Peculiarities of helium bubble formation and helium behavior in vanadium alloys of different chemical composition

Stal’tsov, M. S.; Chernov, I. I.; Kalin, B. A.; Oo, Kyi Zin; Polyansky, A A; Staltsova, O.S.; Aung, Kyaw Zaw; Чернов, В. М.; Потапенко, М. М.

doi:10.1016/j.jnucmat.2014.09.085

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…a significant fraction of helium and vacancies can be retained at 923 K in the lattice of vanadium alloys with "oversized" alloying elements in the form of complicative complexes. An additional effect is the creation of a larger number of bubble nucleation centers which increases bubbles density and reduces the their size [12].…”

Section: Resultsmentioning

confidence: 99%

“…Helium affects the kinetics of vacancy porosity development and void swelling [8] and at high concentrations causes gas swelling [9−11]. As well known, pure vanadium is subject to high level of helium swelling but alloying can significantly reduce it [12,13], but the effect of the doping on the helium porosity development can be ambiguous. This paper presents the results of a study of the helium porosity development and gaseous swelling in ternary alloys of the V-Ti-Cr, V-W-Ta and V-W-Zr systems in comparison with binary vanadium alloys after irradiation by helium ions.…”

Section: Introductionmentioning

confidence: 99%

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Helium Porosity Formation in Vanadium Alloys of V-Ti-Cr, V-W-Zr and V-W-Ta Systems in Comparison with Binary Alloys

Belyaev

Stal’tsov

Chernov

et al. 2018

Kms

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Vanadium alloys are considered candidates for use as structural materials of fusion reactors. A large amount of helium will be accumulated in such materials. The presence of helium in the materials may result in gas swelling. This paper presents the results Alloy V-4%Ti-4%Cr has a smallest helium swelling among the ternary alloys and its swelling is significantly lower than swelling of dual V-Ti and V-Cr alloys. The swelling of the ternary V-2%W-1%Zr alloy is more than 3 times less than the swelling of vanadium, several times less than that of V-W alloys and slightly lower than the swelling of VZr alloys. Swelling increases by a factor of 1.5 with increasing of Zr content to 2% in the ternary V-2%W-1%Zr alloy. Similarly, gas swelling of ternary V-2%W-1%Ta alloy is significantly lower than that for binary V-W and V-Ta alloys.Assumptions are made about the possible mechanisms of the effect of alloying elements in vanadium on helium porosity formation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Helium Porosity Formation in Vanadium Alloys of V-Ti-Cr, V-W-Zr and V-W-Ta Systems in Comparison with Binary Alloys

Belyaev

Stal’tsov

Chernov

et al. 2018

Kms

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“…Additionally, the interface of those nano-scale precipitates with the matrix can act as an effective sink for mobile lattice defects [15,16]. Therefore, the radiation-induced hardening and embrittlement that take place in V-4Cr-4Ti below 400C and at dose levels as low as 0.1-0.5dpa can be reduced.…”

Section: Introductionmentioning

confidence: 99%

“…Ti acts as an effective scavenger for light elements by forming Ti(O,C,N) precipitates during the material's processing [13]. Cold working prior to annealing can be used to minimise the coarsening of the precipitates and increase the thermal creep resistance of the alloy [14].Additionally, the interface of those nano-scale precipitates with the matrix can act as an effective sink for mobile lattice defects [15,16]. Therefore, the radiation-induced hardening and embrittlement that take place in V-4Cr-4Ti below 400C and at dose levels as low as 0.1-0.5dpa can be reduced.…”

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Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

et al. 2017

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We have characterised to atomic resolution the mono-layer thick TiO-type precipitate induced by proton irradiation in V-4Cr-4Ti alloy at the coarsening radiation-induced interstitial a/2⟨111⟩ dislocation loops expected to exert a minimal effect on the precipitate formation. This monolayer-thick precipitate constitutes an early stage in the radiationinduced aging process of V-4Cr-4Ti at low temperatures, and can potentially absorb additional light elements in reactor environments. 1Moor Row, November 24, 2016 Dear Prof. Beyerlein, Please find attached the resubmitted manuscript SMM-16-1716 entitled 'Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation' which has been significantly revised on the basis of the comments received by the reviewers.The detailed response to the reviewers' comments, together with the revised version of the manuscript, is attached. We would like to thank the reviewers for their time and effort in appraising the manuscript. The comments received were pertinent and helpful in improving the manuscript. All the points raised have been addressed and the manuscript has been amended accordingly. We believe that the revisions made adequately address the points raised and should therefore present no further obstacle to publication. We thank the reviewers for carefully reading the manuscript and the useful comments. We have addressed all those comments, which we feel have improved the article's quality.Detailed response:1.) In figure 2, images for SA and SACW irradiated at 350C are necessary for better understanding of temperature effects. We have included additional text in the manuscript about the temperature effect. The novelty and impact of this work lies in the recovery of the CWed structure already at 300°C (Fig. 2) before the formation of monolayer-thick RIPs at 350°C (Fig. 3). 2.) What is the relationship between the observed microstructure and the hardness? For example, for SA irradiated at 300C and 350C, where does the difference in hardening come?We have added some text to clarify the observed hardening behaviour at different temperatures in terms of the observed microstructure. 3.) As the observed RIPs in this study is platelet, the description as "average size" may mislead.We have changed the average size of the monolayer-thick RIPs by their average length. 4.) The description about recovery of the pre-existing dislocation network in SACW is contradicting in page 6 and page 7.We have clarified the contradiction in page 6 and 7. 5.) Direct comparison with the results of neutron-irradiation might be difficult since the damage rate is exceedingly large.We have added some text about the difference in dose rate and particle fluence between neutron and proton irradiation. The formation and evolution of a/2 ⟨111⟩ unfaulted dislocation loops in our proton irradiated samples correspond to the observations reported in neutron-irradiated material. However the average loop size at 350C in the proton irradiated samples (85nm) is lower than the value repo...

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“…Ti was identified as an effective scavenger for interstitials [11], by forming plate-like oxycarbo-nitride precipitates [12][13][14][15]. The additional benefit is that the precipitate/matrix interface could potentially act as an effective sink for radiation-induced lattice defects, such as vacancies, vacancy clusters or dislocation loops, or for transmutant helium atoms [16,17]. Unfortunately, a unified view about the local structure and chemistry of these nano-precipitates is still lacking.…”

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confidence: 99%

Atomically resolved chemical ordering at the nm-thick TiO precipitate/matrix interface in V-4Ti-4Cr alloy

et al. 2017

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We have used advanced analytical electron microscopy to characterise the local structure and 4 chemistry at the interface between nm-thick TiO precipitates and the V-based matrix in a 6 V-4Ti-4Cr alloy. Our results reveal the presence of an intergrowth between the fcc TiO and 8 bcc vanadium structures, with a repeat lattice distance that equals 2.5 times the vanadium lattice parameter along the c-axis. Our atomic resolution analysis of the interface will impact the mechanistic understanding of its interaction with interstitials and radiation-induced lattice defects, and consequently trigger the development of improved alloy structures with interfaces engineered for enhanced radiation tolerance.

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Peculiarities of helium bubble formation and helium behavior in vanadium alloys of different chemical composition

Cited by 16 publications

References 10 publications

Helium Porosity Formation in Vanadium Alloys of V-Ti-Cr, V-W-Zr and V-W-Ta Systems in Comparison with Binary Alloys

Helium Porosity Formation in Vanadium Alloys of V-Ti-Cr, V-W-Zr and V-W-Ta Systems in Comparison with Binary Alloys

Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

Atomically resolved chemical ordering at the nm-thick TiO precipitate/matrix interface in V-4Ti-4Cr alloy

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