The development of the deformation texture in zirconium during rolling in sequential passes

Tenckhoff, E.

doi:10.1007/bf02661811

Cited by 70 publications

(25 citation statements)

References 11 publications

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“…The former gives a dominant component close to the ND [ Fig. (6a)], a texture which closely resembles the one reported by Tenckhoff [22] for rolled zirconium. The PTR scheme gives a much less defined texture with no resemblance to the experimental ones [ Fig.…”

Section: Rolling Texturessupporting

confidence: 81%

A model for texture development dominated by deformation twinning: Application to zirconium alloys

Tomé¹,

Lebensohn²,

Kocks³

1991

Acta Metallurgica et Materialia

572

200

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AIwlraet--In many polycrystals of less than cubic crystal symmetry, plastic deformation is dominated by twinning. In particular, we will treat the case of Zr and Zr alloys in detail. We propose a new method for modelling grain reorientation due to twinning, which is based on a Volume Fraction Transfer (VFT) scheme; the scheme is also applied to the slip modes. We find that this method predicts textures that are, when twinning is the dominant mode, considerably different from, and in better agreement with experiment than the conventional schemes which reorient an entire grain when some criterion has been met. Various combinations of slip and twinning modes and of the associated critical stresses are systematically investigated for the case of rolling, tension and compression of Zr alloys. A comparison of various predicted and experimental textures leads to the conclusion that twinning must, indeed, be controlling texture development.R/~t---Dans de nombreux polycristaux ayant une sym6trie inf6rieure a la sym6trie cubique, la dfformation plastique est domin6e par le maclage. En particulier, nous traitons en d6tail le cas du zirconium et des alliages de zirconium. Nous proposons une nouvelle m6thode pour mod61iser la r6orientation des grains due au maclage, m6thode qui est bas6e sur le concept de transfert de la fraction volumique (TFV); la m~thode est aussi appliqu6e aux modes de glissement. Nous trouvons que la m6thode pr6voit des textures qui, lorsque le maclage pr6domine, sont consid6rablement diff6rentes et en meiUeur accord avec rexp6rience que les sch6mas traditionnels qui r6orientent un grain entier lorsque qu'un certain crit~re est satisfait. On 6tudie syst6matiguement les diverses combinaisons de glissement et de maclage ainsi que les diverses combinaisons des contraintes critiques associ6es dans le cas du laminage, de la traction et de la compression des alliages de Zr. Une comparaison des diverses textures pr6vues et exp~rimentales conduit ~ la conclusion que la maclage dolt, en v6rit6, contrgler le d6veloppement de la texture.Zmmnmeafasaang--ln vielen Polykristallen von Materialien mit weniger als kubischer Symmetrie ist die plastische Verformung gepr~gt yon ZwiUingsbildung. Insbesondere behandeln wir hier den Fall des Zirkons und seiner Legierungen ausffihrlich. Wit schlagen eine neue Methode zur modeUhaften Beschreibung der Kornumorientierung durch Zwillingsbildung vor; die Methode beruht auf dem Verfahren der 'Obertragung des Volumanteils', mit dem auch die Gleitmoden beschrieben werden k6nnen. Diese Methode sagt Texturen voraus, die fiir den Fall, dal3 Zwillingsbildung vorherrscht, besser mit dem Experiment fibereinstimmen und die sich betr~chtlich yon denen unterscheiden, die mit herkgmmlichen Veffahren ermittelt werden, also bei denen ein ganzes Korn umorientiert wird, wenn ein bestimmtes Kriterium erf'ullt ist. Ffir die Fille des Walzens, der Zug-und der Druckverformung yon Zirkonlegierungen werden verschiedene Kombinationen von Gleit-und Zwillingsmoden und die zugeh6rigen kritischen Spannungen s...

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Section: Rolling Texturessupporting

confidence: 81%

A model for texture development dominated by deformation twinning: Application to zirconium alloys

Tomé¹,

Lebensohn²,

Kocks³

1991

Acta Metallurgica et Materialia

572

200

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“…Studies on texture developments during cold working of Zr-2.5% Nb are mainly limited to the determination of two-dimensional pole figures and not in terms of orientation distribution functions (ODFs) [20,28,[33][34][35][36][37][38]. Microtexture development in cold deformed single phase and two-phase Zr alloys, has largely remained as an uncharted territory.…”

Section: Introductionmentioning

confidence: 99%

Explaining absence of texture development in cold rolled two-phase Zr–2.5 wt% Nb alloy

et al. 2003

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In the present study, two distinct starting microstructures of Zr-2.5 wt% Nb have been used: (1) single-phase α hcp martensitic structure; and (2) two-phase, 10% bcc β and rest hcp α, Widmanstätten structure. In the second case, two types of α were present-near grain boundary predominantly single-phase α (about 5% of the total α) and α plates in an apparently continuous β matrix. Both (1) and (2) had similar starting crystallographic texture of the hcp α phase and were deformed by unidirectional and cross rolling. In the two-phase structure the changes in the bulk texture on cold rolling was found to be insignificant, while in the single-phase material noticeable textural changes were observed. Taylor type deformation texture models predicted textural changes in single-phase structure but failed to predict the observed lack of textural development in the two-phase material. Microtexture observations showed that α plates remained approximately single crystalline after cold rolling, while the β matrix underwent significant orientational changes. Relative hardening, estimated by X-ray peak broadening, was observed mainly in β phase; while aspect ratio of α plates remained unchanged with cold rolling-indicating absence of effective macroscopic strain in the hcp α plates. Based on microstructural and microtextural observations, a simple model is proposed in which the plastic flow is mainly confined to the β matrix within which the α plates are subjected to 'in-plane rigid body rotation'. The model explains the observed lack of textural developments in the two-phase structure.

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“…At the large strains obtained during mechanical processing, steady state interactions occur between the twin and slip systems that tend to align the basal planes parallel to the direction of the main deformation for rolling and pilgering (Tenckhoff, 1978) and perpendicular to that direction for extruding . The final texture may change with the specific conditions of the processing mechanisms utilized (Moulin et al, 1984 a;MacEwen et al, 1988).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Zirconium Alloys in Nuclear Applications

Lemaignan

Motta

2006

Materials Science and Technology

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The development of the deformation texture in zirconium during rolling in sequential passes

Cited by 70 publications

References 11 publications

A model for texture development dominated by deformation twinning: Application to zirconium alloys

A model for texture development dominated by deformation twinning: Application to zirconium alloys

Explaining absence of texture development in cold rolled two-phase Zr–2.5 wt% Nb alloy

Zirconium Alloys in Nuclear Applications

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