Recrystallization during Hot Deformation of Aluminium

Gourdet, Sophie; Konopleva, E. V.; McQueen, H.J.; Montheillet, F.

doi:10.4028/www.scientific.net/msf.217-222.441

Cited by 23 publications

(21 citation statements)

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“…Additional analysis (STEM-SADP) of hot deformation microstructures with rising m indicates that deformation bands form containing the subgrains described earlier [177,178,189,228]. In TEM, the disorientation bands appear to be narrow boundaries which are similar to normal SGB but can only be identified by SADP.…”

Section: Polycrystal Constraintsmentioning

confidence: 69%

“…They are characterized by diameter u, an interior dislocation spacing z i − 0.5 and a wall spacing s (related to misorientation q) which were stably tied to deformation conditions: it requires creation of walls, whereas the opposite is slow requiring their annihilation. The continual rearrangement of the SGB maintains at low value (and independent of strain) the wall dislocation spacing and misorientation (B5°) [177,178,184,193,210,222 -227,245], although this is disputed [185,228]. However, permanent disorientation bands which increase in misorientation with rising m have been observed [177,178,189,228].…”

Section: The Ideal Statementioning

confidence: 99%

“…The continual rearrangement of the SGB maintains at low value (and independent of strain) the wall dislocation spacing and misorientation (B5°) [177,178,184,193,210,222 -227,245], although this is disputed [185,228]. However, permanent disorientation bands which increase in misorientation with rising m have been observed [177,178,189,228]. The rate of DRV at a given dislocation density is much greater under an applied stress than in the absence of stress during static recovery SRV.…”

Section: The Ideal Statementioning

confidence: 99%

“…As the stress rises all the average microstructural spacings are decreased which means the extremes of wall densities are much higher with the consequent increase in misorientation [228,236,290]. At the upper end of the warm working range, 0.4-0.5T m , the substructures remain equiaxed and the SGB appear to be ephemeral, thus the walls of higher q likely do not persist.…”

Section: Warm Workingmentioning

confidence: 99%

See 3 more Smart Citations

Current issues in recrystallization: a review

Doherty¹,

Hughes²,

Humphreys³

et al. 1997

Materials Science and Engineering: A

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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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Section: Polycrystal Constraintsmentioning

confidence: 69%

Section: The Ideal Statementioning

confidence: 99%

Section: The Ideal Statementioning

confidence: 99%

Section: Warm Workingmentioning

confidence: 99%

See 2 more Smart Citations

Current issues in recrystallization: a review

Doherty¹,

Hughes²,

Humphreys³

et al. 1997

Materials Science and Engineering: A

Self Cite

2,063

623

View full text Add to dashboard Cite

show abstract

“…The DRX in metals does not occur due to their high stacking fault energy (SFE) and the primary softening mechanism is only dynamic recovery, though exceptions have been made for very high purity aluminum and some alloys containing particles. Although the basis for these exceptions has not been clearly understood, several different dynamic recrystallization mechanisms have been proposed and these include continuous dynamic recrystallization (CDRX) in the initial stages of superplasticity and geometric dynamic recrystallization (GDRX), both of which refine grain size [13][14][15][16][17][18][19][20][21][22]. The CDRX occurs by the continued accumulation of dislocations in subgrain boundaries, leading to the progressive increase of misorientations in subgrains and the formation of high angle boundaries [13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Continuous dynamic recrystallization of AISI 430 ferritic stainless steel

Kim

Yoo

2002

Met. Mater. Int.

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The high-temperature deformation behavior of AISI 430 ferritic stainless steel was studied by torsion tests. The deformation tests were performed in the temperature range of 900-1100 o C and strain rate range of 5.0×10 . In addition, when heavy deformation (>300%) was applied, higher misorientation (~15 o ) was achieved. The tendency of CDRX increased with increasing strain rate and decreasing temperature. The dependence of CDRX grain size on the strain rate and temperature was discussed.

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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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Recrystallization during Hot Deformation of Aluminium

Cited by 23 publications

References 0 publications

Current issues in recrystallization: a review

Current issues in recrystallization: a review

Continuous dynamic recrystallization of AISI 430 ferritic stainless steel

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

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