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

^*Corresponding author for this work

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

14 Citations (Scopus)

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
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
Publication status	Published - 15 Jan 2021
Externally published	Yes

Keywords

Electron energy loss spectroscopy (EELS)
He-bubbles
Molecular dynamics (MD)
NiFe-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.",

keywords = "Electron energy loss spectroscopy (EELS), He-bubbles, Molecular dynamics (MD), NiFe-alloys",

author = "F. Granberg and X. Wang and D. Chen and K. Jin and Y. Wang and H. Bei and Weber, {W. J.} and Y. Zhang and More, {K. L.} and K. Nordlund and F. Djurabekova",

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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.

KW - Electron energy loss spectroscopy (EELS)

KW - He-bubbles

KW - Molecular dynamics (MD)

KW - NiFe-alloys

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ER -

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

Abstract

Keywords

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