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

Stan, Tiberiu; Wu, Yuan; Ciston, Jim; Yamamoto, Takuya; Odette, G.R.

doi:10.1016/j.actamat.2019.10.045

Cited by 30 publications

(9 citation statements)

References 46 publications

(46 reference statements)

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“…A similar effect has been reported in the literature for steels containing nanoparticles of other oxide compositions (e.g. ZrO2, HfO2 and Y2TiO7 [38,39]) and seems to be a general trend for He bubbles on oxide particles. To characterize the effect in quantitative terms, the measured diameters of cavities on oxide particles are plotted in Fig.…”

Section: (A) (B)supporting

confidence: 88%

Bubble-to-void transition promoted by oxide nanoparticles in ODS-EUROFER steel ion implanted to high He content

Emelyanova

Gentils

Бородин

et al. 2021

Journal of Nuclear Materials

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The paper deals with a detailed study of He-filled cavity ensemble development in ODS-Eurofer steel implanted with 10 keV helium ions to a high peak concentration of 8.5×10 3 appm both with and without simultaneous irradiation with 4MeV gold ions, which allowed us to strongly vary the ratios of dpa/He introduction. The subsequent transmission electron microscopy examination reveals excellent radiation stability of He-implanted sample in the single-beam implantation mode. In contrast, after the simultaneous dual-beam irradiation the occurrence of a bubble-to-void transition was observed for bubbles that were associated with yttria nanoparticles.The relative importance of different He bubble families observed in the He-implanted samples for the swelling accumulation is quantitatively assessed, emphasizing the potential risks of abrupt swelling acceleration in the case of bubble-to-void transition launched by nanoparticles. A model of bubble-to-void transition for gas bubbles associated with spherical second-phase particles is developed and used to rationalize experimental observations.

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Section: (A) (B)supporting

confidence: 88%

Bubble-to-void transition promoted by oxide nanoparticles in ODS-EUROFER steel ion implanted to high He content

Emelyanova

Gentils

Бородин

et al. 2021

Journal of Nuclear Materials

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“…H magnification imaging of these areas using bright-field TEM, as shown in Figure vealed nano-oxides as small as 2 nm Ø within ~10 μm of the weld lines. The sq appearance of the nano-oxides, highlighted in Figure 6c, suggests the presence o energy, semi-coherent interfaces with the NFA matrix-likely cube-on-cube ( 10 100 Y-Ti-O, 〈100〉Fe ∥ 〈110〉Y-Ti-O) or cube-on-edge ( 100 Fe ∥ 110 Y-Ti-O, 〈10 〈100〉Y-Ti-O) orientation relationships described in previous reports [60,71]. These faces (i.e., the sides of the "squares") become evident when imaging near 〈100〉 or zone-axes.…”

Section: Dispersoidssupporting

confidence: 64%

Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique

Lear

Gigax

Schneider

et al. 2021

Metals

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Joining nanostructured ferritic alloys (NFAs) has proved challenging, as the nano-oxides that provide superior strength, creep resistance, and radiation tolerance at high temperatures tend to agglomerate, redistribute, and coarsen during conventional fusion welding. In this study, capacitive discharge resistance welding (CDRW)—a solid-state variant of resistance welding—was used to join end caps and thin-walled cladding tubes of the NFA 14YWT. The resulting solid-state joints were found to be hermetically sealed and were characterized across the weld region using electron microscopy (macroscopic, microscopic, and nanometer scales) and nanoindentation. Microstructural evolution near the weld line was limited to narrow (~50–200 μm) thermo-mechanically affected zones (TMAZs) and to a reduction in pre-existing component textures. Dispersoid populations (i.e., nano-oxides and larger oxide particles) appeared unchanged by all but the highest energy and power CDRW condition, with this extreme producing only minor nano-oxide coarsening (~2 nm → ~5 nm Ø). Despite a minimal microstructural change, the TMAZs were found to be ~10% softer than the surrounding base material. These findings are considered in terms of past solid-state welding (SSW) efforts—cladding applications and NFA-like materials in particular—and in terms of strengthening mechanisms in NFAs and the potential impacts of localized temperature–strain conditions during SSW.

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“…These properties lead to a great increase of thermal creep resistance [2,[9][10][11] as well as yield strength [2,4,12]. Moreover, the nano-oxidesmatrix interfaces efficiently trap He bubbles created from transmutations occurring under neutron irradiation, mitigating the irradiation-induced damage [13,14].…”

Section: Introductionmentioning

confidence: 99%

Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

et al. 2022

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

Cited by 30 publications

References 46 publications

Bubble-to-void transition promoted by oxide nanoparticles in ODS-EUROFER steel ion implanted to high He content

Bubble-to-void transition promoted by oxide nanoparticles in ODS-EUROFER steel ion implanted to high He content

Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique

Chemical and structural evolution of nano-oxides from mechanical alloying to consolidated ferritic oxide dispersion strengthened steel

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