Details

Autor(en) / Beteiligte

• Gonzalez-Arrabal, R.
• Panizo-Laiz, M.
• Gordillo, N.
• Tejado, E.
• Munnik, F.
• Rivera, A.
• Perlado, J.M.

Titel

Hydrogen accumulation in nanostructured as compared to the coarse-grained tungsten

Ist Teil von

• Journal of nuclear materials, 2014-10, Vol.453 (1-3), p.287-295

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Study of the hydrogen behaviour in nanostructured as compare to coarse grained tungsten samples.•Comparison between single (H), sequentially (C plus H) and simultaneously (C and H) implanted samples.•Study of the stability of the nanostructures after implantation at different temperatures.•Implantation energies for H and C above the displacement damage threshold.•Study of the hydrogen behaviour as a function of the implantation temperature. We report on the influence of sample microstructure and of irradiation conditions on the H behaviour in Tungsten (W). For this purpose, commercial coarse grained (CGW) and nanostructured W (NW) samples were implanted with (i) H at room temperature (RT), (ii) sequentially with C and H at RT, and (iii) simultaneously (co-implanted) with C and H at RT. To study the possible effect of implantation temperature on H behaviour, a CGW sample and a NW sample were sequentially implanted with C at RT and with H at 673K. The H and C implantation fluence was 5×1020m−2 and the implantation energies were 160keV for H and 650keV for C which are above the displacement damage threshold. Scanning electron microscopy images show that nanostructured samples consist of columns with an average diameter of about 100nm. These nanocolumns are stable under the studied implantations conditions. Moreover, surface modification is absent in all studied samples. X-ray diffraction data illustrate that all samples are mono-phase (α-W phase) and that none of the implantations led to the appearance of secondary phases. Resonant nuclear reaction analysis data show that the H retention in NW samples is larger than in CGW and that synergistic effect has a significant influence on the H retention in CGW samples but not in NW samples.