Helium-induced swelling and mechanical property degradation in ultrafine-grained W and W-Cu nanocomposites for fusion applications

Michael Wurmshuber, Mehdi Balooch, Xi Huang, Peter Hosemann, Daniel Kiener

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

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Besides high dose radiation and extreme thermal loads, a major concern for materials deployed in novel nuclear fusion reactors is the formation and growth of helium bubbles. This work investigates the swelling and mechanical property degradation after helium implantation of ultrafine-grained W and nanocrystalline W-Cu, possible candidates for divertor and heat-sink materials in fusion reactors, respectively. It is found that ultrafine-grained W and single crystalline W experience similar volumetric swelling after helium implantation but show different blistering behavior. The W-Cu nanocomposite, however, shows a reduced swelling compared to a coarse-grained composite due to the effective annihilation of radiation-induced vacancies through interfaces. Furthermore, the helium-filled cavity structures lead to considerable softening of the composite.
FachzeitschriftScripta materialia
Frühes Online-Datum2 März 2022
PublikationsstatusVeröffentlicht - Mai 2022

Bibliographische Notiz

Funding Information:
The authors acknowledge funding by the European Research Council under Grant No. 771146 (TOUGHIT). Additional financial support was provided by the Austrian Marshall Plan Foundation. The authors acknowledge further support from NSF DMR Award No. 1807822. The authors thank Dr. Michael Burtscher for providing TEM images of the W-Cu nanocomposite and Simon Doppermann for help with sample fabrication.

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