Dynamic ageing and the mechanical response of Al–Mg–Si alloy through equal channel angular pressing

Vaseghi, Majid; Taheri, Ali; Hong, Sun Ig; Kim, Hyoung Seop

doi:10.1016/j.matdes.2010.04.056

Cited by 44 publications

(15 citation statements)

References 28 publications

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“…[31] Similarly, dynamic aging of AA6061 during ECAP caused the highest increase in hardness. [28] The aluminum alloys from 6xxx series are precipitation hardenable. It was proved that very high mechanical strength can be obtained by combining SPD processes also with post-processed aging treatment.…”

Section: B Improvement In Mechanical Propertiesmentioning

confidence: 99%

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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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Section: B Improvement In Mechanical Propertiesmentioning

confidence: 99%

“…There are plenty of studies about SPD processing of Al-Mg-Si alloys, such as ECAP [27][28][29] or high pressure torsion (HPT). [30][31][32] However, the main emphasis is placed on the combination of grain boundaries strengthening with an age hardening [27,33] or optimizing mechanical and electrical properties by applying aging process.…”

Section: Introductionmentioning

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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“…Dynamic precipitation is much more promising in terms of hardness enhancement. Kim et al [18] showed a remarkable increase in strength on Al 6061 after four ECAP passes at 100 1C, but a minimum DH of only 15 was obtained.…”

Section: Introductionmentioning

confidence: 98%

“…grain-size reduction by deformation and precipitation hardening by aging). For example, pre-ECAP aging, dynamic aging and post-ECAP aging are examples of alternative choices that are carried out in combination with multi-pass or single pass ECAP [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Homogenization of ECAPed Al 2024 alloy through age-hardening

Kotan¹,

Tan²,

Kalay³

et al. 2013

Materials Science and Engineering: A

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“…12 Among aluminum alloys, AA6061 has received great interest as one of the materials for the automobile, aerospace and construction industries. 13 Incidentally, there are only few reports on the hot ductility of ultrafine-grained AA6061 alloy, and thus, this study pursues three aims. First, the combination of the ECAP and CR techniques was used to produce large ultrafine-grained strips for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Hot Ductility of AA6061 Aluminum Alloy After Severe Plastic Deformation

Khamei

Dehghani

Mahmudi

2015

JOM

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Solutionized AA6061 aluminum alloy was processed by equal-channel angular pressing followed by cold rolling. The hot ductility of the material was studied after severe plastic deformation. The hot tensile tests were carried out in the temperature range of 300-500°C and at the strain rates of 0.0005-0.01 s À1 . Depending on the temperature and strain rate, the applied strain level exhibited significant effects on the hot ductility, strain-rate sensitivity, and activation energy. It can be suggested that the possible mechanism dominated the hot deformation during tensile testing is dynamic recovery and dislocation creep. Constitutive equations were developed to model the hot ductility of the severe plastic deformed AA6061 alloy.

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Dynamic ageing and the mechanical response of Al–Mg–Si alloy through equal channel angular pressing

Cited by 44 publications

References 28 publications

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

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

Homogenization of ECAPed Al 2024 alloy through age-hardening

Modeling the Hot Ductility of AA6061 Aluminum Alloy After Severe Plastic Deformation

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