High strength and ductility in multimodal-structured Zr

Guo, Defeng; Li, Ming; Shi, Yindong; Zhang, Zhibo; Zhang, Haitian; Liu, Xiaoman; Wei, Bingning; Zhang, Xiangyi

doi:10.1016/j.matdes.2011.08.002

Cited by 79 publications

(18 citation statements)

References 24 publications

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“…[39,40] Cryo-rolling followed by annealing treatments has been utilized to fabricate bimodal distributions of ultra-fine-grained and nanocrystalline Zr in the past. [41,42] However, this nanocrystalline Zr was captured during the annealing treatment as opposed to during the refinement process and showed little thermal stability as evidenced by the sharp decrease (70%) in the volume fraction of nanograins with an increase of 50…”

mentioning

confidence: 99%

“…[41] To fabricate nanolayered Zr/Nb, we started with h 0 = 2 mm sheets of high-purity Zr [43] and reactorgrade, high-purity Nb (99.97% pure, ATI-Wah Chang) (see supplement for composition and initial microstructure). Both starting sheets showed measureable preferred texture and equiaxed grains with average sizes of 40 μm for Zr and 300 μm for Nb (see Figure S1 in supplement).…”

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confidence: 99%

“…In addition, the thermal stability of the nanostructure is greatly enhanced by the presence of the Zr-Nb bimetal interfaces in comparison with the single-phase Zr nanograins in cryorolling studies. [41,42] To detect possible changes in the primary deformation mechanisms and crystal structures of the phases, we measured the bulk textures for each phase at all length scales using neutron diffraction (NeD, see supplement). NeD was carried out at the High Pressure Preferred Orientation neutron time-of-flight diffractometer at the Los Alamos Neutron Science Center at Los Alamos National Laboratory.…”

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confidence: 99%

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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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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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“…Annealing of deformed alloy at 400°C for 30 min proves to be helpful in removing internal strains and rearrangement of dislocations (Ref [33][34][35]. Due to plastic deformation, internal lattice strains are developed locally.…”

Section: Tem Resultsmentioning

confidence: 99%

Development of Ultrafine Grained Zircaloy-2 by Room Temperature Cross Rolling

Goel

Keskar

Jayaganthan

et al. 2014

J. of Materi Eng and Perform

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Effect of change in strain path by cross rolling up to a true strain of 1.89 has been studied in the present work. The Zircaloy-2 was subjected to solutionising heat treatment at 800°C in argon environment for 2 h and subsequently quenched in mercury prior to cross rolling at room temperature. The fragmentation of near basal grains due to change in strain path is evident from the EBSD micrographs. The dislocation density in the crossrolled alloy increases with true strain as calculated from the XRD and EBSD data and it is found to be 2.806453 3 10 16 /m 2 . 10 " 12 f gextension twins are observed initially up to 25% reduction, with the further reduction in thickness, near basal grains are oriented toward the normal direction. These basal grains undergone fragmentation due to changes in strain path upon cross-rolling as observed from KAM and EBSD images. TEM results of the cross-rolled sample confirm the formation of ultrafine and nanograins in the alloy due to orientation of incidental dislocation boundaries in the direction of macroscopic plastic flow and post-annealing treatment of the deformed alloy. A tensile strength of 991 MPa with 7.5% ductility is observed in the 85% cross-rolled alloy. The cross-rolled alloy upon annealing at 400°C for 30 min improves ductility to 11%.

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“…Such multi-modal grain distribution results in a unique combination of high strength and large ductility, e.g. a high ultimate tensile strength of $658 MPa and large uniform elongation of $ 8.5% [7]. Micro-scale pillars have also been fabricated using focused ion beam machining [8,9], which are then tested under compression to study role of grain size and pillar diameter.…”

Section: Introductionmentioning

confidence: 99%

In-situ TEM mechanical testing of nanocrystalline zirconium thin films

2015

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a b s t r a c tMechanical behavior of nanocrystalline zirconium thin films was investigated in-situ inside a transmission electron microscope (TEM). The yield stress measured for specimens with o 10 nm grain size was around 450-500 MPa compared to the bulk value of 250-300 MPa. Similar grain size effects are seen on fracture stress and strain of about 0.9 GPa and 1.5-2% respectively. Using in-situ TEM, we demonstrate control of grain size in the specimens using electro-migration stress and temperature. The experimental results suggest that the critical grain size for inverse Hall-Petch type relationship in nanocrystalline hexagonal close packed metals could be around 15 nm.

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High strength and ductility in multimodal-structured Zr

Cited by 79 publications

References 24 publications

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

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

Development of Ultrafine Grained Zircaloy-2 by Room Temperature Cross Rolling

In-situ TEM mechanical testing of nanocrystalline zirconium thin films

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