Relaxation path of metastable nanoclusters in oxide dispersion strengthened materials

Ribis, J.; Thual, Marc-Antoine; Guilbert, Thomas; Carlan, Y. de; Legris, Alexandre

doi:10.1016/j.jnucmat.2016.12.007

Cited by 14 publications

(20 citation statements)

References 41 publications

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“…The Y, Ti, and O precipitate as NOs during consolidation [13 , 21] . NOs have been characterized using transmission electron microscopy (TEM) [20][21][22][23][24][25][26] , atom probe tomography (APT) [27][28][29][30] , small angle neutron scattering (SANS) [21 , 31] , and x-ray diffraction (XRD) [32][33][34][35] . Typical NFA NO characteristics include average diameters d ≈ 1 to 3 nm, number densities N ≈ 10 23 -24 /m 3 and volume fractions f ≈ 0.5 to 1% [13 , 21] .…”

Section: Introductionmentioning

confidence: 99%

Characterization of polyhedral nano-oxides and helium bubbles in an annealed nanostructured ferritic alloy

Stan

Ciston

et al. 2020

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Characterization of polyhedral nano-oxides and helium bubbles in an annealed nanostructured ferritic alloy

Stan

Ciston

et al. 2020

Acta Materialia

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“…The electronic contrast between the precipitates and the matrix has been calculated using 2 hypotheses on the nature of the nano-oxides: Y2Ti2O7 pyrochlore and Y2TiO5 orthorhombic (Tab. 1), the two most common precipitates observed in ODS [16,[19][20][21][22][23][24][25][26][27]. These two apparent fv are plotted in Fig.…”

mentioning

confidence: 96%

“…After MA, Hot Extrusion (HE) or Hot Isostatic Pressing (HIP) at temperature around 1100°C generates a dense material and induces the precipitation of Y-Ti-O oxides. The nano-oxides found after consolidation have been mainly reported as Y2Ti2O7 pyrochlore or defective NaCl structure by Transmission Electron Microscopy (TEM) [19][20][21][22], Atom Probe Tomography (APT) [23,24], and Small Angle X-ray/Neutron Scattering (SAXS/SANS) [16,25]. The Y2TiO5 orthorhombic structure has also been reported [16,26,27].…”

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confidence: 99%

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

et al. 2020

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Oxide Dispersion Strengthened (ODS) steels are candidates for nuclear applications. ODS are produced by mechanical alloying of Fe-14Cr, Y2O3 and TiH2 powders and consolidation at 1100°C, resulting in finely dispersed nano-oxides. Their precipitation kinetics has been quantitatively determined by in-situ Small Angle X-ray Scattering during continuous heating up to 1100°C. Clusters, found in the as-milled state start growing at 450°C until 1100°C, while almost no coarsening was recorded during subsequent isothermal annealing. The nano-oxides resulting from these in-situ experiments were found to be representative of those in materials processed by hot isostatic pressing and hot extrusion.

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“…The lattice structures of very small nano-oxides (<1.5 nm), called nano-clusters [26], are difficult to image by HRTEM owing to their very small size. However, Figure 6a proposes a HRTEM image of a 1.3 nm-sized nano-cluster, where atomic planes of both the cluster and matrix are resolved.…”

Section: Characterization Of the Nano-oxide Dispersionmentioning

confidence: 99%

Nano-Structured Materials under Irradiation: Oxide Dispersion-Strengthened Steels

et al. 2021

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Oxide dispersion-strengthened materials are reinforced by a (Y, Ti, O) nano-oxide dispersion and thus can be considered as nanostructured materials. In this alloy, most of the nanoprecipitates are (Y, Ti, O) nano-oxides exhibiting a Y2Ti2O7 pyrochlore-like structure. However, the lattice structure of the smallest oxides is difficult to determine, but it is likely to be close to the atomic structure of the host matrix. Designed to serve in extreme environments—i.e., a nuclear power plant—the challenge for ODS steels is to preserve the nano-oxide dispersion under irradiation in order to maintain the excellent creep properties of the alloy in the reactor. Under irradiation, the nano-oxides exhibit different behaviour as a function of the temperature. At low temperature, the nano-oxides tend to dissolve owing to the frequent ballistic ejection of the solute atoms. At medium temperature, the thermal diffusion balances the ballistic dissolution, and the nano-oxides display an apparent stability. At high temperature, the nano-oxides start to coarsen, resulting in an increase in their size and a decrease in their number density. If the small nano-oxides coarsen through a radiation-enhanced Ostwald ripening mechanism, some large oxides disappear to the benefit of the small ones through a radiation-induced inverse Ostwald ripening. In conclusion, it is suggested that, under irradiation, the nano-oxide dispersion prevails over dislocations, grain boundaries and free surfaces to remove the point defects created by irradiation.

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Relaxation path of metastable nanoclusters in oxide dispersion strengthened materials

Cited by 14 publications

References 41 publications

Characterization of polyhedral nano-oxides and helium bubbles in an annealed nanostructured ferritic alloy

Characterization of polyhedral nano-oxides and helium bubbles in an annealed nanostructured ferritic alloy

Nano-oxide precipitation kinetics during the consolidation process of a ferritic oxide dispersion strengthened steel.

Nano-Structured Materials under Irradiation: Oxide Dispersion-Strengthened Steels

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