Plastic anisotropy of ultrafine grained aluminium alloys produced by accumulative roll bonding

Beausir, Benoît; Scharnweber, Juliane; Jaschinski, J.; Brokmeier, Heinz Günter; Oertel, C.‐G.; Skrotzki, Werner

doi:10.1016/j.msea.2010.02.006

Cited by 58 publications

(25 citation statements)

References 25 publications

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“…[21][22][23][24][25] This approach was also developed using the accumulative roll bonding (ARB) process 26 but the essential drawback of the processed metal plate after ARB involves the anisotropic mechanical response which is dependent upon the rolling direction and the through-thickness direction. 27 A very recent report demonstrated a solid-state reaction in an Al-Cu system through the bonding of semicircular halfdisks of Al and Cu through HPT at ambient temperature for up to 100 turns 28 and the vision of architecturing hybrid metals through HPT was discussed using computational calculations. 29 Accordingly, the present research was initiated to examine the alternative possibility of achieving direct diffusion bonding of Al and Mg disks through conventional HPT processing for a short period of time.…”

Section: Introductionmentioning

confidence: 99%

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

et al. 2015

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Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al-Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic b-Al 3 Mg 2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.

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Section: Introductionmentioning

confidence: 99%

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

et al. 2015

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“…Similar to FLDs, the majority of investigations on plastic anisotropy and deep drawing behavior of UFG metals are focusing on aluminum alloys, most of them using either ARB or ECAP . In the following, the anisotropy parameters of SPD processed metals will be addressed before going into details on the few deep drawing experiments that have been published so far.…”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

“…In the subsequent cycle, the shear‐deformed surface is transferred to the center of the sheet where the deformation mode is approximately plane strain compression as in conventional rolling. This leads to a transient texture that is heterogeneous through the thickness of the sheet, which complicates modeling approaches (e.g., viscoplastic polycrystal self‐consistent models) based on average textures as shown in the work by Beausir et al They investigated the plastic anisotropy of two aluminum alloys (AA1050 and AA6016) processed by ARB as a function of the number of cycles, showing that the average normal anisotropy < r > slightly increases with the number of ARB cycles. The planar anisotropy Δ r decreases with the number of ARB cycles, yet, due to a change of sign, its magnitude is larger after 6 and 8 cycles as compared to the condition prior to ARB …”

Section: Formability Under Different Loading Scenariosmentioning

confidence: 99%

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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“…Furthermore, ARB causes significant anisotropy of mechanical properties. [75] Finally, one of the most important drawbacks is the fracture of deformed materials. Especially at higher cycles, edge cracks occur, which propagate into the center of the sheet.…”

Section: Fabrication Of Ufg Plates and Sheetsmentioning

confidence: 99%

Ultrafine-Grained Plates of Al-Mg-Si Alloy Obtained by Incremental Equal Channel Angular Pressing: Microstructure and Mechanical Properties

Lipińska

Chromiński

Olejnik

et al. 2017

Metall Mater Trans A

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In this study, an Al-Mg-Si alloy was processed using via incremental equal channel angular pressing (I-ECAP) in order to obtain homogenous, ultrafine-grained plates with low anisotropy of the mechanical properties. This was the first attempt to process an Al-Mg-Si alloy using this technique. Samples in the form of 3 mm-thick square plates were subjected to I-ECAP with the 90 deg rotation around the axis normal to the surface of the plate between passes. Samples were investigated first in their initial state, then after a single pass of I-ECAP, and finally after four such passes. Analyses of the microstructure and mechanical properties demonstrated that the I-ECAP method can be successfully applied in Al-Mg-Si alloys. The average grain size decreased from 15 to 19 lm in the initial state to below 1 lm after four I-ECAP passes. The fraction of high-angle grain boundaries in the sample subjected to four I-ECAP passes lay within 53 to 57 pct depending on the examined plane. The mechanism of grain refinement in Al-Mg-Si alloy was found to be distinctly different from that in pure aluminum with the grain rotation being more prominent than the grain subdivision, which was attributed to lower stacking fault energy and the reduced mobility of dislocations in the alloy. The ultimate tensile strength increased more than twice, whereas the yield strength was more than threefold. Additionally, the plates processed by I-ECAP exhibited low anisotropy of mechanical properties (in plane and across the thickness) in comparison to other SPD processing methods, which makes them attractive for further processing and applications.

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Plastic anisotropy of ultrafine grained aluminium alloys produced by accumulative roll bonding

Cited by 58 publications

References 25 publications

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

Using high-pressure torsion to process an aluminum–magnesium nanocomposite through diffusion bonding

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

Ultrafine-Grained Plates of Al-Mg-Si Alloy Obtained by Incremental Equal Channel Angular Pressing: Microstructure and Mechanical Properties

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