Deuterium thermal desorption from vacancy clusters in tungsten

Ryabtsev, S.; Gasparyan, Yu. M.; Zibrov, M.; Shubina, A.; Писарев, А. А.

doi:10.1016/j.nimb.2016.04.038

Cited by 45 publications

(38 citation statements)

References 24 publications

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“…4bare attributed to large nanovoids (mostly 6 − 15 ), confirming the experimental speculations19,20 . Aside from some minor discrepancy at low temperatures which may contributed by other defects like dislocations or grain boundaries19,20 , our simulations accurately reproduce the experimental observations.…”

supporting

confidence: 82%

“…Combining our predictive model, primary irradiation damage simulations, and object kinetic Monte Carlo method, we carried out multiscale simulations to reproduce the experimental TDS results (details please see Methods and Supplementary Section S4). To make a direct comparison, same irradiation and annealing conditions as those in the experimental studies 19,20 were used in our simulations. As seen in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…However, atomic details of H bubble nucleation, growth and agglomeration processes are difficult or even impossible to observe in-situ. An alternative method to study H bubble formation is to measure H thermal desorption rates during isochronal annealing [19][20][21][22][23] , which provides energetic information of H de-trapping from nanovoids in metals. Nevertheless, H thermal desorption spectra usually relate to multiple types of crystal defects at different depths 24 , therefore difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

“…Thermal desorption spectra of deuterium from W after irradiated by 10 keV/D ions to the fluence of 3 × 10 19 D/m 2 , annealed at (a) 550 K and (b) 800K for 5 min to render small and large nanovoids, implanted with 0.67 keV/D ions to the fluence of 10 19 D/m 2 , then annealed with different heating rates. Lines are multiscale modelling results, while symbols are experimental data from Zibrov et al (open) and Ryabtsev et al (solid)19,20 .…”

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confidence: 99%

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Predictive model of hydrogen trapping and bubbling in nanovoids in bcc metals

Hou

Kong

et al. 2019

Nat. Mater.

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Interplay between hydrogen and nanovoids, despite long-recognized as a central aspect in hydrogen-induced damages in structural materials, remains poorly understood. Focusing on tungsten as a model BCC system, the present study, for the first time, explicitly demonstrated sequential adsorption of hydrogen adatoms on Wigner-Seitz squares of nanovoids with distinct energy levels. Interaction between hydrogen adatoms on the nanovoid surface is shown to be dominated by pairwise power law repulsion. A predictive model was established for quantitative prediction of configurations and energetics of hydrogen adatoms in nanovoids. This model, further combined with equation of states of hydrogen gas, enables prediction of hydrogen molecule formation in nanovoids. Multiscale simulations based on the predictive model were performed, showing excellent agreement with experiments. This work clarifies fundamental physics and provides full-scale predictive model for hydrogen trapping and bubbling in nanovoids, offering long-sought mechanistic insights crucial for understanding hydrogen-induced damages in structural materials.Being the most abundant element in the known universe and a typical product from corrosion, hydrogen (H) exists virtually in all service environments. The exposure of metallic materials to H-rich environments can result in numerous structural damages, including H induced cracking 1, 2 , H induced surface blistering/flaking 3-7 , and H induced porosity/swelling 8-13 , among others. These damages undesirably degrade the structural and mechanical integrity of materials 14-16 , often causing premature and even catastrophic failures 4, 6, 17 , and thus jeopardizing safety and efficiency of many applications. It's generally believed that these damages originate from interactions between H and various lattice defects. One key issue among those interactions is the H interplay with nanovoids, which promotes the formation and growth of mesoscale H bubbles and consequently leads to experimentally observable failures in structural materials 3-11, 15, 16, 18 .

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supporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Predictive model of hydrogen trapping and bubbling in nanovoids in bcc metals

Hou

Kong

et al. 2019

Nat. Mater.

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“…Such carbon-vacancies can effectively trap H isotopes. For instance, DFT calculations predict a H binding energy with carbon-vacancies in TiC of 2.12 eV [27], which is higher than experimentally determined D binding energies with vacancies and vacancy clusters in W [28,29].…”

Section: Discussionmentioning

confidence: 72%

The high-flux effect on deuterium retention in TiC and TaC doped tungsten at high temperatures

Zibrov

Bystrov

Mayer

et al. 2017

Journal of Nuclear Materials

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Samples made of tungsten (W) doped either with titanium carbide (W-1.1TiC) or tantalum carbide (W-3.3TaC) were exposed to a low-energy (40 eV/D), high-flux (1.8-5×10 23 D/m 2 s) deuterium (D) plasma at temperatures of about 800 K, 1050 K, and 1250 K to a fluence of about 1×10 27 D/m 2. The deuterium (D) inventory in the samples was examined by nuclear reaction analysis and thermal desorption spectroscopy. At 800 K the D bulk concentrations and total D inventories in W-1.1TiC and W-3.3TaC were more than one order of magnitude higher compared to that in pure polycrystalline W. At 1050 K and 1250 K the D concentrations in all types of samples were very low (≤10 5 at. fr.); however the D inventories in W-1.1TiC were significantly higher compared to those in W-3.3TaC and pure W. It is suggested that D trapping inside the carbide precipitates and at their boundaries is essential at high temperatures and high incident fluxes, especially in W-1.1TiC.

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