Microstructural changes and formability of Al–Mg ultrafine-grained aluminum plates processed by multi-turn ECAP and upsetting

Ciemiorek, Marta; Chromiński, Witold; Jasiński, C.; Lewandowska, M.

doi:10.1016/j.msea.2021.142202

Cited by 11 publications

(11 citation statements)

References 45 publications

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“…TEM study according to the position of the transparent part of the sample corresponds to an area remote from the center by about 5 mm or 1.5 mm from the edge. The study is fully consistent with the EBSD data from this and adjacent areas, as well as with data from similar studies of the peripheral region in bars obtained by radial shear rolling [ 16 , 24 , 28 , 30 ] and other SPD methods [ 7 , 8 , 9 ]. Here, it is important to note the equiaxed nature of grains and high-angle boundaries, as evidenced by electron diffraction in the corner of the image.…”

Section: Resultssupporting

confidence: 89%

“…The metal flow nonmonotonicity will also play a significant role here. The UFG forming conditions implementation is easy for the discrete processes such as pressing (equal channel angular pressing—ECAP) [ 7 , 8 , 9 ], forging [ 10 ], and high-pressure torsion (HPT) [ 6 , 11 ], but production complications solving is relevant for the long-length products with inevitable tensile stresses, such as rolling [ 12 ] or drawing [ 13 ]. The best improvement effect can be given by the vortex metal flow implementation under the all-round hydrostatic compression conditions [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Obtaining an Equiaxed Ultrafine-Grained State of the Longlength Bulk Zirconium Alloy Bars by Extralarge Shear Deformations with a Vortex Metal Flow

et al. 2023

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The method of radial shear rolling makes it possible to achieve comparable to high pressure torsion (HPT) method ultrahigh degrees of total strain level in combination with the vortex metal flow character for long-length large bulk bars unable by HPT and many other processes of sever plastic deformation (SPD). Sequential rolling of the Zr-1%Nb alloy was carried out under extreme conditions on two radial shear rolling mills with a total diameter reduction ε = 185% and a maximum total strain level = 46 mm/mm. The strain level and its cross-section distribution assessment by finite element method (FEM) simulation was studied. The final bar cross-section structure type distribution detailed study 1 mm resolution by electron back scatter diffraction (EBSD) mapping was performed. A gradient structure with a predominance of the equiaxed ultrafine-grained (UFG) state was found. The deformation level rising did not allow to refine it in the periphery zone more than that obtained nearly middle of the processing, but it allows for significant change in the axial zone structure. The additional large warm deformations by radial shear rolling have no additional grain refinement effect for already 300–600 nm refined zone. An equiaxed UFG structure was obtained in a relatively large volume of the sample with a reduced gradient towards the non-UFG center zone in regard to known works.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Obtaining an Equiaxed Ultrafine-Grained State of the Longlength Bulk Zirconium Alloy Bars by Extralarge Shear Deformations with a Vortex Metal Flow

et al. 2023

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“…In order to verify the effect of supersaturation on the material properties after the ECAP, a uniaxial tensile test for specimen with 10 mm gauge length [9] was performed, in which the yield strength Rp0.2, tensile strength Rm and elongation A were determined. These parameters were determined for the material immediately after the ECAP process and after additional upsetting.…”

Section: Materials Analysismentioning

confidence: 99%

“…Within the presented work, the field of interest was narrowed down to sheet metal microforming processes. As a method of obtaining ultra-fine grain, the ECAP process was adopted on the stand used in previous works [9]. The selected material for the tests is aluminium alloy 6060, which was chosen because of its high (in the group of aluminium alloys) strength properties.…”

Section: Introductionmentioning

confidence: 99%

Hybrid SPD process of aluminium 6060 for microforming

Presz

2023

Materials Research Proceedings

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Abstract. The increasing share and expansion of miniature devices requires the mastery of miniature parts production, including metal parts. In metal microforming, due to the conditions of mechanical similarity, the aim is to use materials with the smallest grain. Ultra-fine-grained metals (UFG) fulfill this requirement. These metals can be obtained, inter alia, in SPD processes such as ECAP. The work uses the extension of the SPD based on ECAP with additional metal forming operations necessary to obtain blanks for microforming in the form of a 0.2 mm foil. Three variants of the technological process were performed. This foil was then subjected to a micro-drawing operation aimed at determining the influence of the foil preparation process on the sheet metal microforming process flow.

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“…Существенную роль здесь также будет играть немонотонность течения металла. Реализация этих условий легка в дискретных процессах интенсивной пластической деформации вроде прессования [7][8][9], ковки [10], кручения под высоким давлением [6,11], но сложна для производства длинномерных изделий с неизбежными растягивающими напряжениями, где применяется прокатка [12] или волочение [13]. Наилучший эффект улучшения может дать реализация вихревого течения металла в условиях всестороннего гидростатического сжатия [14].…”

Section: Introductionunclassified

Study of the influence of large shear strains and vortex flow of metal on the formation of an equiaxed ultrafine-grained structure of the E110 zirconium alloy by X-ray diffraction analysis

Lutchenko,

Arbuz,

Kawalek

et al. 2022

EJSU

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In this work, the task was to investigate the processes of microstructure change occurring in relatively large bulk bars under the action of large plastic deformations. Such large levels of deformation are usually achievable in high pressure twisting of small flat disks, but are difficult to achieve in large bulk bars. The method of radial shear rolling makes it possible to achieve comparable ultrahigh degrees of deformation (~ 45 mm/mm) in combination with the vortex flow of the metal. Sequential rolling of the E110 zirconium alloy was carried out under extreme conditions on 2 radial shear rolling mills with a total reduction in diameter ε = 185% and a maximum accumulated deformation = 46 mm/mm. To assess the level of deformation and its distribution over the section, FEM modeling was carried out in Deform-3D. The resulting structure was studied by electron microscopy (TEM/SEM). A detailed cross-sectional study of the EBSD structure was performed with a resolution of 1 mm. A gradient structure with a predominance of an equiaxed ultrafine-grained structure was found, which was not very pronounced compared to the use of smaller deformations.

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Microstructural changes and formability of Al–Mg ultrafine-grained aluminum plates processed by multi-turn ECAP and upsetting

Cited by 11 publications

References 45 publications

Obtaining an Equiaxed Ultrafine-Grained State of the Longlength Bulk Zirconium Alloy Bars by Extralarge Shear Deformations with a Vortex Metal Flow

Obtaining an Equiaxed Ultrafine-Grained State of the Longlength Bulk Zirconium Alloy Bars by Extralarge Shear Deformations with a Vortex Metal Flow

Hybrid SPD process of aluminium 6060 for microforming

Study of the influence of large shear strains and vortex flow of metal on the formation of an equiaxed ultrafine-grained structure of the E110 zirconium alloy by X-ray diffraction analysis

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