Comparison of atom probe tomography and transmission electron microscopy analysis of oxide dispersion strengthened steels

London, Andrew J.; Lozano-Pérez, Sergio; Santra, S.; Amirthapandian, S.; Panigrahi, B. K.; Sundar, C. S.; Grovenor, C.R.M.

doi:10.1088/1742-6596/522/1/012028

Cited by 13 publications

(9 citation statements)

References 12 publications

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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.…”

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confidence: 96%

“…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]. Most of these characterizations were performed on HIPed or HEed materials, and the precipitation kinetics of the nano-oxides is still not completely understood.…”

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confidence: 99%

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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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confidence: 96%

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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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“…London et al . showed that Cr could form a shell around oxide particles, leading to particles with a very small size and increased number density 28 . The composition of the oxide particles was determined to be ~9% Al, 12% Co, 9% Cr, 13% Cr, 16% Fe, 20% Ni, 10% Y and 10% O (all in at%).…”

Section: Resultsmentioning

confidence: 99%

High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids

Gwalani

Pohan

Lee

et al. 2018

Sci Rep

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A significant increase in compressive yield strength of the AlCoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.% YO. The HEAs were processed using spark plasma sintering of mechanically alloyed powders. Transmission electron microscopy and atom probe tomography confirmed the presence of compositionally complex nano-dispersoids in the YO-added HEA. The significant increase in strength can be attributed to the nano-dispersoid strengthening coupled with grain refinement. Therefore, the in-situ formation of the compositionally complex nanoscale dispersoids during the alloy processing could be a novel approach to create entropy-stabilized oxide particles in strengthening of HEAs.

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“…If such is the case, an implantation of Ti at higher fluence would likely lead towards the formation of stoichiometric pyrochlore precipitates that have similar structure to and higher atomic density than yttria precipitates, as frequently observed in Ti-doped ODS steels [ 34 , 46 , 47 , 48 , 49 ]. In these steels, the main oxide precipitates have been demonstrated to be Y 2 Ti 2 O 7 and Y 2 TiO 5 [ 9 , 46 , 50 , 51 ], whilst the shortage of Ti has been shown in a number of instances to lead to the formation of Y 2 TiO 5 [ 46 , 52 ]. Thus, with both Ti and Y implanted in the FeCr matrix, Y 2 TiO 5 precipitates would be expected, rather than Y 2 O 3 precipitates enriched in Ti.…”

Section: Discussionmentioning

confidence: 99%

“…In the present results of triple-ion implantation, when Y is implanted first, the characteristics of the obtained precipitates are thus very similar to those in ODS steels undoped with Ti: Yttria precipitates are obtained with specific fine features recurrently observed in conventional ODS steels that are particularly well reproduced after annealing at 1100 °C. A Cr-rich shell [ 15 , 44 , 51 ], as well as an apparently cuboidal shape of yttria precipitates with the main facets parallel to {200} matrix planes [ 34 , 62 ] are, for example, evidenced. Note that the shape of precipitates could actually be more complex than cuboidal, as shown in a study that revealed (Y, Ti)-rich precipitates with similar morphology to ours when the matrix was oriented along a [001] zone axis, and which revealed a truncated rhombic dodecahedron shape defined by the {100} and {110} matrix planes with observations on other matrix orientations [ 63 ].…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Nano-Oxide Precipitates by Implantation of Ti, Y and O Ions in Fe-10%Cr: Towards an Understanding of Precipitation in Oxide Dispersion-Strengthened (ODS) Steels

et al. 2022

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The properties of oxide dispersion-strengthened steels are highly dependent on the nature and size distribution of their constituting nano-oxide precipitates. A fine control of the processes of synthesis would enable the optimization of pertinent properties for use in various energy systems. This control, however, requires knowledge of the precise mechanisms of nucleation and growth of the nanoprecipitates, which are still a matter of debate. In the present study, nano-oxide precipitates were produced via the implantation of Y, Ti, and O ions in two different sequential orders in an Fe-10%Cr matrix that was subsequently thermally annealed. The results show that the oxides that precipitate are not necessarily favoured thermodynamically, but rather result from complex kinetics aspects related to the interaction between the implanted elements and induced defects. When Y is implanted first, the formation of nanoprecipitates with characteristics similar to those in conventionally produced ODS steels, especially with a core/shell structure, is evidenced. In contrast, when implantation starts with Ti, the precipitation of yttria during subsequent high-temperature annealing is totally suppressed, and corundum Cr2O3 precipitates instead. Moreover, the systematic involvement of {110} matrix planes in orientation relationships with the precipitates, independently of the precipitate nature, suggests matrix restriction effects on the early stages of precipitation.

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Comparison of atom probe tomography and transmission electron microscopy analysis of oxide dispersion strengthened steels

Cited by 13 publications

References 12 publications

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

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

High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids

Synthesis of Nano-Oxide Precipitates by Implantation of Ti, Y and O Ions in Fe-10%Cr: Towards an Understanding of Precipitation in Oxide Dispersion-Strengthened (ODS) Steels

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