Strain partitioning by recurrent shear localization during equal-channel angular pressing of an AA6060 aluminum alloy

Frint, Philipp; Wagner, Martin F.-X.

doi:10.1016/j.actamat.2019.07.009

Cited by 41 publications

(24 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3a confirms our estimate that shear and matrix bands exhibit similar width distributions; since they are arranged in an alternating pattern, their volume fractions are approximately 50%. We highlight that band thickness does not vary significantly across the entire thickness of the billet, as shown by additional analyses from different cutting and viewing directions, [15]). By placing lines perpendicular to the interfaces between the bands, and employing a simple line intersection analysis, the shear band width distribution plot shown in fig.…”

Section: Strain Partitioning During Ecapmentioning

confidence: 63%

“…From the considerably elongated indents inside the shear bands it is obvious that these regions have been severely deformed far exceeding the nominal shear strain that is typically introduced by a single pass of ECAP using a 90° die. A simple analysis comparing indents in matrix and shear bands yields an estimated equivalent plastic strain due to this massive shear of about 3.6, [15]. In contrast, the matrix bands next to those severely sheared regions experience much less strain.…”

Section: Strain Partitioning During Ecapmentioning

confidence: 98%

“…One focus of our previous study [15] was a detailed analysis of the local deformation path of material points passing through the plastic deformation region. We used a simple visio-plastic mapping technique by tracking indents that were prepared on a polished inner surface of a lengthwise split billet.…”

Section: Strain Partitioning During Ecapmentioning

confidence: 99%

“…As discussed in detail in [15], a careful reconstruction of the shapes of the distorted indents (by fitting ellipses, fig. 2d) allows to analyze the deformation history along representative paths.…”

Section: Strain Partitioning During Ecapmentioning

confidence: 99%

“…In the light of these predominantly detrimental effects, here we consider a somewhat surprising and special situation where repeated shear localization actually results in the generation of a new type of UFG material with bulk lamellar structure. We have recently studied ECAP of an AA6060 aluminum alloy that has been cold-worked by extrusion at room temperature prior to ECAP, [15]. Interestingly, the material exhibits a pronounced and recurrent formation of shear bands, separated by much less deformed regions (which we refer to as matrix bands in the remainder of this paper).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Formation of bulk-laminated materials by localized deformation during ECAP of an AA6060 aluminum alloy

Wagner

Frint

2020

MATEC Web Conf.

Self Cite

View full text Add to dashboard Cite

This paper addresses localized plastic flow during equal-channel angular pressing (ECAP) of an AA6060 aluminum alloy. We observe an alternating formation of shear bands and matrix bands during ECAP that leads to pronounced strain partitioning without cracking. Local deformation is analyzed by considering the distortion of indents along flow lines in the center of a split billet. We estimate equivalent strains of about 3.6 inside the shear bands, whereas plastic deformation in the adjacent matrix bands is almost negligible. Microstructural analysis by SEM and STEM confirms that the shear bands exhibit typical features of severely plastically deformed microstructures at the onset of forming an ultrafine-grained microstructure. We further present statistics of band widths, and we discuss the roles material hardening as well as ECAP die geometry (in terms of the inner die radius) in facilitating the recurrent localized deformation that, in the absence of crack nucleation, leads to the production of an interesting and novel type of bulk-laminated materials by ECAP.

show abstract

Section: Strain Partitioning During Ecapmentioning

confidence: 63%

Section: Strain Partitioning During Ecapmentioning

confidence: 98%

Section: Strain Partitioning During Ecapmentioning

confidence: 99%

Section: Strain Partitioning During Ecapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Formation of bulk-laminated materials by localized deformation during ECAP of an AA6060 aluminum alloy

Wagner

Frint

2020

MATEC Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

Facing the Issues of Sheet Metal Equal‐Channel Angular Pressing: A Modified Approach Using Stacks to Produce Ultrafine‐Grained High Ductility AA5083 Sheets

et al. 2021

Self Cite

View full text Add to dashboard Cite

A new approach for equal‐channel angular pressing (ECAP) of thin AA5083 sheets using two different orientations is investigated to address the issues of sheet metal ECAP. The method includes the deformation of a stack of 6 individual sheets supported by bulk material pieces placed on both sides of the stack. An excess length of the support materials and their pre‐deformation during an early stage of processing allows a buckling‐free deformation of the thin sheets for one of the investigated orientations. Multiple ECAP passes (up to N = 4) at room temperature following route C and microstructural analyses by electron back‐scatter diffraction are performed. Two passes of ECAP already result in considerable grain refinement with equiaxed grains, pronounced substructures and in an increased tensile strength at room temperature. At elevated temperatures (250 °C) a comparatively large elongation to failure (>130%) is found for the fine‐grained sheets. Diffusion‐controlled deformation mechanisms likely contribute to the deformation behavior of the investigated material. Scanning electron microscopy of the tensile specimens after testing reveals the formation of elongated and large cavities. These results highlight the suitability of the modified experimental method to produce (ultra)fine‐grained thin aluminum sheets with distinctly increased strength and ductility.

show abstract

Evolution Behavior of Shear Band in Al‐0.5Mg‐0.4Si‐0.1Cu Alloy during Hot Compression Process

Wang,

Ding,

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

To clarify the evolution behavior of shear bands in Al‐0.5Mg‐0.4Si‐0.1Cu alloy under high temperature conditions, isothermal compression tests were carried out under 400 °C, 450 °C, and 500 °C with 50% compression at a strain rate of 1s‐1. Through Electron Backscattered Diffraction (EBSD), Schmid factors are mainly distributed between 0.395 and 0.495, making lattices easy to rotate and shear bands formed. The shear band, a local plastic deformation structure, has significant impact on the dynamic recrystallization and preferred orientation of grains. Through the recrystallization distribution maps, subgrains absorb a large amount of dislocations, which increases the grains orientation difference, resulting in the formation of recrystallized grains with high angle grain boundaries. In addition, bulging grain boundaries promote the formation of new nuclei. The newly formed nuclei will generate and grow by absorption of dislocations, which is the feature of discontinuous dynamic recrystallization (DDRX). These two phenomena were further confirmed by Transmission Electron Microscope (TEM) tests. Finally, R‐Cube textures mainly formed in shear bands at 400 °C, while in the matrix E‐textures mainly formed at 400 °C and 450 °C, and R‐Goss textures were rotated to form at 500 °C, which was confirmed by EBSD test results.This article is protected by copyright. All rights reserved.

show abstract

Strain partitioning by recurrent shear localization during equal-channel angular pressing of an AA6060 aluminum alloy

Cited by 41 publications

References 75 publications

Formation of bulk-laminated materials by localized deformation during ECAP of an AA6060 aluminum alloy

Formation of bulk-laminated materials by localized deformation during ECAP of an AA6060 aluminum alloy

Facing the Issues of Sheet Metal Equal‐Channel Angular Pressing: A Modified Approach Using Stacks to Produce Ultrafine‐Grained High Ductility AA5083 Sheets

Evolution Behavior of Shear Band in Al‐0.5Mg‐0.4Si‐0.1Cu Alloy during Hot Compression Process

Contact Info

Product

Resources

About