Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School IV - Plasma Wall Interaction
P 15.5: Vortrag
Mittwoch, 7. März 2018, 15:40–16:05, A 0.112
Characterization of CVD tungsten-fibre reinforced tungsten composite: From the bulk to the interface — •Hanns Gietl1,2, Johann Riesch1, Jan W. Coenen3, Till Höschen1, Leonard Raumann3, and Neu Rudolf1,2 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching — 2Technische Universität München, 85748 Garching — 3Forschungszentrum Jülich, IEK4, 52425 Jülich
For the use in a fusion device tungsten has unique properties such as low sputter yield, high melting point and low activation. However, the brittleness below the ductile-to-brittle transition temperature and the embrittlement during operation are the main drawbacks for the use of pure tungsten. Tungsten fibre-reinforced tungsten composites overcome this problem by utilizing extrinsic mechanisms to improve the materials* toughness. The next step in the material development is the conceptual proof for the applicability in fusion reactors by the production of larger components and for testing them under cyclic high heat flux loading. The characterization of the composites is one of the major issues to predict the material behavior within such a component. Different test methods for tungsten fibre-reinforced tungsten composites such as bending, charpy impact, and monotonic as well as cyclic tension tests were performed. The resulting fracture surfaces were examined by microstructural analysis to analyze the fracture mechanisms. In addition a single fibre pull-out test was developed to investigate the interface region between fibre and matrix which governs the overall material behavior.