SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.28: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Structure-property relations for thin drawn tungsten wires — •Maximilian Fuhr1,2, Bailey Curzadd1,2, Batuhan Sancak1,2, Till Höschen1,2, Martin Balden1, Wolfgang Pantleon3, Jürgen Almanstötter4, Johann Riesch1, and Rudolf Neu1,2 — 1Max-Planck-Insitut für Plasmaphysik, Garching, Deutschland — 2Technische Universität München, Garching, Deutschland — 3Technical University of Denmark, Lyngby, Dänemark — 4OSRAM GmbH, Schwabmünchen, Deutschland
Tungsten (W) shows a ductile-to-brittle transition and fractures brittle below, but ductile above a certain transition temperature. This transition temperature, which is far above room temperature for coarse-grained W, can be shifted towards lower temperatures by wire drawing or other working processes. Wires drawn to very small diameters can deform ductilely at room temperature. The correlation between plastic deformation and the shift of the transition temperature is not fully understood, but the microstructure is thought to play a crucial role. In order to gain further insight into the open question of the enhanced ductility of worked tungsten, we investigated the mechanical properties (via uniaxial tensile testing) and microstructure (by EBSD) of four chemically identical wires drawn to diameters between 16 µm and 490 µm. Thorough quantitative analysis reveals the strong influence of the particular microstructure of the wires consisting of highly elongated grains with strong {110} fiber texture on their mechanical behavior and allow for formulating structure-property relations.