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

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http://hdl.handle.net/10138/321546

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Granberg , F , Wang , X , Chen , D , Jin , K , Wang , Y , Bei , H , Weber , W J , Zhang , Y , More , K L , Nordlund , K & Djurabekova , F 2021 , ' Origin of increased helium density inside bubbles in Ni(1-x)Fex alloys ' , Scripta Materialia , vol. 191 , pp. 1-6 . https://doi.org/10.1016/j.scriptamat.2020.08.051

Title: Origin of increased helium density inside bubbles in Ni(1-x)Fex alloys
Author: Granberg, F.; Wang, X.; Chen, D.; Jin, K.; Wang, Y.; Bei, H.; Weber, W. J.; Zhang, Y.; More, K. L.; Nordlund, K.; Djurabekova, F.
Contributor: University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2021-01-15
Number of pages: 6
Belongs to series: Scripta Materialia
ISSN: 1359-6462
URI: http://hdl.handle.net/10138/321546
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. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
Subject: He-bubbles
NiFe-alloys
Electron energy loss spectroscopy (EELS)
Molecular dynamics (MD)
VACANCY CLUSTERS
MECHANISMS
ACCUMULATION
IMPLANTATION
IRRADIATION
STABILITY
114 Physical sciences
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