Hydrogen retention properties of polycrystalline tungsten and helium irradiated tungsten

Hino, Tomoaki; Koyama, Kazunori; Yamauchi, Yuji; Hirohata, Yuko

doi:10.1016/s0920-3796(98)00157-4

Cited by 47 publications

(36 citation statements)

References 6 publications

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“…The practical use of tungsten is hindered by its high ductile-to-brittle transition temperature (DBTT). Therefore, tungsten alloys with better machinability are considered to be used instead [2]. However, the retention of hydrogen isotopes (including radioactive tritium) in binary tungsten alloys has not been extensively studied to date [3,4].…”

Section: Introductionmentioning

confidence: 99%

Deuterium retention in tungsten and tungsten–tantalum alloys exposed to high-flux deuterium plasmas

Zayachuk¹,

Hoen²,

Emmichoven³

et al. 2012

Nucl. Fusion

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A direct comparison of deuterium retention in samples of tungsten and two grades of tungsten-tantalum alloys-W1%Ta and W-5%Ta, exposed to deuterium plasmas (ion flux ∼10 24 m −2 s −1 , ion energy at the biased target ∼50 eV) at the plasma generator Pilot-PSI was performed using thermal desorption spectroscopy (TDS). No systematic difference in terms of total retention in tungsten and tungsten-tantalum was identified. The measured retention value for each grade did not deviate by more than 24% from the value averaged over the three grades exposed to the same conditions. No additional desorption peaks appeared in the TDS spectra of the W-Ta samples as compared with the W target, indicating that no additional kinds of traps are introduced by the alloying of W with Ta. In the course of the experiment the same samples were exposed to the same plasma conditions several times, and it is demonstrated that samples with the history of prior exposures yield an increase in deuterium retention of up to 130% under the investigated conditions compared with the samples that were not exposed before. We consider this as evidence that exposure of the considered materials to ions with energy below the displacement threshold generates additional traps for deuterium. The positions of the release peaks caused by these traps are similar for W and W-Ta, which indicates that the corresponding traps are of the same kind.

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Section: Introductionmentioning

confidence: 99%

Deuterium retention in tungsten and tungsten–tantalum alloys exposed to high-flux deuterium plasmas

Zayachuk¹,

Hoen²,

Emmichoven³

et al. 2012

Nucl. Fusion

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show abstract

“…6. Comparison of results from a representative problem computation (solid line) with experimental data from Hino et al [3]. Total calculated result includes surface diffusive flux and temperaturedependent background signal.…”

Section: Discussionmentioning

confidence: 99%

“…To exercise the model, an experimental result of Hino et al [3] was selected for approximation. In this experiment, 3 H was implanted at 5 keV and a flux of 1 x 10 19 H/m 2 s for 5,000 seconds into a polycrystalline tungsten foil 50 x 50 mm 2 and 0.1 mm thick at room temperature.…”

Section: Simulation Of Experimentsmentioning

confidence: 99%

“…In this experiment, 3 H was implanted at 5 keV and a flux of 1 x 10 19 H/m 2 s for 5,000 seconds into a polycrystalline tungsten foil 50 x 50 mm 2 and 0.1 mm thick at room temperature. Background pressure in the implantation chamber was 10 -3 Pa while the implantation was going on and 10 -5 Pa at other times.…”

Section: Simulation Of Experimentsmentioning

confidence: 99%

“…The diffusion boundary condition employed was Sieverts' law with Frauenfelder [3] solubility. Three traps were assumed in the sample.…”

Section: Simulation Of Experimentsmentioning

confidence: 99%

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