Plastic flow anisotropy of pure zirconium after severe plastic deformation at room temperature

Yapıcı, Güney Güven; Tomé, Carlos N.; Beyerlein, Irene J.; Караман, И.; Vogel, Sven C.; Liu, C.

doi:10.1016/j.actamat.2009.06.050

Cited by 77 publications

(46 citation statements)

References 49 publications

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“…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. Recent ab initio calculations reveal that basal slip in Zr involves the thermally activated motion of a prismatic stacking fault normal to the prismatic plane [100], implying that high temperatures would promote basal slip.…”

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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“…On the other hand, SPD techniques have only achieved 0.5 lm grain size in Mg alloys [22,[36][37][38]. Prior attempts to refine the grain structure in Zr via SPD either led to submicron grains with grain diameters >100 nm [23,24,39,40] or a fraction of nanograins of Zr with an alternate crystal structure (omegaZr, beta-Zr or fcc Zr) [23][24][25]41]. With single-phase commercial purity Zr, the final grain size reached with the ARB technique was 400 nm [42].…”

Section: Introductionmentioning

confidence: 96%

Bulk texture evolution of nanolamellar Zr–Nb composites processed via accumulative roll bonding

et al. 2015

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It was recently demonstrated that bulk two-phase 50/50 Zr-Nb nanolayered composites with 90 nm individual layers can be fabricated from an initial coarse-layered composite with 1 mm layers via the severe plastic deformation process of accumulative roll bonding. During the deformation, the Zr phase retained its hcp crystal structure and the Zr-Nb interface remained sharp. Here we use a combination of neutron diffraction and dislocation-based polycrystal plasticity constitutive modeling to assess the evolution of texture and deformation mechanisms over a four order-ofmagnitude range in layer thickness. The phase textures in the nanocomposite strongly deviate from that of Zr or Nb rolled in monolithic form, becoming highly peaked and intense. The model suggests that texture development in the Nb phase is associated with multiple slip and contributions from both {1 1 2}h1 1 0i slip and {1 1 0}h1 1 0i slip. In the Zr phase the model suggests that the texture develops due to a predominance of prismatic hai and basal hai slip.

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“…[54,55] Compared with other texture measurement techniques, NeD enables statistically relevant data without potential modifications due to surface preparation. Texture measurements also provide a robust indicator of the primary deformation mechanisms, such as when interface-driven plasticity, [28,56] grain boundarymediated processes, [57] deformation twinning, [58][59][60] and partial-mediated slip [61] prevail. Figure 3 shows examples of textures at the micron scale and nanoscale in the form of pole figures, a compact way to present texture, as well as the standard texture presentation for Zr (albeit not for Nb).…”

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The Suppression of Instabilities via Biphase Interfaces During Bulk Fabrication of Nanograined Zr

Carpenter

Nizolek

McCabe

et al. 2014

Materials Research Letters

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Plastic flow anisotropy of pure zirconium after severe plastic deformation at room temperature

Cited by 77 publications

References 49 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

Bulk texture evolution of nanolamellar Zr–Nb composites processed via accumulative roll bonding

The Suppression of Instabilities via Biphase Interfaces During Bulk Fabrication of Nanograined Zr

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