groove pressing die at ram speeds: 5 mm/min, 10 mm min−1 and 20 mm min−1. Furthermore, the as received sheets were annealed at 600 °C and 900 °C, then deformed at ram speed 20 mm min−1. The annealing temperature 900 °C led to slightly coarser grains, lower strength and larger ductility compared to those obtained after annealing at 600 °C. With lowering the ram speed to 5 mm min−1, the number of passes could be increased to 10 passes while increasing ram speed from 5 mm min−1 to 20 mm min−1 improved the mechanical properties; after 3 constrained groove pressing passes, the ultimate tensile strength increased from 420 MPa to 490 MPa, the hardness from 174 HV 1 to 190 HV 1 and the elongation from 7.6 % to 9.5 %. Finer grains were also obtained by increasing ram speed. Wear resistance was greatly enhanced by constrained groove pressing and by the increase in ram speed.

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Section: Effect Of Annealing Temperature and Number Of Passes On Mechsupporting

confidence: 91%

Section: Effect Of Ram Speed and Number Of Passes On Grain Sizesupporting

confidence: 82%

Effect of pre‐processing annealing and ram speed on mechanical properties for low carbon steel processed by constrained groove pressing

Mahallawy

George

Gad

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…When using the GP technique, the grain size was reduced to 1000 nm after four passes for commercially pure aluminum [8]. With a semi-constrained GP process, Morattab et al [7] obtained an average grain size of 300 nm in pure aluminum after four passes. When using the TE technique, the average grain size was reduced to about 1600 nm at the outer edge after 4 passes [9].…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

“…Equal-Channel Angular Press / Extrusion (ECAP/ECAE) [2,3], High Pressure Torsion (HPT) [4,5], Groove Pressing (GP) [6][7][8], Twist Extrusion (TE) [9], Asymmetric Rolling (AR) [10,11], Accumulative Roll Bonding (ARB) [1,[12][13][14], and Accumulative Back Extrusion (ABE) [15]. The ECAP technique was employed to produce ultrafine grained AA1070 and AA6060 samples by Hockauf and Meyer [2].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Nanostructured Aluminum Sheets Using Four-Layer Accumulative Roll Bonding

Lü

Tieu

et al. 2014

Materials and Manufacturing Processes

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In this paper, an extended accumulative roll bonding (ARB) technique, called the 'Four-Layer Accumulative Roll Bonding (FL-ARB)' technique, is presented for the first time. This technique has been employed to produce ultrafine-grained commercial pure aluminum sheets with success. After three FL-ARB passes, the grain size of pure aluminum was seen to reduce to 380 nm. The bonding strength of the sheets after rolling has also been discussed. Theoretical calculations showed that the bonding strength of sheets processed by the FL-ARB technique can be 2-2.2 times greater than that by the traditional ARB technique. The main advantages of the FL-ARB technique are (a) improvement of the interface bonding, with increasing deformation in each pass, (b) applicability of the technique at room temperature to process most metals, and (c) generation of the largest equivalent strain in the workpiece with the same number of passes, compared with other severe plastic deformation techniques.

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“…The constrained groove pressing (CGP) method, originally proposed by Shin et al [12], was based on the repetitive corrugation and straightening of the sheets and it can produce plate-shaped ultrafine grained metals with relatively homogeneous strain in the sheets. The CGP method has been employed to refine grains for pure aluminum [12,13], pure Cu [14,15], Cu-38Zn alloy [16], low carbon steel [17,18] and nickel sheets [19]. Until now, most researches on CGP were concentrated on metals with face and body centered cubic structure.…”

Section: Introduction mentioning

confidence: 99%

Refinement Strengthening of AZ31 Magnesium Alloy by Warm Constrained Groove Pressing

Lin¹,

Tang²,

Zhao³

et al. 2017

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The grain refinement and its effect on the mechanical properties of AZ31 magnesium alloys were investigated. The grain refinement was conducted using one of the severe plastic deformation methods, warm constrained groove pressing (CGP) technology. The effective strain was analyzed using the DEFORM-3D software. It was found that the effective strain distribution in AZ31 sheet was homogeneous after a complete four-stage of CGP at 473 K. The average grain size was reduced from 20 μm to 9 μm and the hardness was improved from 55.84 HBW to 69.16 HBW after a complete CGP process at 473 K. The yield stress and ultimate tensile strength increase with grain refinement, from 132 MPa and 240 MPa to 155 MPa and 285 MPa, respectively, following the Hall-Petch relationship. Subjected to annealing at 530 K for 15 minutes, the average grain size of CGP sample decreases slightly and the elongation increased up to 16.2%, close to 17.72% for the pre-CGP samples.

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On the mechanical properties and microstructure of commercially pure Al fabricated by semi-constrained groove pressing

Cited by 53 publications

References 34 publications

Effect of pre‐processing annealing and ram speed on mechanical properties for low carbon steel processed by constrained groove pressing

Effect of pre‐processing annealing and ram speed on mechanical properties for low carbon steel processed by constrained groove pressing

Fabrication of Nanostructured Aluminum Sheets Using Four-Layer Accumulative Roll Bonding

Refinement Strengthening of AZ31 Magnesium Alloy by Warm Constrained Groove Pressing

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