Dynamic restoration mechanisms in Al-5.8 At. Pct Mg deformed to large strains in the solute drag regime

Henshall, G.A.; Kassner, M.E.; McQueen, H.J.

doi:10.1007/bf02675565

Cited by 116 publications

(60 citation statements)

References 26 publications

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“…Our observations of subgrain formation are similar to those of binary Al-Mg alloys in torsion [13] and compression [14] in the solute-drag regime. However, since the maximum achievable strain in tensile mode is considerably lower, the grains do not thin to such an extent that socalled geometric dynamic recrystallization [37] becomes relevant.…”

supporting

confidence: 81%

“…Dynamic reconstruction in coarse-grained Al-Mg alloys is often evidenced by extensive grain refinement, which is attributed to the formation of subgrain boundaries and their conversion into lowangle and high-angle grain boundaries. This evolution of the microstructure in the solute-drag regime has been studied in detail in torsion [13] and compression [14] modes, but less in tension.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and reconstruction mechanisms in coarse-grained superplastic Al–Mg alloys

2006

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This paper concentrates on the superplastic response of fine-grained and coarse-grained Al-Mg alloys under uniaxial tension. To identify the main characteristics of superplastic deformation and to determine the optimum deformation parameters, the microstructure and dislocation substructure of the alloys are analyzed as a function of strain, strain rate and temperature using electron backscatter diffraction and transmission electron microscopy (TEM). Under optimum deformation conditions of temperature and strain rate, these Al-Mg alloys have an elongation to failure in excess of 300%. Dynamic recrystallization is dominant at strain rates in excess of 10 À1 s À1 and results in a strong coarsening of the microstructure and premature failure. Dynamic recovery prevails at a strain rate of around 10 À2 s À1 , leading to great enhancement of the plasticity of the coarse-grained materials. TEM observations show that subgrain formation proceeds slowly. During initial straining, subgrains are formed primarily along the original grain boundaries. This results in a ''core and mantle'' microstructure, with dynamic recovery mainly taking place in the mantle region. A uniform substructure is established at a strain of the order of 1.

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supporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Deformation and reconstruction mechanisms in coarse-grained superplastic Al–Mg alloys

2006

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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%

“…5) cannot be explained in terms of discontinuous or geomet-ric dynamic recrystallization. This is because neither signal of grain boundary migration nor serrated grain boundaries are observed in the deformed microstructures [37][38][39][40][41]. Moreover, deformation shear bands associated with adiabatic heating are not observed under the testing conditions of this study, which generally should produce softening [42].…”

Section: Hot Deformation Behaviormentioning

confidence: 70%

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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“…(see also [65,66]). In order to directly observe the evolution of dislocation structures during superplastic deformation, the coarsegrained Al-Mg alloys were subjected to in-situ TEM tensile experiments at elevated temperature in a TEM.…”

Section: In Situ Tem Straining and Heating: Superplasticitymentioning

confidence: 96%

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

Hosson

Yasuda

2007

Springer Series in Materials Science

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In the field of transmission electron microscopy fundamental and practical reasons still remain that hamper a straightforward correlation between microscopic structural information and self healing mechanisms in materials. We argue that one should focus in particular on in situ rather than on postmortem observations of the microstructure. In this contribution this viewpoint has been exemplified with in situ TEM nanoindentation and in situ straining studies at elevated temperatures of metallic systems that are strengthened by either solid solution or antiphase boundaries in intermetallic compounds. It is concluded that recent advances in in situ transmission electron microscopy can provide new insights in the interaction between dislocations and interfaces that are relevant for self healing mechanisms in metallic systems.

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Dynamic restoration mechanisms in Al-5.8 At. Pct Mg deformed to large strains in the solute drag regime

Cited by 116 publications

References 26 publications

Deformation and reconstruction mechanisms in coarse-grained superplastic Al–Mg alloys

Deformation and reconstruction mechanisms in coarse-grained superplastic Al–Mg alloys

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

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

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