Origin of increased helium density inside bubbles in Ni(1−x)Fex alloys

F. Granberg; X. Wang; D. Chen; K. Jin; Y. Wang; H. Bei; W. J. Weber; Y. Zhang; K. L. More; K. Nordlund; F. Djurabekova

doi:10.1016/j.scriptamat.2020.08.051

Origin of increased helium density inside bubbles in Ni_(1−x)Fe_x alloys

F. Granberg, X. Wang, D. Chen, K. Jin, Y. Wang, H. Bei, W. J. Weber, Y. Zhang, K. L. More, K. Nordlund, F. Djurabekova

Ken and Mary Alice Lindquist Department of Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni_(100−x)Fe_x-alloy samples compared to Ni. The bubbles in the Ni_(100−x)Fe_x-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.

Original language	English (US)
Pages (from-to)	1-6
Number of pages	6
Journal	Scripta Materialia
Volume	191
DOIs	https://doi.org/10.1016/j.scriptamat.2020.08.051
State	Published - Jan 15 2021

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2020.08.051

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title = "Origin of increased helium density inside bubbles in Ni(1−x)Fex alloys",

abstract = "Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni(100−x)Fex-alloy samples compared to Ni. The bubbles in the Ni(100−x)Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.",

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AU - Granberg, F.

AU - Wang, X.

AU - Chen, D.

AU - Jin, K.

AU - Wang, Y.

AU - Bei, H.

AU - Weber, W. J.

AU - Zhang, Y.

AU - More, K. L.

AU - Nordlund, K.

AU - Djurabekova, F.

PY - 2021/1/15

Y1 - 2021/1/15

N2 - Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni(100−x)Fex-alloy samples compared to Ni. The bubbles in the Ni(100−x)Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.

AB - Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni(100−x)Fex-alloy samples compared to Ni. The bubbles in the Ni(100−x)Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.

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Origin of increased helium density inside bubbles in Ni_(1−x)Fe_x alloys

Abstract

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