Dislocations mediate hydrogen retention in tungsten

Terentyev, D.; Dubinko, V.I.; Bakaev, A.; Zayachuk, Y.; Renterghem, W. Van; Grigorev, Petr

doi:10.1088/0029-5515/54/4/042004

Cited by 108 publications

(83 citation statements)

References 26 publications

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“…Thus, dislocations (and dislocation junctions) are suggested to act as nucleation sites for stable H bubbles. The interaction strength of H with a newly formed jog on a dislocation is very similar to vacancy-H, as was confirmed by ab initio calculations in [9]. Further growth of H-jog clusters and accumulation of vacancy jogs will lead to the formation of a nanometric cavity-like defect.…”

Section: Introductionsupporting

confidence: 62%

“…The main parameter of the model that defines the release rate of H from a certain type of a trapping defect is the binding energy (E b ). As mentioned before, ab initio calculations showed that dislocation jogs exhibit trapping properties similar to vacancies [9]. The corresponding value of the binding energy is 1.24 eV for one H atom and it decreases with an increase of H atoms trapped at the jog.…”

Section: Model Descriptionsupporting

confidence: 53%

“…While, if only large defects contribute to the TDS spectra, it is very likely that other mechanisms (such as triple junctions, natural porosity, etc) but dislocationdriven trapping govern H retention and bubble formation. Thresold for bubble nucleation Dislocation density ρ = 0.5x10 12 low flux high flux [9] Incident flux (m -2 s -1 ) Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

“…An alternative model of plasma-induced dislocation-driven bubble formation was proposed recently on the basis of ab initio calculations [9]. It was demonstrated that H atoms are attracted to a screw dislocation core and exhibit fast one-dimensional migration along the dislocation line.…”

Section: Introductionmentioning

confidence: 99%

“…Theses defects will exhibit extended open volume, and thus, H interaction with such traps will be similar to nano-voids and cavities. The role of dislocations in bubble formation was validated in recent experiments involving the plasma exposure of annealed and plastically deformed W samples [9,10]. Based on the dislocation-driven nucleation, a numerical simulation tool was developed and used to predict the conditions for the bubble formation depending on exposure temperature and flux [11].…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of TDS spectra under high and low flux plasma exposure conditions

et al. 2016

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Recently developed numerical model, based on the dislocation-driven nucleation of gas bubbles, is used to analyse experimental results on deuterium retention in tungsten under ITER relevant plasma exposure conditions. Focus is put on understanding the relation between exposure temperature and flux on primary features of thermal desorption spectra: peak positions and intensities of the desorption flux. The model allows one to relate the peak positions with the size of plasma induced deuterium bubbles and envisage exposure conditions (temperature and flux) for their formation. Based on the performed analysis, dedicated experimental conditions to validate the model are proposed.

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Section: Introductionsupporting

confidence: 62%

Section: Model Descriptionsupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of TDS spectra under high and low flux plasma exposure conditions

et al. 2016

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Interplay between the Edge Dislocation and Hydrogen in Tungsten at Electronically Excited States

Wang

Ding

et al. 2023

Advanced Physics Research

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Under the continuous irradiation of high‐density and high‐energy photons from the plasma core of a fusion reactor, the plasma‐facing materials (PFMs) of tungsten (W) are in electronically excited states. How hydrogen (H) interacts with defective PFMs in an electronically excited state is an open question. The authors report the developed W‐H tight‐binding (TB) potential model and employ this model to systemically investigate the interaction between an edge dislocation in tungsten with H at different electronically excited states. With the enhancement of electronic excitation, the strong attraction of the dislocation core to H slightly fluctuates, while the attraction to H is significantly enhanced in the region outside the dislocation core. When the electronic excitation energy is ≈0.86 eV, the region of tensile stress can trap H without additional energy. Additionally, the electronic excitation simultaneously makes H migration easy. It is revealed that the transfer of partial energy of the excited electrons to the lattice leads to the nonthermal expansion of the system and affects the interaction between the edge dislocation and H. These results not only show the nonthermal effect of tuning the interaction between hydrogen and the edge dislocation in tungsten but also uncover the nature underlying these phenomena.

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