Continuous dynamic recrystallization in an Al–Li–Mg–Sc alloy during equal-channel angular extrusion

Кайбышев, Р. О.; Shipilova, K.; Musin, Fanil; Motohashi, Yoshinobu

doi:10.1016/j.msea.2005.01.053

Cited by 226 publications

(165 citation statements)

References 36 publications

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“…In general, the microstructure appeared to be completely recrystallized for all of the cases studied. This observation was in agreement with previous studies of friction-stirred AlMg-Sc alloys [11,12,23,31,35].…”

Section: Friction-stir Weldssupporting

confidence: 94%

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Malopheyev

Kulitskiy

Mironov

et al. 2014

Materials Science and Engineering: A

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. b s t r a c tThe effect of prior work hardening on the microstructure and mechanical properties of a friction-stir welded (FSWed) Al-5.4Mg-0.2Sc-0.1Zr alloy was investigated. The microstructure of the final stir zone was shown to be weakly dependent on the initial condition of the base material; FSW led to the formation of fully recrystallized microstructures with average grain sizes ranging from 1.2 to 1.5 μm and a moderate dislocation density of $ 3.57 1.5 Â 10 13 m À 2 in the stir zone. The nano-scale Al 3 (Sc,Zr) dispersoids coarsened from 9 to $ 15 nm but retained a coherent relationship with the matrix. In contrast, the joint efficiency of the obtained welds was very sensitive to the initial material condition. Nearly full strength joints were obtained in both annealed (O) and partially hardened and stabilized (H323) conditions. However, the joint efficiency was only 65% in the fully hardened condition (H18). The relatively low weld strength for the alloy in the H18 condition was attributed to the elimination of dislocation and substructure strengthening during FSW.

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Section: Friction-stir Weldssupporting

confidence: 94%

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Malopheyev

Kulitskiy

Mironov

et al. 2014

Materials Science and Engineering: A

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“…The fourth route of TMP can be applied to materials such as Weldalite (AA2X95) alloy [16], in which normal grain growth took place; increase in grain size under solution treatment is insignificant. Therefore, it is reasonable to apply the fourth route of TMP only to Sc-bearing aluminum alloys, in which coherent Al 3 Sc dispersoids effectively suppress the migration of HAGBs under conditions of solution treatment that retains a UFG structure evolved under prior ECAP [2,29,30]. It was found that a 9% increase in YS of Al-Li alloys processed through this TMP route could be achieved [16].…”

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Abstract:The effect of post-deformation solution treatment followed by water quenching and artificial aging on microstructure and mechanical properties of an Al-Li-Mg-Sc-Zr alloy subjected to equal-channel angular pressing (ECAP) was examined. It was shown that the deformed microstructure produced by ECAP remains essentially unchanged under solution treatment. However, extensive grain refinement owing to ECAP processing significantly affects the precipitation sequence during aging. In the aluminum-lithium alloy with ultrafine-grained (UFG) microstructure, the coarse particles of the S 1 -phase (Al 2 LiMg) precipitate on high-angle boundaries; no formation of nanoscale coherent dispersoids of the δ -phase (Al 3 Li) occurs within grain interiors. Increasing the number of high-angle boundaries leads to an increasing portion of the S 1 -phase. As a result, no significant increase in strength occurs despite extensive grain refinement by ECAP.

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“…There is an agreement that the grain fragmentation in Al and Al alloys processed by different thermomechanical routes, such as torsion, compression, ECAP, or HPT is usually accompanied by a decrease of the initial texture, and an increase of the average misorientation between neighbors; low angle boundaries gradually transform into high angle boundaries [49,50,41]. Nevertheless, there is a difference in the strain conditions for the onset of the formation of the new substructure, at least under torsion deformation conditions.…”

Section: Hot Deformation Behaviormentioning

confidence: 98%

“…The same tendency was observed in materials processed by ECAP and HPT. For example, small grains of about 0.9 and 1.2 m were developed in Al-Li and Al-Cu alloys deformed by ECAP up to strain 12 via route A at 300 and 250 • C, respectively [49,50]. Also, ultrafine grains of 0.25 m in size were developed under HPT after 20 turns at room temperature [33].…”

Section: Hot Deformation Behaviormentioning

confidence: 99%

Microstructure gradient after hot torsion deformation of powder metallurgical 6061 Al alloy

Eddahbi

Borrego

Monge

et al. 2012

Materials Science and Engineering: A

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Abstract:The microstructure and the texture of extruded 6061 Al alloy processed by powder metallurgy (PM), using three different initial powder particle sizes, have been studied after torsion deformation at 300 • C at strain rate of 6 s −1 . The initial extruded microstructure of the three alloys consisted of elongated grains confining substructure with a typical 1 1 1 + 1 0 0 fiber texture. After torsion deformation, the torque ( ) as a function of the equivalent strain (ε eq ) showed softening and the microstructure exhibited a gradient across the section so that the inner and outer zones contained sheared-elongated and small-equiaxed subgrains, respectively. It was observed that the equivalent strain to failure for the material processed using powder particles size of less than 45 m was of about ε eq ∼ 12, compared to ε eq ∼ 1 for material processed using powder particles size of less than 25 m. The microstructural changes during hot torsion deformation of PM 6061 Al alloy should involve continuous dynamic processes.

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Continuous dynamic recrystallization in an Al–Li–Mg–Sc alloy during equal-channel angular extrusion

Cited by 226 publications

References 36 publications

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Microstructure gradient after hot torsion deformation of powder metallurgical 6061 Al alloy

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