Open AccessStrong rotated cube textures in thin cold-rolled potassium-doped tungsten sheets during annealing up to 1300 °C
Author(s) -
D. Tarras Madsen,
Umberto Maria Ciucani,
Andreas Hoffmann,
Wolfgang Pantleon
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1121/1/012018
Subject(s) - tungsten , annealing (glass) , materials science , volume fraction , electron backscatter diffraction , doping , cube (algebra) , diffraction , potassium , metallurgy , analytical chemistry (journal) , crystallography , composite material , microstructure , optics , geometry , chemistry , optoelectronics , mathematics , physics , chromatography
Due to the high operation temperatures, microstructural changes will occur in tungsten when used as plasma-facing material in future fusion reactors. In drawn tungsten wires, potassium doping has proven to prevent such undesired changes effectively. This strategy has been adapted to thin cold-rolled tungsten sheets containing 80 ppm potassium. Their texture evolution during annealing is investigated using electron backscatter diffraction. In the as-rolled condition, a strong cube texture is present with a volume fraction of 67.0 % deviating maximal 15° from the rotated cube orientation. This texture intensifies strongly during isochronal annealing for 2 h at temperatures between 1000 °C and 1300 °C; the higher the temperature, the higher the rotated cube fraction. The volume fraction of 94.8 % obtained after 2 h at 1300 °C does not change significantly during further annealing. These are remarkably strong textures for a body-centered cubic metal compared e.g. to commonly reported high volume fractions of 30 % for Goss orientations in silicon steels. Reliable quantification of such strong texture components requires analysis of orientations individually.