On Structural Aspects of Texture Changes During Rolling of Zr-2.5%Nb Alloy

Grytsyna, Victor; Malykhin, D. G.; Yurkova, Tetiana; Kovtun, K. V.; Chernyayeva, T. P.; Ковтун, Г. П.; Tantsura, Iryna G.; Voyevodin, V.N.

doi:10.26565/2312-4334-2019-3-05

Cited by 5 publications

(15 citation statements)

References 4 publications

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“…During extension, on the contrary, the metal layers on the convex side of the sheet undergo compression deformation, while the metal layers on the concave side of the sheet experience tensile deformation. Similar discrepancies were found earlier in the work [27] at the investigation of the crystallographic texture of Zr-2.5% Nb alloy strip. The strip was obtained by straightening part of the pipe after cut along axis.…”

Section: Alternating Bendingsupporting

confidence: 90%

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Effect of Kind of Deformation on Young's Modulus, Damage Parameter, Texture and Structure of Alloy Mg – 5% Li (wt)

Usov

Brokmeier²,

Shkatulyak

et al. 2020

EEJP

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Effect of deformation by extrusion, rolling after extrusion (in combination with annealing and changing the rolling direction), and subsequent alternating bending (AB) with the number of cycles 0.5, 1, 3, and 5 on the elastic modulus (E), damage accumulation parameter (damage parameter ω), crystallographic texture, and substructure parameters of the binary Mg-5%Li alloy have been studied. The damage parameter (0 ≤ ω ≤ 1), which is interpreted as the relative reduction in the effective load-bearing cross-sectional area due to damage accumulation, was found by the change in the elastic modulus after various above types of deformation. At this, we used to compare equivalent deformation and equivalent elastic energy models. The substructure parameters (crystalline domains sizes D, lattice distortion ε, dislocation density ρ) were estimated by analyzing the physical broadening of the lines diffraction on the crystal lattice of studied alloy of the penetrating hard X-ray synchrotron radiation. It was found that in the studied alloy, sheet forms a texture, at which the hexagonal prism axis is 90° deviated from the normal direction (ND) to the sheet up to transverse direction (TD) after extrusion of the ingot at 350°C in combination with its further rolling in the direction of extrusion axis (rolling direction RD) to a thickness of 4.5 mm and annealing at 350°C after each pass. At this the crystallographic directions and coincide with RD. The texture, at which the hexagonal prism axis is deviated from ND to TD by angles ranging from 15 to 70° (unlike from texture of basal type of the pure magnesium) is formed after further rolling of studied alloy to a thickness of 1 mm with the changing of the RD on 90° in combination with annealing at 350°C after each pass. The crystallographic direction coincides with RD. The anisotropy of above mentioned characteristics was found. Correlation and regression analysis showed that the anisotropy and the values of E, D, ε, and ρ, are decreased, and the values of ω are increased with an increase of alternating bend cycles’ number. It is shown that changes in the above characteristics are mainly due to the crystallographic texture formed during thermomechanical processing and subsequent alternating bending of Mg-5%Li alloy sheets, which is confirmed by data of correlation and regression analysis.

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Section: Alternating Bendingsupporting

confidence: 90%

“…c-axes of the crystalline HCP cell of grains with a given geometric direction in the polycrystalline material and can be found from the inverse pole figure by the ratio [27]:…”

Section: Eejp 1 (2020)mentioning

confidence: 99%

Effect of Kind of Deformation on Young's Modulus, Damage Parameter, Texture and Structure of Alloy Mg – 5% Li (wt)

Usov

Brokmeier²,

Shkatulyak

et al. 2020

EEJP

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“…The deformation processes are alternated when the sign of bending is periodical changed. Similar inconsistencies in the distribution of the pole density on the IPFs of the outer and inner sides of the strips obtained after cutting along the axis and subsequent straightening of the tube made of Zr-2.5% Nb alloy were found earlier in [16].…”

Section: Eejp 1 (2021)supporting

confidence: 77%

“…We could not experimentally measure the elastic modulus in the normal direction ND E to the rolling plane due to the small sheet thickness (1 mm). The value of the ND E in the original sheet of the ZE10 alloy estimated earlier us in [16] was 43.8 GPa. The value of the ND E obtained in this work (Table 6) deviates from the above value by 0.9% (Table 6).…”

Section: Eejp 1 (2021)mentioning

confidence: 57%

Elastic Properties of Alloy ZE10 Sheets Evaluation by Kerns Texture Parameters

Usov

Shkatulyak

Savchuk

et al. 2021

EEJP

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The ZE10 magnesium alloy with the rare-earth metal additives, which contribute to a better forming of the alloy, was used as studied material. The ZE10 magnesium alloy with the rare-earth metal additives, which contribute to a better forming of the alloy, was used as studied material. Sheet material is usually straightened on roller levelers to relieve residual stresses and improve flatness. The metal is subjected to alternating deformation by bending when straightening. The changes in the structure, crystallographic texture and, as a result, physical and mechanical properties occur in the metal are often not taken into account in the future. The elastic modulus is an important parameter, for example, in the production of products using bending. In this work, the elastic modulus of sheets of magnesium alloy ZE10 was estimated in three main directions. A starting sheet was obtained by extruding an ingot, then rolling in the longitudinal direction and then rolling with a change in direction by 90° after each pass in combination with heating to 350°C. The original sheets were subsequently subjected to alternate folding. Evaluations were made of the elastic modulus of the original sheet, as well as the sheets after 0.5, 1.0, 3.0 and 5.0 alternating bending cycles. To estimate the elastic modulus, we used the Kearns texture parameters , which we calculated from the inverse pole figures, as well as the elastic constants of the single crystal of the ZE10 alloy found by us. The maximum deviation of the calculated and experimental values of the elastic modulus did not exceed 5.2%. Strong correlations and quadratic regression equations have been established between the values of the elastic modulus, mechanical characteristics (tensile strength, yield stress, elongation), on the one hand, and the above-mentioned parameters of the Kerns texture, on the other hand. The approximation reliability coefficients are 0.76 - 0.99.

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“…This work is a supplement to the cycle of X-ray studies of regularities of changes in the crystallographic texture during cold deformation of zirconium and its alloys [1][2][3]. A feature of such works is the implementation of X-ray studies of rolling textures from their moderate level and the use of the method of inverse pole figures (IPFs) with an increased accuracy of determining the quantitative texture characteristics.…”

mentioning

confidence: 99%

Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

Malykhin

Kovtun

Yurkova

et al. 2021

EEJP

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This work is a continuation of a series of works on the study of regularities and structural mechanisms of changes in characteristics of crystallographic texture during cold deformation of plates made of Zr2.5%Nb alloy. Effects of influence of surface cleanliness of the plates on the textural regularities during their rolling were investigated. For this, longitudinal fragments of the tube Æ15.0´1.5 mm² were used, flattened, annealed at 580°C in a vacuum of 1.5...3.0 Pa and rolled along the axis of the original tube with various degrees deformation up to 56%, which is likened to longitudinal rolling of plates. Techniques of maximally uniform straightening of tube fragments were used. An analysis of the results of studies of textural changes during cross rolling of plates, straightened from rings of the same tube and pretreated under similar conditions, is also carried out. To analyze the results, the method of inverse pole figures was used, which, in these studies, is distinguished by the possibility of achieving satisfactory accuracy in calculating the integral characteristics of texture. On this basis, the Kearns textural coefficient was calculated along the normal to the plates’ plane. Corrections were introduced for texture dissimilarity along the thickness of the plates, which is caused by the unbending of the preliminary blanks. Additionally, the analysis of texture distributions was carried out using original techniques. According to the results obtained – as a result of X-ray measuring from the plates’ surface – oscillations of the course of changes in the texture coefficient were revealed. This is associated with an alternating process of relaxation of residual stresses during deformation. It has been established that this effect is initiated from the near-surface regions, is associated with a near-surface impurity, and in some cases can penetrate to a considerable depth of the plates. The twinning nature of such regularities is confirmed and active systems of twins are noted.

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On Structural Aspects of Texture Changes During Rolling of Zr-2.5%Nb Alloy

Cited by 5 publications

References 4 publications

Effect of Kind of Deformation on Young's Modulus, Damage Parameter, Texture and Structure of Alloy Mg – 5% Li (wt)

Effect of Kind of Deformation on Young's Modulus, Damage Parameter, Texture and Structure of Alloy Mg – 5% Li (wt)

Elastic Properties of Alloy ZE10 Sheets Evaluation by Kerns Texture Parameters

Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

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