A multi-scale model for texture development in Zr/Nb nanolayered composites processed by accumulative roll bonding

Ardeljan, Milan; Knežević, Marko; Nizolek, Thomas J.; Beyerlein, Irene J.; Zheng, Shijian; Carpenter, John S.; McCabe, Rodney J.; Mara, Nathan A.; Pollock, Tresa M.

doi:10.1088/1757-899x/63/1/012170

Cited by 14 publications

(10 citation statements)

References 86 publications

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“…(1) Using neutron diffraction we show that the as rolled textures of the Zr and Nb phases within the composite deviated from those observed in Zr [58] and Nb [55] when rolled separately, in Nb in accumulative roll bonded Cu-Nb [14], and in the Zr and Nb phases within accumulative roll bonded Zr-Nb without an intermittent annealing treatment [64]. …”

Section: Discussionmentioning

confidence: 94%

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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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Section: Discussionmentioning

confidence: 94%

“…Although shear banding is suppressed, interface roughening is observed. Interface roughening is not limited to the Zr-Nb material system and has been observed in the Cu-Nb, Cu-Zn, and Cu/Zn/Al systems [14,16,62] and is predicted in two-phase crystal plasticity finite element calculations [47,63,64].…”

Section: Number Of Layersmentioning

confidence: 86%

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

et al. 2015

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“…The evolution equations for density q are based on thermally activated rate laws. 69 The specific forms for these equations adopted here were developed originally for low symmetry metals, such as Zr, [70][71][72][73][74] Mg, [75][76][77] Be, 78,79 and U. [80][81][82] Since this is the first time this hardening model has been applied to FCC Cu, we briefly review this formulation below.…”

Section: Constitutive Lawmentioning

confidence: 99%

Enhancement of orientation gradients during simple shear deformation by application of simple compression

Jahedi

Ardeljan

Beyerlein

et al. 2015

Journal of Applied Physics

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A study of subgrain formation in Al 3003 H-18 foils undergoing ultrasonic additive manufacturing using a dislocation density based crystal plasticity finite element framework Effect of temperature, strain, and strain rate on the flow stress of aluminum under shock-wave compression J. Appl. Phys. 112, 073504 (2012); 10.1063/1.4755792Amorphization and ultrafine-scale recrystallization in shear bands formed in shock-consolidated Pr 2 Fe 14 B ∕ α -Fe nanocomposite magnetsWe use a multi-scale, polycrystal plasticity micromechanics model to study the development of orientation gradients within crystals deforming by slip. At the largest scale, the model is a full-field crystal plasticity finite element model with explicit 3D grain structures created by DREAM.3D, and at the finest scale, at each integration point, slip is governed by a dislocation density based hardening law. For deformed polycrystals, the model predicts intra-granular misorientation distributions that follow well the scaling law seen experimentally by Hughes et al., Acta Mater. 45 (1), 105-112 (1997), independent of strain level and deformation mode. We reveal that the application of a simple compression step prior to simple shearing significantly enhances the development of intra-granular misorientations compared to simple shearing alone for the same amount of total strain. We rationalize that the changes in crystallographic orientation and shape evolution when going from simple compression to simple shearing increase the local heterogeneity in slip, leading to the boost in intra-granular misorientation development. In addition, the analysis finds that simple compression introduces additional crystal orientations that are prone to developing intra-granular misorientations, which also help to increase intra-granular misorientations. Many metal working techniques for refining grain sizes involve a preliminary or concurrent application of compression with severe simple shearing. Our finding reveals that a pre-compression deformation step can, in fact, serve as another processing variable for improving the rate of grain refinement during the simple shearing of polycrystalline metals. V C 2015 AIP Publishing LLC.

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“…Hardening of slip systems is based on the rate of dislocation storage, which is a thermally activated mechanism and, hence, it is dependent on temperature and also on strain rate. In several prior studies, a similar hardening model has been successfully applied to a range of metals involving different crystal structure: hexagonal close packed (HCP) Zr (Beyerlein and Tomé, 2008;Knezevic et al, 2013b;Knezevic and Landry, 2015;Knezevic et al, 2014e;, Be (Brown et al, 2012;Knezevic et al, 2013a;Zecevic et al, 2015a), Mg (Beyerlein et al, 2011;Lentz et al, 2015a;Lentz et al, 2015b), body centered cubic (BCC) Ta (Ardeljan et al, 2014a;Ardeljan et al, 2015a;Ardeljan et al, 2014b;Bhattacharyya et al, 2015;Knezevic et al, 2014e), face centered cubic (FCC) alloys (Knezevic et al, 2014b;Zecevic and Knezevic, 2015), and orthorhombic uranium (Ardeljan et al, 2015b;Knezevic et al, 2012;Knezevic et al, 2013d;Knezevic et al, 2013e). In this model, the slip resistance is defined as:…”

Section: Hardening Lawmentioning

confidence: 99%

Dual-phase steel sheets under cyclic tension–compression to large strains: Experiments and crystal plasticity modeling

Zecevic

Korkolis

Kuwabara

et al. 2016

Journal of the Mechanics and Physics of Solids

128

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In this work, we develop a physically-based crystal plasticity model for the prediction of cyclic tension-compression deformation of multi-phase materials, specifically dual-phase (DP) steels. The model is elasto-plastic in nature and integrates a hardening law based on statistically stored dislocation density, localized hardening due to geometrically necessary dislocations (GNDs), slip-system-level kinematic backstresses, and annihilation of dislocations. The model further features a two level homogenization scheme where the first level is the overall response of a two-phase polycrystalline aggregate and the second level is the homogenized response of the martensite polycrystalline regions. The model is applied to simulate a cyclic tensioncompression-tension deformation behavior of DP 590 steel sheets. From experiments, we observe that the material exhibits a typical decreasing hardening rate during forward loading, followed by a linear and then a non-linear unloading upon the load reversal, the Bauschinger effect, and changes in hardening rate during strain reversals. To predict these effects, we identify the model parameters using a portion of the measured data and validate and verify them using the remaining data. The developed model is capable of predicting all the particular features of the cyclic deformation of DP 590 steel, with great accuracy. From the predictions, we infer and discuss the effects of GNDs, the backstresses, dislocation annihilation, and the two-level homogenization scheme on capturing the cyclic deformation behavior of the material.

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A multi-scale model for texture development in Zr/Nb nanolayered composites processed by accumulative roll bonding

Cited by 14 publications

References 86 publications

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

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

Enhancement of orientation gradients during simple shear deformation by application of simple compression

Dual-phase steel sheets under cyclic tension–compression to large strains: Experiments and crystal plasticity modeling

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