An Analysis of the Behaviour of Aluminium During a Strain Rate Change

Perdrix, Ch.; Montheillet, F.

doi:10.1016/b978-1-4832-8412-5.50098-9

Cited by 7 publications

(8 citation statements)

References 5 publications

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“…It was observed that the texture often becomes weak after large torsion deformation, similar to that observed in the PM 6061 Al alloy of this study, and in 6061 Al alloy processed by ECAP [34,43]. Furthermore, the effect of rotation of cube orientation on softening is insignificant, although the Taylor's factor due to the evolution of texture during torsion can decrease [44,45]. This effect can contribute only partially to the softening [46,47].…”

Section: Hot Deformation Behaviorsupporting

confidence: 86%

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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Section: Hot Deformation Behaviorsupporting

confidence: 86%

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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“…It was also suggested in [24,25] that the transition of LAGB into HAGB can be controlled by a recovery rate, which is accelerated by higher temperatures [26]. This mechanism has been observed in several high stacking fault energy (SFE) metals, such as aluminum and aluminum alloys [27,28], and ferritic steels, etc. These studies revealed that, at small or medium strains, the microstructure consists of the deformed initial grains containing subgrains.…”

Section: Resultsmentioning

confidence: 99%

Effect of equivalent strain and redundant shear strain on microstructure and texture evolution during hot rolling in Mg–3Al–1Zn alloys

Guo

Fujita

2012

J Mater Sci

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Equivalent strain and redundant shear strain distribution in the roll bite during normal rolling were calculated by a numerical integration method combined with the experimental method. The microstructural parameters, such as length of high-angle grain boundaries (HAGB), length of low-angle grain boundaries (LAGB) per unit area, and (0002) basal texture in surface layer and center layer were measured quantitatively by EBSD or X-ray diffraction. The effect of equivalent strain and redundant shear strain on the microstructure and (0002) basal texture evolution in AZ31 alloy during hot rolling were examined. As a result, it was found that the formation of the HAGB depends on the equivalent strain, while the formation of the LAGB is strongly affected by the redundant shear strain, which restrains the formation of the LAGB. The experimental results also suggest that the redundant shear may have little effect on improving DRX and weakening the (0002) basal texture intensity when the redundant shear strain is in small to moderate range (B0.8).

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“…The main mechanism of grain boundary formation during plastic deformation in materials with high stackingfault energy (SFE) is continuous conversion of low angle boundaries into high angle ones [1,2] through CDRX. This type of structure evolution has often been observed in minerals [3] and metals [4][5][6]. However, although the experimental observations of structural evolution in these works were quite detailed, some important aspects of CDRX remain unclear.…”

Section: Introductionmentioning

confidence: 88%

“…It was assumed [1] that the stability of subgrain structure in multiphase materials was mainly caused by pinning of boundaries by second-phase particles. However, this assumption is unable to explain CDRX occurrence in single-phase materials, such as NaCl [3] or pure Al [4]. From this point of view it is interesting to consider the microstructural evolution in a pure high SFE material in details.…”

Section: Introductionmentioning

confidence: 99%

Fine-grained structure formation in LiF single crystals during compression at intermediate temperature

Sitdikov¹

2013

LoM

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сверхпластичности металлов РАН, ул. Халтурина 39, 450001 г. Уфа 2 Башкирский государственный университет, ул. Валиди, 32, 450076 г. Уфа The microstructural evolution and a character of dislocation glide have been examined in <100> oriented LiF single crystals at 673 K by means of optical microscopy and X-ray analysis. It has been shown that the continuous dynamic recrystallization (CDRX) results in the formation of recrystallized grains. Localization of dislocation glide plays an important role in CDRX providing the formation of separate band-like subgrains after small strain. Longitudinal boundaries of such bands exhibit low migrating ability that prevents collision and following mutual annihilation of subboundaries of opposite signs. As a result, highly stable arrays of low-angle boundaries are formed. Further plastic deformation, leading to continuous increase in misorientation of subboundaries and their eventual conversion into high angle ones, results in the formation of recrystallized grains.

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An Analysis of the Behaviour of Aluminium During a Strain Rate Change

Cited by 7 publications

References 5 publications

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

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

Effect of equivalent strain and redundant shear strain on microstructure and texture evolution during hot rolling in Mg–3Al–1Zn alloys

Fine-grained structure formation in LiF single crystals during compression at intermediate temperature

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