Bubbles formation in helium ion irradiated Cu/W multilayer nanocomposites: effects on structure and mechanical properties
Bubbles formation in helium ion irradiated Cu/W multilayer nanocomposites: effects on structure and mechanical properties
This study investigates the effects of He bubbles on structural and mechanical properties of sputter-deposited Cu/W multilayers. A multilayer with a periodicity of 10 nm was deposited and subjected to helium ion irradiation with two different fluences. He bubbles formed mostly in Cu layers and their distribution was affected by He concentration and radiation damage. According to SRIM calculations, in low He concentration regions bubbles formed mostly along interfaces, while more homogeneously distributed bubbles were found in Cu layers and along columnar grain boundaries in higher He concentration regions. We suggest that the capability of interfaces to annihilate point defects is weakened by the He bubbles shielding effect. Nanoindentation tests revealed a hardness decrease amounting to ?0.5 and ?1 GPa for low and high fluences, respectively. The observed softening effect is attributed to He storage-induced changes in residual stresses and columnar grain boundary/interfacial sliding facilitated by He bubbles.
18-27
Callisti, Mauro
86e03724-aacc-46d5-bccc-4c7025556667
Karlik, M.
26f74a9e-c3e3-4f97-8f8d-32a8a6f288a2
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
May 2016
Callisti, Mauro
86e03724-aacc-46d5-bccc-4c7025556667
Karlik, M.
26f74a9e-c3e3-4f97-8f8d-32a8a6f288a2
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Callisti, Mauro, Karlik, M. and Polcar, Tomas
(2016)
Bubbles formation in helium ion irradiated Cu/W multilayer nanocomposites: effects on structure and mechanical properties.
Journal of Nuclear Materials, 473, .
(doi:10.1016/j.jnucmat.2016.02.006).
Abstract
This study investigates the effects of He bubbles on structural and mechanical properties of sputter-deposited Cu/W multilayers. A multilayer with a periodicity of 10 nm was deposited and subjected to helium ion irradiation with two different fluences. He bubbles formed mostly in Cu layers and their distribution was affected by He concentration and radiation damage. According to SRIM calculations, in low He concentration regions bubbles formed mostly along interfaces, while more homogeneously distributed bubbles were found in Cu layers and along columnar grain boundaries in higher He concentration regions. We suggest that the capability of interfaces to annihilate point defects is weakened by the He bubbles shielding effect. Nanoindentation tests revealed a hardness decrease amounting to ?0.5 and ?1 GPa for low and high fluences, respectively. The observed softening effect is attributed to He storage-induced changes in residual stresses and columnar grain boundary/interfacial sliding facilitated by He bubbles.
Text
Accepted Manuscript - Mauro Callisti.pdf
- Accepted Manuscript
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Accepted/In Press date: 15 February 2016
e-pub ahead of print date: 18 February 2016
Published date: May 2016
Organisations:
nCATS Group
Identifiers
Local EPrints ID: 393203
URI: http://eprints.soton.ac.uk/id/eprint/393203
ISSN: 0022-3115
PURE UUID: a1e6c099-9d6d-4dc8-bf6b-b80de1588351
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Date deposited: 22 Apr 2016 09:04
Last modified: 15 Mar 2024 05:31
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Author:
Mauro Callisti
Author:
M. Karlik
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