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  Non-uniform He bubble formation in W/W2C composite: Experimental and ab-initio study

Šestan, A., Sreekala, L., Markelj, S., Kelemen, M., Zavašnik, J., Liebscher, C., et al. (2022). Non-uniform He bubble formation in W/W2C composite: Experimental and ab-initio study. Acta Materialia, 226: 117608. doi:10.1016/j.actamat.2021.117608.

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Šestan, Andreja1, 2, Autor           
Sreekala, Lekshmi3, Autor           
Markelj, Sabina4, Autor
Kelemen, Mitja4, Autor
Zavašnik, Janez5, 6, Autor           
Liebscher, Christian7, Autor           
Dehm, Gerhard1, Autor           
Hickel, Tilmann3, 8, Autor           
Čeh, Miran S.4, 9, Autor           
Novak, Saša10, 11, Autor           
Jenuš, Petra4, Autor           
Affiliations:
1Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
2Centre for Electron Microscopy and Microanalysis, Jožef Stefan Institute, Ljubljana, Slovenia, ou_persistent22              
3Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              
4Department for Nanostructured Materials, Jožef Stefan Institute, Ljubljana, Slovenia, ou_persistent22              
5Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
6Centre for Electron Microscopy and Microanalysis, Jožef Stefan Institute, Jamova cesta 39, Ljubljana, Slovenia, ou_persistent22              
7Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863399              
8Federal Institute for Materials Research and Testing (BAM), Richard-Willstätter-Straße 11, 12489, Berlin, Germany, ou_persistent22              
9Jožef Stefan International Postgraduate School, Ljubljana, Slovenia, ou_persistent22              
10Department for Nanostructured Materials, Jožef Stefan Institute, 1000, Ljubljana, Slovenia, ou_persistent22              
11Jožef Stefan International Postgraduate School, Jamova c. 39, 1000, Ljubljana, Slovenia, ou_persistent22              

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Schlagwörter: tungsten, ditungsten carbide, FAST, helium implantation, density functional theory
 Zusammenfassung: Tungsten-tungsten carbide (W/W2C) composites are considered as possible structural materials for future nuclear fusion reactors. Here, we report on the effect of helium (He) implantation on microstructure evolution of polycrystalline W/W2C composite consolidated by field-assisted sintering technique (FAST), homogenously implanted at room temperature with 1 MeV 4He+ ions at the fluence of 8 × 1016 ions cm−2 and annealed at 1873 K for 20 minutes. Samples were analysed by scanning and transmission electron microscopy to study the presence and size of He bubbles. Monomodal He bubbles in W (30-80 nm) are limited to point defects and grain boundaries, with a considerable void denuded zone (150 nm). Bubbles do not form in W2C, but at the W|W2C interface and are considerably larger (200-400 nm). The experimental observations on He behaviour and migration in W and W2C were assessed by density functional theory (DFT) calculations, suggesting He migration and accumulation in the composite are determined by the effective He-He binding in clusters, which will give rise to decohesion. In the presence of He clusters, the decohesion of bulk W into free surfaces is energetically highly favourable but not sufficient in the W2C; hence bubbles are only observed in W grains and interfaces and not within bulk W2C.

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Sprache(n): eng - English
 Datum: 2022-03
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/j.actamat.2021.117608
 Art des Abschluß: -

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Titel: Acta Materialia
  Kurztitel : Acta Mater.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Kidlington : Elsevier Science
Seiten: - Band / Heft: 226 Artikelnummer: 117608 Start- / Endseite: - Identifikator: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100