Irradiation-Induced Nanoprecipitation in Ni-W Alloys

Lee, Jaeyel; Lear, C.R.; Zhang, Xuan; Bellon, Pascal; Averback, Robert S

doi:10.1007/s11661-014-2704-4

Cited by 14 publications

(8 citation statements)

References 35 publications

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“…However, their films appeared to be not textured enough to concentrate the diffuse intensity of possibly present planar faults in reciprocal space; instead, only intensity rings from regular reflections appear, due to the polycrystalline nature of the film. Only Lee et al (2015) presented TEM investigations of cross-sectional and top-view samples of their magnetronsputtered, strongly textured Ni-W films, which demonstrate the presence of a high density of planar faults perpendicular to the growth direction and the same characteristics in the electron diffraction patterns as analyzed in the present work (see Fig. 3 of Lee et al, 2015).…”

Section: Interpretation Of Top-view Electron Diffraction Patternssupporting

confidence: 64%

“…Only Lee et al (2015) presented TEM investigations of cross-sectional and top-view samples of their magnetronsputtered, strongly textured Ni-W films, which demonstrate the presence of a high density of planar faults perpendicular to the growth direction and the same characteristics in the electron diffraction patterns as analyzed in the present work (see Fig. 3 of Lee et al, 2015). These characteristics were left undiscussed by Lee et al (2015).…”

Section: Interpretation Of Top-view Electron Diffraction Patternssupporting

confidence: 62%

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Interpretation of electron diffraction patterns in the presence of oriented planar faults

2015

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The presence of high planar‐fault densities in thin films, e.g. nanotwinned films, leads to peculiar diffraction effects. Frequently, the planar faults are oriented perpendicular to the growth direction. For the case of (nanosized) thin films of face‐centered cubic (fcc) metals, often a {111}fcc fiber texture prevails with the fiber axis parallel to the film normal. In diffraction patterns of cross‐sectional transmission electron microscopy (TEM) samples of such films, as a consequence of twinning with (111) planes parallel to the surface as twinning planes, intensity streaks appear parallel to the growth direction. These intensity streaks are, however, invisible in diffraction patterns of top‐view TEM samples. The latter diffraction patterns might be interpreted, at first sight, in terms of the diffraction pattern of a somehow textured fcc polycrystal. However, the diffraction‐ring radii deviate from the expected radii. The consideration of intensity cylinders in reciprocal space formed by diffuse intensity streaks generated by the planar faults leads to a perfect match of the accordingly predicted radii with the observed intensity‐ring radii.

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Section: Interpretation Of Top-view Electron Diffraction Patternssupporting

confidence: 64%

Section: Interpretation Of Top-view Electron Diffraction Patternssupporting

confidence: 62%

Interpretation of electron diffraction patterns in the presence of oriented planar faults

2015

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“…However, at temperatures <800 K, due to sluggish kinetics, long ageing times may be required to reach equilibrium [56]. Conversely, when subjected to neutron irradiation the kinetics may be accelerated [57,58]. It is therefore necessary to investigate the intermediate temperature behaviour experimentally and assess the accuracy of the theoretical predictions.…”

Section: Alloy Search and Predict (Asap)mentioning

confidence: 99%

High temperature, low neutron cross-section high-entropy alloys in the Nb-Ti-V-Zr system

et al. 2019

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High-entropy alloys (HEAs) with high melting points and low thermal neutron cross-section are promising new cladding materials for generation III+ and IV power reactors. In this study a recently developed high throughput computational screening tool Alloy Search and Predict (ASAP) has been used to identify the most likely candidate single-phase HEAs with low thermal neutron cross-section, from over a million four-element equimolar combinations. The selected NbTiVZr HEA was further studied by density functional theory (DFT) for moduli and lattice parameter, and by CALPHAD to predict phase formation with temperature. HEAs of NbTiVZrx (x = 0.5, 1, 2) were produced experimentally, with Zr varied as the dominant cross-section modifier. Contrary to previous experimental work, these HEAs were demonstrated to constitute a single-phase HEA system; a result obtained using a faster cooling rate following annealing at 1200°C. However, the beta (BCC) matrix decomposed following aging at 700°C, into a combination of nano-scale beta, alpha (HCP) and C15 Laves phases.

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“…They could not find NiW in either arc melted or sintered samples. Lee et al [49] have studied Ni-W thin films, annealed them at 1 573 K and they also found Ni 6 W 6 C compound. Marvel et al [50] have also found Ni 6 W 6 C from electroplated and sputtered thin films with composition Ni-23 at.% W annealed at 973 K. This phase thus forms probably due to carbon contamination, which is difficult to avoid in practice.…”

Section: Phase Diagram and Activity Datamentioning

confidence: 99%

“…They could not find NiW 2 in arc melted samples. Lee et al [49] found Ni 2 W 4 C compound from room temperature Kr-irradiated film, which was after that annealed at 1 123 K. As a conclusion, it was found that NiW is in fact the carbide Ni 6 W 6 C( M 12 C) [40, 48 -50] and NiW 2 is the carbide Ni 2 W 4 C( M 6 C) [40,48,49], so these intermetallic compounds NiW and NiW 2 do not likely exist. Table 1 …”

Section: Phase Diagram and Activity Datamentioning

confidence: 99%

First principles, thermal stability and thermodynamic assessment of the binary Ni–W system

Isomäki

Hämäläinen

Braga

et al. 2017

International Journal of Materials Research

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First principles, thermal stability and thermodynamic assessment of the binary Ni-W systemThe Ni-W binary system was assessed using critically evaluated experimental data with assistance from first principles analysis and the CALPHAD method. The solution phases (liquid, fcc-A1 and bcc-A2) were modeled using the substitutional regular solution model. The recently discovered Ni 8 W metastable phase was evaluated as Fe 16 C 2 -like martensite with three sublattices, and shown to be possibly stable according to first principles calculations. Ni 8 W was also modeled as an interstitial compound, but the model is not good because the solubility of tungsten in nickel is very low, especially at low temperatures. There is no experimental evidence for such low solubility. The other binary compounds Ni 4 W and Ni 3 W were assessed as stoichiometric ones. Compared independent experimental and first principles data agree well with the calculated phase diagram using updated thermodynamic parameters.

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Irradiation-Induced Nanoprecipitation in Ni-W Alloys

Cited by 14 publications

References 35 publications

Interpretation of electron diffraction patterns in the presence of oriented planar faults

Interpretation of electron diffraction patterns in the presence of oriented planar faults

High temperature, low neutron cross-section high-entropy alloys in the Nb-Ti-V-Zr system

First principles, thermal stability and thermodynamic assessment of the binary Ni–W system

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