Effect of deformation temperature on microstructure evolution in aluminum alloy 2219 during hot ECAP

Mazurina, I.; Sakai, Taku; Miura, Hiromi; Sitdikov, Oleg; Kaibyshev, Rustam

doi:10.1016/j.msea.2007.09.070

Cited by 113 publications

(108 citation statements)

References 21 publications

(49 reference statements)

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“…on Al-2219 results in θ values that saturate at about 25 to 30º in the SPD regime [93], and for Al-6% Mg-0.3% Sc-0.4% Mn processed at 300ºC similar saturation values for θ were found [94]. It is also relevant to point out that whilst at low strains (<<1) only a small fraction of atom bonds have been broken by the passing of dislocations, the SPD regime (ε>3) is characterised by a cumulative number of bond breaking events that is larger than the total number of bonds in the lattice.…”

Section: Aspects Of Grain Boundary Evolution Not Included In the Presmentioning

confidence: 96%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions.These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of nonshearable particles on the grain refinement during SPD.

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Section: Aspects Of Grain Boundary Evolution Not Included In the Presmentioning

confidence: 96%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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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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“…Chen et al [10] studied the influences of different aging states on the friction stir welding of 2219 aluminum alloy plate, and found out that the strength coefficient of O-style plate was much higher than that of T6 alloy plate. Mazurina et al [11], with channel angular pressing method, studied the influences of the deformation temperature from 250 to 475 • C on the changes of 2219 aluminum alloy's microscopic structures.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different External Fields on Aging Kinetics of 2219 Aluminum Alloy

Zhan

et al. 2016

Metals

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Abstract:By undertakig an aging experiment on 2219 aluminum alloy under different external field and by the method of hardness test, a comparative study on the kinetics of aging generated under different external fields was conducted. Furthermore, the time-temperature-transformation curves (TTT curve) were obtained, and the microstructure and mechanical property of the alloy under the effect of different external fields were tested. Results indicated that the effect of magnetic field postponed the alloy's aging precipitation process, and slightly reduced its mechanical property; the effects of electric field accelerated the alloy's aging precipitation, increased its mechanical property and made the precipitated phase of alloy smaller and diffused. In addition, through analysis, it was concluded that the performance of the specimen was even more balanced under the effect of electromagnetic field.

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Effect of deformation temperature on microstructure evolution in aluminum alloy 2219 during hot ECAP

Cited by 113 publications

References 21 publications

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

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

The Influence of Different External Fields on Aging Kinetics of 2219 Aluminum Alloy

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