Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 10: Poster Session 2
P 10.25: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Investigating the deformation of drawn tungsten wires — •Maximilian Fuhr1,2, Bailey Curzadd1,2, Johann Riesch1, Martin Balden1, and Rudolf Neu1,2 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching bei München — 2Technische Universität München, Boltzmannstraße 15, 85748 Garching bei München
Drawn tungsten wires are used as reinforcement fibres in tungsten fibre-reinforced tungsten composites (Wf/W). These composites mitigate the embrittlement issue of tungsten materials used in nuclear fusion technology by utilising extrinsic toughening mechanisms.
Tungsten wires show both a high strength and ductility when deformed in a room temperature tensile test. After reaching the maximum stress, the stress-strain curve exhibits a plateau that is followed up by a sharp stress drop. Contradicting the current theories, the localisation of plastic deformation to a specific specimen region (necking) is clearly visible only after the stress drop has occurred. Several different deformation mechanisms have so far been discussed to explain this behaviour of tungsten wires.
Thus, the tensile stress-strain behaviour of drawn tungsten wires is investigated using interrupted tensile tests at room temperature. The microstructure of the deformed specimens is studied using SEM and EBSD techniques. Special focus is thereby directed to the characteristic grain structure consisting of highly elongated grains and the strong fibre texture.