Quantitative characterization of crystallographic textures in zirconium alloys

Knorr, D. B.; Pelloux, R. M.

doi:10.1016/0022-3115(77)90181-7

Cited by 26 publications

(6 citation statements)

References 13 publications

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“…Because cubic materials are relatively isotropic in their properties, there has been little work on the effect of deformation on the textures of polycrystalline cubic materials. There have been, however, numerous studies on texture evolution due to twinning in HCP metals [8,[44][45][46][47][48][49][50][51][52], and more recently for austenitic alloys [53][54][55][56]. There have been a number of modelling studies that attribute texture evolution to dislocation slip, where researchers incorporate a rotation by imposing a requirement that the plastic strain tensors must be symmetric [2,[5][6][7][8][9][10].…”

Section: Crystallographic Texture and Deformation Twinningmentioning

confidence: 99%

“…The notion that grains might rotate by a slip-based mechanism is difficult to comprehend unless it involves GNDs. Most textural changes during fabrication of Zr-alloys can be attributed to twinning [44][45][46][47][48][49][50][51][52]. An example of texture changes caused by the operation of different twinning systems in the simple case of rolling is shown in Figure 18.…”

Section: Crystallographic Texture and Deformation Twinningmentioning

confidence: 99%

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Crystal Orientation and Dislocation Slip

Griffiths

2023

Metals

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It is a widely held belief that dislocation slip has a direct effect on crystal orientation. Some of the confusion may be attributed to semantics when researchers are referring to related effects of dislocations on crystal orientation; either elastic bending due to constraints or the creation of geometrically necessary dislocations by climb. This communication highlights the distinction between the two and discusses why what is often imagined conflicts with what is real and possible. It is demonstrated that deformation-induced changes in the orientation of crystals are primarily limited to twinning and collections of geometrically necessary dislocations (GNDs), which in the most extreme cases are sub-grain boundaries. Alternate explanations for texture changes related to dislocation slip are provided, and they challenge the notion that grains can simply rotate because of dislocation slip through some undefined mechanism.

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Section: Crystallographic Texture and Deformation Twinningmentioning

confidence: 99%

Section: Crystallographic Texture and Deformation Twinningmentioning

confidence: 99%

Crystal Orientation and Dislocation Slip

Griffiths

2023

Metals

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“…Crystallographic texture is determined by the x-ray diffraction techniques of inverse pole figure and direct pole figure [6). Texture measurements are made at four locations in the tube wall: ID surface, 0.10 mm (4 mils) from the ID Surface, 0.47 mm (18.5 mils) from the ID surface, and 0.10 rnm from the OD surface.…”

Section: A Materials Characterizationmentioning

confidence: 99%

“…ID surface of Supplier A, Figure 1; 0.10 mm from ID surface of Supplier A, Crystallographic texture is quantified by the calculation of texture numbers [6]. The Kearns texture parameter f 1 [7,8] represents the resolved fraction of basal poles in a reference direction, i.…”

Section: A Materials Characterizationmentioning

confidence: 99%

Research on mechanisms of stress corrosion cracking in Zircaloy

Knorr¹,

Pelloux²

1981

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The results of internal gas pressurization tests, primarily at 320°C, on cladding tubes from two suppliers, Supplier A and Supplier B, are presented. The two lots show a substantial difference in iodine SCC susceptibility so a test matrix is used to resolve the relative contributions of surface condition, residual stress, and texture, Additional tests with constant deflection split-rLng specimens and with unstressed cladding segments are used to understand crack initiation and the early crack growth stages of SCC. The difference in sec susceptibility is due to crystallographic texture. Other variables such as surface finish, stress relief temperature, and residual stress have little or no effect. Mechanical properties, crack initiation, and crack propagation all depend on texture, Both initiation and propagation features are analyzed by scanning electron microscopy. A mechanism for crack initiation consistent with most observations in this study and with the work of other investigators is proposed. At 320°C, lifetime is crack initiation limited while several tests at 390°C indicate that lifetime is less initiation limited at higher temperature.

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“…1,4 Developments of crystallographic texture during processing are important both for understanding and optimising the thermomechanical processing itself and also for obtaining optimised structure property co-relation for subsequent usage. 3,[6][7][8][9][10][11] Our understanding of the structural developments during hot/warm deformation of cubic systems remains far from complete. Naturally, such understanding in hexagonal alloys (as in zirconium based alloys) is even less evolved than their cubic counterparts.…”

Section: Introductionmentioning

confidence: 99%

Multipass warm/hot rolling of single phase Zircaloy 2: Developments in crystallographic texture and in lattice strain

Vanitha¹,

Kumar²,

Dey³

et al. 2009

Materials Science and Technology

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Zircaloy 2, a cast and hot forged alloy with a Widmanstätten structure, was warm/hot rolled to 40 and 80% reductions at approximate working temperatures of 200, 400, 600 and 800°C. The bulk crystallographic texture had clearly different patterns of developments between 200/400 and 600/800°C deformed structures. The estimated lattice strain, on the other hand, had shown noticeable relative softening and hardening after the respective deformation temperatures of 600 and 800°C. The patterns of macroscopic developments, both in bulk crystallographic texture and in lattice strain, could be explained from the microstructural observations. The difference in bulk crystallographic texture was primarily related to the preferred appearance of recrystallised grains. The 600°C rolled structure was associated with recovery/recrystallisation and a concurrent softening while the effects of a similar softening was suppressed through significant intermetallic precipitations and associated strain localisations in the 800°C rolled material.

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Quantitative characterization of crystallographic textures in zirconium alloys

Cited by 26 publications

References 13 publications

Crystal Orientation and Dislocation Slip

Crystal Orientation and Dislocation Slip

Research on mechanisms of stress corrosion cracking in Zircaloy

Multipass warm/hot rolling of single phase Zircaloy 2: Developments in crystallographic texture and in lattice strain

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