Examination of Early-Stage Helium Retention and Release in Dispersion-Strengthened Tungsten Alloys

Lang, Eric; Taylor, Chase N.; Madden, Nathan; Marchhart, Trevor; Smith, Charles S.; Wang, Xing; Krogstad, Jessica A.; Allain, Jean Paul

doi:10.1080/15361055.2022.2164444

Cited by 4 publications

(1 citation statement)

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“…The desorption of He from W grain interiors usually occurs in the temperature of 400–1000 K and the desorption of trapped He at the grain boundaries occurs at about 1350 K 37 , 38 . In a TDS study of W doped with 1–10 wt% TiC, TaC, and ZrC, people found that He desorption was not completed even the samples were heated up to 1350 K 39 . Considering that the W-dispersoid interfaces can trap He to some extent, it is unlikely for the He to desorb completely from the interface during this in-situ TEM annealing experiment at 900 °C (~ 1173 K).…”

Section: Resultsmentioning

confidence: 99%

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

Saefan

Liu

Lang

et al. 2023

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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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Section: Resultsmentioning

confidence: 99%