Behavior and properties of helium cavities in ductile-phase-toughened tungsten irradiated with He+ ions at an elevated temperature

Jiang, Weilin; Kovarik, Libor; Kruska, Karen; Fu, Yucheng; Hu, Zhihan; Shao, Lin; Setyawan, Wahyu

doi:10.1016/j.mtla.2023.101789

Title: Behavior and properties of helium cavities in ductile-phase-toughened tungsten irradiated with He⁺ ions at an elevated temperature

Journal Article · 08 May 2023 · Materialia

DOI: https://doi.org/10.1016/j.mtla.2023.101789 · OSTI ID:1974623

^[1]; Kovarik, Libor ^[1];

^[1];

^[2]; Shao, Lin ^[2];

^[1]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Texas A & M Univ., College Station, TX (United States)

Ductile-phase toughened tungsten (DPT W) composites have demonstrated a great potential for plasma-facing components in fusion power systems. These materials can retain the outstanding thermomechanical properties of W while significantly enhancing the fracture toughness. The DPT W composite in this study consists of W particles (88 wt.%) embedded in a ductile NiFeW (12 wt.%) solution matrix. Irradiation of the composite was performed with 90 keV He⁺ ions to 1.0 × 10¹⁷ He⁺/cm² at 973 K. The He cavities formed in both W and NiFeW phases are examined using convergent-beam scanning transmission electron microscopy (CB-STEM) at an atomic-level resolution. Full-range depth profiles of the He cavity diameters and number densities are analyzed. The results show that the average cavity diameter in NiFeW is ~2.7 times that in W, while the number density is an order of magnitude lower. A quantitative analysis of the He density and pressure in the cavities is also achieved using STEM electron energy loss spectroscopy (STEM-EELS) mapping. The He atoms in the cavities in NiFeW are found to be under-pressurized, while those in similar-sized cavities in W are not detectable. Further, the He energy-loss shift exhibits a linear relationship with the He density in cavities in NiFeW, with the slope comparable to that for martensitic steel.

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1974623

Alternate ID(s):: OSTI ID: 2000657; OSTI ID: 1984253

Report Number(s):: PNNL-SA-182610

Journal Information:: Materialia, Journal Name: Materialia Vol. 29; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Behavior and properties of helium cavities in ductile-phase-toughened tungsten irradiated with He+ ions at an elevated temperature

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References (48)

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Title: Behavior and properties of helium cavities in ductile-phase-toughened tungsten irradiated with He⁺ ions at an elevated temperature