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Comparison of K-doped and pure cold-rolled tungsten sheets: Tensile properties and brittle-to-ductile transition temperatures [in press]

Lied, Philipp; Pantleon, Wolfgang; Bonnekoh, Carsten; Bonk, Simon; Hoffmann, Andreas; Reiser, Jens; Rieth, Michael

Abstract:
For high-temperature environments, as in future fusion reactors, the use of tungsten materials has been sincerely discussed in the last decade. Although severe cold-rolling of tungsten leads to significant improvements in mechanical properties, the fine-grained microstructure of such tungsten material has to be stabilized. For that, the use of potassium-doping (K-doping) in tungsten sheets is investigated in our ongoing study. In this work, we compare mechanical properties of warm- and cold-rolled sheets of pure tungsten and K-doped tungsten (for five different degree of deformation respectively) by means of fracture toughness tests and tensile tests.

Fracture toughness and brittle-to-ductile transition temperatures (TBDT) are assessed, showing a slightly lower transition temperature for the cold-rolled K-doped sheets (lower than −100 °C for the 50 µm thick foil). The better performance of the K-doped sheet is related to its finer grain size. The thickest K-doped sheet shows a much higher TBDT than its pure tungsten counterpart. This is presumably caused by the presence of several tens of micrometre thick bands, containing only low angle boundaries, in the microstructure of the K-doped sheet.
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Originalveröffentlichung
DOI: 10.1016/j.jnucmat.2020.152664
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0022-3115, 1873-4820
KITopen-ID: 1000127693
HGF-Programm 31.03.09 (POF III, LK 01) Strukturmaterial f. Blanket und Divertor
Erschienen in Journal of nuclear materials
Verlag Elsevier
Seiten Art.-Nr.: 152664
Vorab online veröffentlicht am 13.11.2020
Schlagwörter Cold-rolling, Potassium-doping, Recrystallization inhibition, Fracture toughness, Tensile strength, Hall-Petch relation
Nachgewiesen in Scopus
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