Textures in a superplastic Al-6Cu-0.3Zr alloy

Bricknell, R.H.; Edington, J. W.

doi:10.1016/0001-6160(79)90199-8

Cited by 57 publications

(28 citation statements)

References 15 publications

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“…However, several investigations based on texture analysis have emerged throughout this decade in which a prominent role of slip during superplastic deformation is reported (Melton et al, 1974;Bricknell and Edington, 1979;Tsuzaki et al, 1990;Qing et al, 1992;Blackwell and Bate, 1993;Liu and Chakrabarti, 1996). A similar behavior has been recently observed by the present authors in A1-5%Ca-5%Zn when tested along the transverse direction (P6rez-Prado et al, 1996;1998).…”

Section: Introductionsupporting

confidence: 86%

“…Several investigators have reported the stabilization of c and / texture components during superplastic deformation (Melton et al, 1974;Bricknell and Edington, 1979;Tsuzaki et al, 1990;Qing et al, 1992;Blackwell and Bate, 1993;Liu and Chakrabarti, 1996;P6rez-Prado et al, 1996;1997;1998;P6rez-Prado and Gonzfilez-Doncel, 1999) as well as the apparent simultaneous operation ofboth CS and GBS during deformation (Melton et al, 1974;Bricknell and Edington, 1979;P6rez-Prado et al, 1996;1997;1998;P6rez-Prado and Gonzfilez-Doncel, 1999 (Humphreys, 1997). The geometric models for uniaxial deformation, however, usually assume a starting random texture.…”

Section: Discussionmentioning

confidence: 99%

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Study of the Deformation Mechanisms of the Superplastic Alloy Ai–Li 2090 by Texture Analysis

Pérez‐Prado

Cristina

Ruano

et al. 2000

Texture, Stress, and Microstructure

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The deformation mechanisms ofa superplastic A1-Li 2090 alloy have been investigated by means of texture analysis. It has been found that both crystallographic slip (CS) and grain boundary sliding (GBS) operate in response to the applied stress over a wide range of deformation, conditions. This is in contrast to well-accepted creep models, which predict that only one mechanism should operate and that the transition from one mechanism to another is abrupt and takes place over a narrow range of deformation conditions. Additionally, according to geometric (Taylor-type) models of uniaxial deformation for CS, the (110), (111), or (001) fibers should appear when 4, 6, or 8 slip systems operate. Here, however, CS contributes to stabilize orientations belonging to the a and /3 fibers.

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Section: Introductionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Study of the Deformation Mechanisms of the Superplastic Alloy Ai–Li 2090 by Texture Analysis

Pérez‐Prado

Cristina

Ruano

et al. 2000

Texture, Stress, and Microstructure

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“…28 provides microstructural and microtextural data illustrating the evolution of grain boundary structure during annealing and deformation of as-processed SUPRAL 2004. This alloy (nominally Al -6wt.%Cu -0.4wt.%Zr) has been extensively studied and reported to exhibit dynamic continuous recrystallization resulting in a microstructure sufficient to support extensive superplastic flow during elevated temperature deformation [165,166,[171][172][173]. Of particular interest here are the effects of annealing and deformation on the low-angle (0 -5°misorienta-tion) and moderately misoriented (5 -15°misorienta-tion) boundaries developed during the thermomechanical processing of this material.…”

Section: Discussionmentioning

confidence: 99%

Current issues in recrystallization: a review

Doherty¹,

Hughes²,

Humphreys³

et al. 1997

Materials Science and Engineering: A

2,063

623

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The current understanding of the fundamentals of recrystallization is summarized. This includes understanding the as-deformed state. Several aspects of recrystallization are described: nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recrystallization, particle effects, and texture. This article is authored by the leading experts in these areas. The subjects are discussed individually and recommendations for further study are listed in the final section. © 1997 Elsevier Science S.A.

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“…[27,57,72,94,95] Continuous DRX has been found in alloys such as Al-Cu-Zr (supral) and Al-10Mg-Zr (or -Cr, -Mn), which have been predeformed at a high Z level (ϳ300 ЊC) after a suitable dispersion of pinning particles has been established by heat treatment. [14,15,79,80,[134][135][136] Such (b) DRX takes place upon straining at a low Z level (ϳ10 Ϫ3 s 1 and ϳ500 ЊC) in the initial stage of superplastic deformation. The high-dislocation walls stretching between the pinning particles transform into grain boundaries, which are mobile (except for the particles) and capable of sliding to impart superplastic behavior.…”

Section: Dislocation Substructurementioning

confidence: 99%

Elevated-temperature deformation at forming rates of 10−2 to 102 s−1

McQueen

2002

Metall Mater Trans A

124

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In the hot working at constant strain rate () of Al and ␣ Fe alloys at 0.5 to 0.9 T M (absolute melting temperature), steady-state deformation is achieved in similarity to creep, which is usually at constant stress. After an initial strain-hardening transient, the flow stress becomes constant in association with a substructure which remains equiaxed and constant in the spacing of sub-boundaries and of dislocations in both walls and subgrains. All these spacings become larger at higher temperature (T ) and lower values as well as with lower stress, being fully consistent with the relationships established in creep. Because hot working can proceed to a much higher true strain in torsion (ϳ100) and compression (ϳ2) as well as in extrusion (ϳ20) and rolling (ϳ5), it is possible to confirm that grains continue to elongate while the subgrains within them remain equiaxed and constant in size. When the thickness of grains reaches about 2 subgrain diameters (d s ), the grain boundaries with serrations (ϳd s ) begin to impinge and the grains pinch off, becoming somewhat indistinguishable from the subgrains; this has been called geometric dynamic recrystallization (DRX). In polycrystals as at 20 ЊC, deformation bands form and rotate during hot working according to the Taylor theory, developing textures very similar to those in cold working. In metals of lower dynamic recoverability such as Cu, Ni, and ␥ Fe, new grains nucleate and grow (discontinuous DRX), leading to a steady state related to frequently renewed equiaxed grains, containing an equiaxed substructure that develops to a constant character and defines the flow stress.

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Textures in a superplastic Al-6Cu-0.3Zr alloy

Cited by 57 publications

References 15 publications

Study of the Deformation Mechanisms of the Superplastic Alloy Ai–Li 2090 by Texture Analysis

Study of the Deformation Mechanisms of the Superplastic Alloy Ai–Li 2090 by Texture Analysis

Current issues in recrystallization: a review

Elevated-temperature deformation at forming rates of 10−2 to 102 s−1

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