Kinetic properties of small He–vacancy clusters in iron

Бородин, В. А.; Vladimirov, P.

doi:10.1016/j.jnucmat.2008.12.070

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…However, in short range order, cavities close to one another may move and coalescence in a more pronounced way when the density of small cavities is as high as that detected in this paper. These observations fit with the results obtained in modelling works regarding the relation between complexity defect and mobility [2,57].…”

Section: Discussionsupporting

confidence: 89%

Nanoindentation and TEM to Study the Cavity Fate after Post-Irradiation Annealing of He Implanted EUROFER97 and EU-ODS EUROFER

et al. 2018

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The effect of post-helium irradiation annealing on bubbles and nanoindentation hardness of two reduced activation ferritic martensitic steels for nuclear fusion applications (EUROFER97 and EU-ODS EUROFER) has been studied. Helium-irradiated EUROFER97 and EU-ODS EUROFER were annealed at 450 °C for 100 h in an argon atmosphere. The samples were tested by nanoindentation and studied by transmission electron microscopy extracting some focused ion beam lamellae containing the whole implanted zone (≈50 µm). A substantial increment in nanoindentation hardness was measured in the area with higher helium content, which was larger in the case of EUROFER97 than in EU-ODS EUROFER. In terms of microstructure defects, while EU-ODS EUROFER showed larger helium bubbles, EUROFER97 experienced the formation of a great population density of them, which means that the mechanism that condition the evolution of cavities for these two materials are different and completely dependent on the microstructure.

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Section: Discussionsupporting

confidence: 89%

Nanoindentation and TEM to Study the Cavity Fate after Post-Irradiation Annealing of He Implanted EUROFER97 and EU-ODS EUROFER

et al. 2018

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“…Furthermore, we have calculated the binding energy of helium atom with a Be vacancy of 2.402 eV, which suggests that the substitutional helium atom is almost irreversibly trapped by vacancy and requires another vacancy for diffusion. This prediction is confirmed by Vladimirov et al, 18,36 who found that the substitutional helium only diffuses as a vacancy cluster and the diffusion barrier is in the range of 0.7 eV ∼ 1.6 eV in the basal plane. This results in the quick and efficient capture of interstitial helium atoms by vacancies, and diffusion coefficient is thus reduced greatly.…”

Section: Diffusion Coefficientssupporting

confidence: 61%

First-principles study of migration and diffusion mechanisms of helium in α-Be

Yang

et al. 2016

AIP Advances

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The behavior of interstitial helium in α-Be has been studied with first-principles method. It is found that the most favored position for helium is the basal octahedral (BO) site, closely followed by the basal tetrahedral (BT) site, in agreement with previous predictions. The interaction energy between the helium and the neighborhood Be atoms and the deformation energy of α-Be matrix are calculated. The feasible minimum-energy pathways (MEP) of interstitial helium atoms in α-Be matrix and the corresponding atomic structures of the saddle points associated with the each MEP are investigated. The temperature-dependent diffusion coefficients have also been predicted. It is confirmed that the interstitial helium diffuses two-dimensionally at low temperatures; however, it can diffuse three-dimensionally at higher temperatures. Besides, the microscopic parameters in the pre-factor and activation energy of the diffusion coefficients are obtained. Both diffusion coefficients are higher than the available experiment data, which may attribute to the fact that under real condition the diffusion is not free, i.e. the actual α-Be matric has various defects and impurities which heavily affect the diffusion of helium. Therefore, our theoretical prediction is the upper bound for helium diffusion in α-Be matrix.

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“…The phase transformation has also been studied by various groups 34 35 36 . To study the behavior of these irradiation defects (the interstitial atoms, vacancy), other researchers have studied the formation energy and the binding energy using simulation calculations 37 38 .…”

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confidence: 99%

Mechanical properties and microstructural change of W–Y2O3 alloy under helium irradiation

Tan

Luo

Chen

et al. 2015

Sci Rep

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A wet-chemical method combined with spark plasma sintering was used to prepare a W–Y2O3 alloy. High-temperature tensile tests and nano-indentation microhardness tests were used to characterize the mechanical properties of the alloy. After He-ion irradiation, fuzz and He bubbles were observed on the irradiated surface. The irradiation embrittlement was reflected by the crack indentations formed during the microhardness tests. A phase transformation from α-W to γ-W was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Polycrystallization and amorphization were also observed in the irradiation damage layer. The W materials tended to exhibit lattice distortion, amorphization, polycrystallization and phase transformation under He-ion irradiation. The transformation mechanism predicted by the atomic lattice model was consistent with the available experimental observations. These findings clarify the mechanism of the structural transition of W under ion irradiation and provide a clue for identifying materials with greater irradiation resistance.

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Kinetic properties of small He–vacancy clusters in iron

Cited by 12 publications

References 11 publications

Nanoindentation and TEM to Study the Cavity Fate after Post-Irradiation Annealing of He Implanted EUROFER97 and EU-ODS EUROFER

Nanoindentation and TEM to Study the Cavity Fate after Post-Irradiation Annealing of He Implanted EUROFER97 and EU-ODS EUROFER

First-principles study of migration and diffusion mechanisms of helium in α-Be

Mechanical properties and microstructural change of W–Y2O3 alloy under helium irradiation

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