Thermal annealing behavior of hydrogen and surface topography of H2+ ion implanted tungsten

Zhang, Jiandong; Jiang, Weilin; Zhu, Zihua; Shao, Lin; Price, Lloyd; Zhao, Jiangtao; Wang, Tieshan

doi:10.1080/00223131.2018.1428126

Thermal annealing behavior of hydrogen and surface topography of H₂⁺ ion implanted tungsten

Journal Article · 25 January 2018 · Journal of Nuclear Science and Technology (Tokyo)

DOI:https://doi.org/10.1080/00223131.2018.1428126· OSTI ID:1439693

^[1]; Jiang, Weilin ^[2]; Zhu, Zihua ^[2]; Shao, Lin ^[3]; Price, Lloyd ^[3]; Zhao, Jiangtao ^[4]; Wang, Tieshan ^[4]

School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China; Pacific Northwest National Laboratory, Richland, WA, USA
Pacific Northwest National Laboratory, Richland, WA, USA
Department of Nuclear Engineering, Texas A&,M University, College Station, TX, USA
School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China

Tungsten (W) has been proposed as a plasma-facing material (PFM) in fusion reactors due to its outstanding properties. Degradation of the material properties is expected to occur as a result of hydrogen (H) isotope permeation and trapping in W. In this study, two polycrystalline W plates were implanted with 80 keV H₂⁺ ions to a fluence of 2E21 H+/m2 at room temperature (RT). Time-of-flight secondary ion mass spectrometry (ToF-SIMS), focused ion beam (FIB) and scanning electron microscopy (SEM) were used for sample characterization. The SIMS data shows that H atoms are distributed well beyond the ion projected range. Isochronal annealing appears to suggest two H release stages that might be associated with the reported activation energies. H release at RT was observed between days 10 and 70 following ion implantation, and the level was maintained over the next 60 days. In addition, FIB/SEM results exhibit H2 blister formation near the surface of the as-implanted W. The blister distribution remains unchanged after thermal annealing up to 600 °C.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1439693

Report Number(s):: PNNL-SA-131482; AT2030110

Journal Information:: Journal of Nuclear Science and Technology (Tokyo), Vol. 55, Issue 7; ISSN 0022-3131

Publisher:: Taylor & Francis

Country of Publication:: United States

Language:: English

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