Gonflement du nickel irradie par des ions Ni+ de moyenne energie

Delaplace, Joseph; Azam, N.; Naour, L. Le; Lott, M.; Fiche, C.

doi:10.1016/0022-3115(73)90084-6

Cited by 21 publications

(4 citation statements)

References 6 publications

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“…4). Such a dependence is in agreement with that observed in pure rtluminium [17]. In all cases the dose dependence of n is rather slight and no void swelling "saturation" effects were found up to 50 dpa in the model considered.…”

Section: Resultssupporting

confidence: 89%

Void growth kinetics in irradiated metals

Bondarenko

Konobeev

1976

Phys. Stat. Sol. (a)

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Void and interstitial dislocation loop nucleation and growth in a metal irradiated by fast particles are theoretically investigated on the basis of the kinetic equations for cluster size distribution functions. It is assumed that (i) the dislocations and dislocation loops are the preferential sinks for interstitials; (ii) the point defect clusters (voids and dislocation loops) grow by means of absorption and emission of monodefects; (iii) the nucleation of point defect clusters is a homogeneous one. It is shown that the dose and temperature dependences of the void size distribution function are qualitatively described by the theory presented. But the classical theory of the homogeneous nucleation used leads to results being in a serious contradiction to the experiments: 1. void concentrations found by numerical calculation for metal parameters close to those for pure nickel are two or three orders of magnitude higher than the usually observed values; 2. the interstitial loop concentration increases with increasing irradiation temperature; 3. at a low initial dislocation density the dose dependence of swelling is linear in contradiction to a sharper dependence observed in austenitic stainless steels. There is no tendency for swelling saturation up to a dose of 50 dpa in the theoretical model under consideration. The results of the present paper reveal the need for a serious revision of existing dislocation loop nucleation mechanisms.

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Section: Resultssupporting

confidence: 89%

Void growth kinetics in irradiated metals

Bondarenko

Konobeev

1976

Phys. Stat. Sol. (a)

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“…Apart from these studies, to the best of our knowledge, a detailed analysis of void swelling behaviour induced by helium during ion irradiations on high purity bcc Fe is not available in the literature. However, a large void swelling data set after ion and neutron irradiations is present in the literature for steels and other metallic materials where in majority of the cases enhanced void swelling occurred due to helium [16 -22] and in many other cases reduced swelling was observed [11,15,[23][24][25]. This symbolises that helium may have a dual role on swelling.…”

Section: Introductionmentioning

confidence: 99%

Effect of chromium on void swelling in ion irradiated high purity Fe–Cr alloys

et al. 2016

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International audienceThe concentration of chromium (Cr) plays an important role on the radiation induced microstructure of the binary Fe–Cr alloys, in particular on the formation of cavities leading to void swelling of the material. Many fast neutron irradiations were performed in the past to understand the swelling variation as a function of the Cr content. However, due to some contrasting results in the literature, the trend is not yet clear. For that purpose, we have performed self-ion irradiations to high doses (>100 dpa) at 773 K, in single beam mode (damage by 2 MeV self ions) and dual beam mode (damage by 2 MeV self-ions and co-implantation of 2 MeV helium ions with continuous energy degradation) on a wide range of high purity Fe–Cr alloys with Cr level ranging from 3 wt.% to 14 wt.% and a reference body centred cubic (bcc) iron (Fe). Conventional transmission electron microscopy (TEM) analysis revealed a strong swelling suppression by the addition of 3 wt.% Cr to the Fe matrix. The analysis of the dual beam irradiated samples revealed that the variation of void swelling as a function of the Cr content is non-monotonic, with a local swelling maxima around 9–10 wt.% Cr. Overall, all the Fe–Cr alloys up to 14 wt.% Cr show much reduced swelling as compared to bcc Fe. No cavities, and hence, swelling, was noted in the single beam irradiated Fe–Cr alloys, while the same in bcc Fe remained high. This elucidates further the large magnitude of swelling reduction by Cr

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“…Apart from these studies, to the best of our knowledge, a detailed analysis of void swelling behaviour induced by helium during ion irradiations on high purity α-Fe is not available in the literature. However, a large void swelling data set after ion and neutron irradiations is present for steels and other metallic materials where in majority of the cases enhanced void swelling occurred due to helium [12][13][14][15][16][17][18] and in some other cases reduced swelling was observed [10,11,[19][20][21]. This symbolizes that helium may both increase or decrease swelling.…”

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confidence: 99%

Dramatic reduction of void swelling by helium in ion-irradiated high purity α-iron

Bhattacharya

Meslin

Henry

et al. 2018

Materials Research Letters

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Effect of helium on void swelling was studied in high-purity α-iron, irradiated using energetic selfions to 157 displacements per atom (dpa) at 773 K, with and without helium co-implantation up to 17 atomic parts-per-million (appm) He/dpa. Helium is known to enhance cavity formation in metals in irradiation environments, leading to early void swelling onset. In this study, microstructure characterization by transmission electron microscopy revealed compelling evidence of dramatic swelling reduction by helium co-implantation, achieved primarily by cavity size reduction. A comprehensive understanding of helium induced cavity microstructure development is discussed using sink strength ratios of dislocations and cavities. IMPACT STATEMENTReduction of void swelling by helium co-implantation is reported, highlighting that it's not always true that swelling will be higher in metals when helium is present along with irradiation damage.

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Gonflement du nickel irradie par des ions Ni+ de moyenne energie

Cited by 21 publications

References 6 publications

Void growth kinetics in irradiated metals

Void growth kinetics in irradiated metals

Effect of chromium on void swelling in ion irradiated high purity Fe–Cr alloys

Dramatic reduction of void swelling by helium in ion-irradiated high purity α-iron

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