The University of Southampton
University of Southampton Institutional Repository

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
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.
0022-3115
18-27
Callisti, Mauro
c752bde7-436d-4c04-8033-3255cb289777
Karlik, M.
26f74a9e-c3e3-4f97-8f8d-32a8a6f288a2
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Callisti, Mauro
c752bde7-436d-4c04-8033-3255cb289777
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, 18-27. (doi:10.1016/j.jnucmat.2016.02.006).

Record type: Article

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
Download (1MB)

More information

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
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 22 Apr 2016 09:04
Last modified: 17 Dec 2019 06:51

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×