Behavior of helium cavities in ion-irradiated W-Ni-Fe ductile-phase toughened tungsten

Jiang, Weilin; Zhang, Dalong; Li, Dongsheng; Heo, Jaeyoung; Wang, Zhiqiang; Zhang, Limin; Overman, Nicole R.; Varga, Tamas; Hu, Zhihan; Wang, Xuemei; Shao, Lin; Setyawan, Wahyu

doi:10.1016/j.jnucmat.2022.153565

Title: Behavior of helium cavities in ion-irradiated W-Ni-Fe ductile-phase toughened tungsten

Journal Article · 28 January 2022 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2022.153565 · OSTI ID:1988618

^[1]; Zhang, Dalong ^[1];

^[1]; Heo, Jaeyoung ^[1]; Wang, Zhiqiang ^[2]; Zhang, Limin ^[2]; Overman, Nicole R. ^[1];

^[1]; Hu, Zhihan ^[3]; Wang, Xuemei ^[3]; Shao, Lin ^[3];

^[1]

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

This study reports on the distribution of helium (He) cavities in a hot-rolled W-Ni-Fe ductile-phase toughened tungsten (DPT W) composite irradiated to a dose and a helium concentration that are comparable to those in the material after 5-year irradiation in a conceptual fusion power plant. Here, the DPT W sample consists of W particles embedded in a ductile-phase NiFeW matrix with a nominal composition of 90W-7Ni-3Fe by weight. It was hot-rolled to a thickness reduction by 87% (87R DPT W). Sequential irradiation of the material with 1.2 MeV Ni⁺ ions to a fluence of 2.15×10¹⁶ Ni⁺/cm² and 90 keV He⁺ ions to 6.5×10¹⁵ He₊/cm₂ was performed at 973 K. Larger He cavities with a lower number density are observed in NiFeW than W. Helium cavities are aggregated preferentially along the NiFeW/W interphase boundary. This behavior is not observed along the W/W grain boundary under the same irradiation conditions. A similar distribution of He cavities with comparable sizes is observed in 87R DPT W irradiated with He⁺ ions only, suggesting that the He cavity distribution is not significantly affected by pre-irradiation of Ni⁺ ions at 973 K. The data from this study does not provide any evidence for formation of visible voids or Ni precipitates in W phase irradiated with Ni⁺ ions only. Diffusion and clustering of He atoms and mobile vacancies during ion irradiation at 973 K are responsible for the formation and growth of the He cavities.

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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), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1988618

Report Number(s):: PNNL-SA-166763

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 561; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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