Effects of transition metal carbide dispersoids on helium bubble formation in dispersion-strengthened tungsten

Saefan, Ashrakat; Liu, Xingyu; Lang, Eric; Higgins, Levko; Wang, Yongqiang; El-Atwani, Osman; Allain, Jean Paul; Wang, Xing

doi:10.1038/s41598-023-40421-0

Title: Effects of transition metal carbide dispersoids on helium bubble formation in dispersion-strengthened tungsten

Journal Article · 15 August 2023 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-023-40421-0 · OSTI ID:2217251

Saefan, Ashrakat; Liu, Xingyu; Lang, Eric; Higgins, Levko; Wang, Yongqiang; El-Atwani, Osman; Allain, Jean Paul; Wang, Xing

Abstract The formation of helium bubbles and subsequent property degradation poses a significant challenge to tungsten as a plasma-facing material in future long-pulse plasma-burning fusion reactors. In this study, we investigated helium bubble formation in dispersion-strengthened tungsten doped with transition metal carbides, including TaC, ZrC, and TiC. Of the three dispersoids, TaC exhibited the highest resistance to helium bubble formation, possibly due to the low vacancy mobility in the Group VB metal carbide and oxide phases. Under identical irradiation conditions, large helium bubbles formed at grain boundaries in tungsten, while no bubbles were observed at the interfaces between the carbide dispersoid and tungsten matrix. Moreover, our results showed the interfaces could suppress helium bubble formation in the nearby tungsten matrix, suggesting that the interfaces are more effective in trapping helium as tiny clusters. Our research provided new insights into optimizing the microstructure of dispersion-strengthened tungsten alloys to enhance their performance.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001; SC0014267; SC0021005

OSTI ID:: 2217251

Report Number(s):: LA-UR--23-29342; 13352; PII: 40421

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 13; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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