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Comparison of K-doped and pure cold-rolled tungsten sheets: As-rolled condition and recrystallization behaviour after isochronal annealing at different temperatures

Lied, P. ORCID iD icon 1; Bonnekoh, C. 1; Pantleon, W.; Stricker, M. 2; Hoffmann, A.; Reiser, J. 1
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS), Karlsruher Institut für Technologie (KIT)


Severely deformed cold-rolled tungsten is a promising structural material for future fusion reactor applications due to high melting temperature and excellent mechanical properties. However, the fine-grained microstructure after deformation is not stable at temperatures above 800 °C, leading to brittle material behaviour.
In this study, we utilize potassium-doping to inhibit recrystallization of tungsten sheets, a mechanism well known from incandescent lamp wires. We produced K-doped tungsten sheets by warm-rolling and subsequent cold-rolling with five different logarithmic strains up to 4.6, and equivalently rolled pure tungsten sheets. Both sets of materials are compared using EBSD and microhardness testing.
In both materials, the hardness increases and the grain size along normal direction decreases with strain; the densities of low and high angle boundaries increase in particular during cold-rolling. The K-doped W sheet reaches the highest hardness with 772 ± 8 HV0.1, compared to the pure W sheet with 711 ± 14 HV0.1. All boundaries taken into account, a Hall-Petch relation describes the hardness evolution nicely, except a deviation of the K-doped tungsten sheet rolled to highest strain with its much higher hardness.
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Postprint §
DOI: 10.5445/IR/1000098090
Veröffentlicht am 03.01.2022
DOI: 10.1016/j.ijrmhm.2019.105047
Zitationen: 28
Web of Science
Zitationen: 27
Zitationen: 27
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0263-4368, 0958-0611, 2213-3917
KITopen-ID: 1000098090
HGF-Programm 34.13.01 (POF III, LK 01) Material f.therm.,mechan.u.Umweltbelast.
Erschienen in International journal of refractory metals & hard materials
Verlag Elsevier
Band 85
Seiten 105047
Nachgewiesen in Scopus
Web of Science
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