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The brittle-to-ductile transition in cold-rolled tungsten sheets: Contributions of grain and subgrain boundaries to the enhanced ductility after pre-deformation

Bonnekoh, Carsten; Lied, Philipp; Zaefferer, Stefan; Jäntsch, Ute; Hoffmann, Andreas; Reiser, Jens; Rieth, Michael

Abstract (englisch):
One of the key demands on tungsten (W) as designated plasma-facing material (PFM) is the capability to fulfill a structural function. Since W has refused ductilization strategies by alloying alone, the production of W materials with enhanced ductility has come into focus considering tailored microstructures. This work addresses the rolling-induced microstructural modifications of warm- and cold-deformed W sheets and is supplemented by a comprehensive fracture mechanical study as a fundament for correlations between the spatial distribution of boundaries and brittle-to-ductile transition (BDT) temperature. Here we show that an extended Hall–Petch-like relationship is well suited to describe the rolling-induced reduction in BDT temperature and moreover has the potential to reflect the anisotropic nature of the transition temperature in severely rolled W sheets. Using the data of warm- and cold-rolled W sheets and also of strongly recovered W, best description of the BDT temperature was achieved by using as microstructural variables (i) the mean spacing between boundaries which intersect with the crack front and (ii) the mean boundary spacing along the normal of the crack plane. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125684
Veröffentlicht am 04.11.2020
Originalveröffentlichung
DOI: 10.1016/j.nme.2020.100769
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 28.10.2020
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000125684
HGF-Programm 31.03.09 (POF III, LK 01) Strukturmaterial f. Blanket und Divertor
Erschienen in Nuclear materials and energy
Band 25
Seiten 100769
Bemerkung zur Veröffentlichung Part of special issue: Selected papers from the 19th International Conference on Fusion Reactor Materials
Vorab online veröffentlicht am 18.07.2020
Nachgewiesen in Scopus
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