Effect of initial textures on deformation mechanisms and texture evolutions of Zrα polycrystals deformed by channel-die compression tests

Francillette, H.; Bacroix, Brigitte; Gaspérini, M.; Béchade, Jean-Luc

doi:10.1016/s0921-5093(97)00410-3

Cited by 26 publications

(14 citation statements)

References 5 publications

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“…Prior joint experimental and modeling studies have shown that basal slip in Zr is the hardest of the three common slip modes in HCP metals (prismatic, pyramidal, and basal) to activate. In low strain, ambient conditions, basal slip is not activated in single crystals [37], and typically occurs only at localized regions of the microstructure, such as near cracks [32,37], near twins and kink bands [95], and free surfaces [37,[96][97][98]. Anomalously high contributions of basal slip in Zr have been reported in ambient conditions in large strain and severe plastic deformation, e.g., >1.0 [46,99], which are much higher than the strain levels achieved here.…”

Section: Basal Slip At High Temperaturesmentioning

confidence: 99%

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

et al. 2015

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We investigate the temperature and rate dependence of slip, twinning, and secondary twinning in high-purity hexagonal close packed a-Zr over a wide range of temperatures and strain rates (from 76 K to 673 K and 0.001 s À1 to 4500 s À1 ). To reliably identify the dominant deformation mechanisms for each condition, we employ electron-backscattered diffraction (EBSD), dislocation theory, multi-scale polycrystal constitutive modeling, and a thermally activated dislocation density evolution based hardening law. We demonstrate with direct comparison with measurement that the constitutive model, with a single set of intrinsic material parameters, can predict the underlying texture evolution, primary and secondary slip and twin activity, and twin volume fraction associated with the different loading orientations and applied temperatures and strain rates. We find that the f1 0 1 2gh1 0 1 1i twin is the preferred tension twin, either as a primary or secondary twin depending on the sample orientation, over the broad temperature and strain rate range tested. In contrast, we show that the preferred contraction twin, whether f1 1 2 2gh1 1 2 3i or f1 0 1 1gh1 0 1 2i, is sensitive to temperature but insensitive to strain rate and whether it is a primary or secondary twin. Based on the concomitant changes in the dominant slip mode predicted by the model and revealed by the texture development, we rationalize that the temperature-induced transition in contraction twinning is due to the increased predominance of basal hai slip at high temperatures (>673 K). Last, our analysis implies that all twin modes studied are rate insensitive and so the strong influence of strain rate and temperature on twinning is due to the rate-sensitivity of slip.

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Section: Basal Slip At High Temperaturesmentioning

confidence: 99%

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

et al. 2015

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“…This has previously been observed in Ti, [13] as well as in other hexagonal metals such as Mg [5] and Zr. [14] The compression test results after deformation at 25°C, 200°C, and 400°C for selected grain sizes are shown in Figure 1(b). It can be seen that at the higher two temperatures (200°C and 400°C), the samples with the larger grain sizes actually exhibit higher flow stress values compared to the smaller grained samples, at a strain of 0.3.…”

Section: A Mechanical Behaviormentioning

confidence: 99%

Deformation Twinning and the Hall–Petch Relation in Commercial Purity Ti

Stanford

Carlson

Barnett

2008

Metall Mater Trans A

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The effect of grain size and deformation temperature on the behavior of wire-drawn a-Ti during compression has been examined. At strains of 0.3, the flow stress exhibited a negative HallPetch slope. This is proposed to result from the prevalence of twinning during the compressive deformation. Electron backscattered diffraction revealed that f10 " 12g was the most prolific twin type across all the deformation temperatures and grain sizes examined. Of the twinning modes observed, f11 " 22g twinning was the most sensitive to the grain size and deformation temperature. The range of morphologies exhibited by deformation twins is also described.

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“…elasto-plastic [16] and visco-plastic self-consistent [17] models) has been found to improve the ability to reproduce experimental macroscopic flow curves [18] and bulk texture development [19][20][21] caused by plastic deformation. However, other researchers [15,[22][23][24] have instead preferred to include pyramidal hai-slip as an alternative to basal slip in order to achieve optimal agreement with their experimental data.…”

Section: Introductionmentioning

confidence: 99%

Evidence for basal 〈a〉-slip in Zircaloy-2 at room temperature from polycrystalline modeling

Holt

Daymond

2008

Journal of Nuclear Materials

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Effect of initial textures on deformation mechanisms and texture evolutions of Zrα polycrystals deformed by channel-die compression tests

Cited by 26 publications

References 5 publications

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

Strain rate and temperature effects on the selection of primary and secondary slip and twinning systems in HCP Zr

Deformation Twinning and the Hall–Petch Relation in Commercial Purity Ti

Evidence for basal 〈a〉-slip in Zircaloy-2 at room temperature from polycrystalline modeling

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