Experimental evaluation of forming limit diagram and mechanical properties of nano/ultra-fine grained aluminum strips fabricated by accumulative roll bonding

Rahmatabadi, Davood; Hashemi, Ramin

doi:10.3139/146.111566

Cited by 45 publications

(35 citation statements)

References 60 publications

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“…Similar results have been observed for an ECAP processed AA6111 aluminum alloy sheet by Lapovok et al that shows a decrease in biaxial formability after the first ECAP pass, whereas a second ECAP pass does not lead to a further reduction but a recovery of formability. An improving formability with increasing number of ECAP or ARB passes has also been observed in tensile tests on many materials and there are several explanations in literature, for example, a more homogeneous strain distribution due to grain refinement, recovery caused by local heating during the process, an increased generation and annihilation of dislocations at grain boundaries, or texture effects . In contrast to the results above, Rahimi et al have reported a continuously decreasing formability of a AA5083 grade aluminium alloy processed by a sheet ECAP (or equal‐channel angular rolling, ECAR) process with 1–3 passes using a die angle of 130°.…”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 91%

“…The diagram in Figure shows a major strain to failure of approx. 20% under uniaxial tension for commercially pure aluminum subjected to seven ARB cycles, whereas the uniform elongation in tensile tests of the same material amounts to only a few percent . This certainly is a worst‐case scenario in terms of stress state regarding the self‐stabilization of strain localizations, which is less of an issue under equi‐biaxial tension or tension‐compression as will be shown in the following sections.…”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 94%

“…These diagrams show either the point of fracture or the onset of necking as a function of the major and minor in‐plane strain components, typically covering the range from uniaxial tension to equi‐biaxial tension. So far, there are only few publications providing FLDs of UFG metals, most of them using aluminum alloys . Figure shows the typical Nakazima test specimens and a resulting FLD for commercially pure aluminum processed by ARB with various cycles .…”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

“…So far, there are only few publications providing FLDs of UFG metals, most of them using aluminum alloys . Figure shows the typical Nakazima test specimens and a resulting FLD for commercially pure aluminum processed by ARB with various cycles . Compared to the annealed condition, the formability drops substantially after the first ARB cycle but increases with every subsequent cycle, yet, remaining below the level of the annealed condition.…”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

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Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

Bruder

2018

Adv Eng Mater

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Severe plastic deformation (SPD) techniques have attracted considerable attention due to their capability to refine the grain size of metals and alloys down to the ultrafine grained (UFG) regime. A characteristic feature of SPD processes is that they generate semi-finished parts such as rods or sheets, which require further shaping in order to become marketable products. One approach for the shaping of SPD processed materials is the use of metal forming processes, which can be a challenge with regard to the low work hardening rate and tendency to strain localizations of most UFG metals. This article summarizes the current state of knowledge on the formability and forming behavior of UFG metals under different loading scenarios, discussing both limitations and application potential. Furthermore, the interaction between microstructural aspects and the formability, such as the occurrence of strain localizations during and the role of heat treatments are also addressed. Given that the formability of UFG metals has received far less attention than other aspects so far, this work also aims at identifying apparent contradictions as well as scientific and technological questions that need to be addressed in future to expand the current knowledge of the field.

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Section: Formability Under Different Loading Scenariosmentioning

confidence: 91%

Section: Formability Under Different Loading Scenariosmentioning

confidence: 94%

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

See 2 more Smart Citations

Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

Bruder

2018

Adv Eng Mater

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“…Aluminum alloy 5083 uses further in the construction of pressure vessels, submarines, rocket components, and transportation equipment [1]. Recently, investigation of production methods and mechanical properties of materials with nanometer grain size or ultrafine-grained materials (UFG), has been the subject of many studies in the field of materials science [2]. The severe plastic deformation (SPD) process has been considered as one of the methods for producing materials with nanometer grain size [3,4].…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the mechanical properties and forming limit diagram of Al 5083 produced by equal channel angular rolling

Bozcheloei

Sedighi

Hashemi

2019

Int J Adv Manuf Technol

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The primary purpose of this research is investigating the effect of increasing temperature on mechanical properties and formability of Al 5083 produced by equal channel angular rolling (ECAR) process. The present work also aims to study the feasibility of increasing temperature as an approach for solving the ductility problem of ultrafine-grained Al 5083, although some strength of the material might be sacrificed. So, the quantitative and qualitative analysis of the effect of temperature increase on mechanical properties and formability has been done. In this paper, the ECAR process has been performed at three different temperatures (i.e., 25℃, 200℃, and 300℃). Then, the investigation of mechanical properties such as yield strength, ultimate tensile strength, and micro-hardness after each pass of the ECAR at different temperatures has been performed. The results showed that by applying the ECAR process at a specified temperature, the mechanical and micro-hardness properties of the samples improved, while elongation to fracture reduced. At ambient temperature, and after the 3 rd pass of the ECAR process, yield strength, ultimate tensile strength, and micro-hardness compared to the annealed sample increased by 94%, 19%, and 52%, respectively. Also, the mechanical properties of samples after the ECAR process in a specified pass at different temperatures have been evaluated. The obtained results showed that by increasing temperature, the yield strength, ultimate tensile strength and micro-hardness of the samples decreased, but the elongation to fracture as well as the forming limit diagram (FLD) improved. The results illustrated that by applying the ECAR process at a specified temperature, the level of the FLDs moved downward. Also, the FLDs after the 3 rd pass of the ECAR at different temperature have been compared. The results showed that the FLD0 (the major forming limit strain in-plane strain mode) at a temperature of 200℃ and 300℃ compared to the ambient temperature increased by 5% and 20%, respectively.

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Ultrafine‐Grained Plates and Sheets: Processing, Anisotropy and Formability

2019

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Herein, the processing, anisotropy and formability of ultrafine‐grained (UFG) plates or sheets processed by various severe plastic deformation (SPD) methods are discussed. The methods capable of processing material in the form of sheets or plates are presented; these include accumulative roll bonding, different kinds of equal channel angular pressing and hybrid methods that combine SPD and conventional techniques. Their impact on microstructural features and mechanical properties, crystallographic textures and formability is discussed. Additionally, some examples of post‐SPD‐shaped materials are presented.

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Experimental evaluation of forming limit diagram and mechanical properties of nano/ultra-fine grained aluminum strips fabricated by accumulative roll bonding

Abstract: Experimental evaluation of forming limit diagram and mechanical properties of Nano/ultra-fine grained Aluminum strips fabricated by accumulative roll bonding process.

Cited by 45 publications

References 60 publications

Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

Formability of Ultrafine Grained Metals Produced by Severe Plastic Deformation–An Overview

The effect of temperature on the mechanical properties and forming limit diagram of Al 5083 produced by equal channel angular rolling

Ultrafine‐Grained Plates and Sheets: Processing, Anisotropy and Formability

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