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P: Fachverband Plasmaphysik

P 18: Helmholtz Graduate School HEPP IV

P 18.1: Talk

Thursday, March 31, 2022, 14:00–14:25, P-H12

Microstructure and deformation behaviour of drawn W wires — •Maximilian Fuhr^1,2, Nuttawan Ketkao^1,3, Till Höschen¹, Nico Hempel², Martin Balden¹, Wolfgang Pantleon⁴, Jürgen Almanstötter⁵, David Rafaja³, Johann Riesch¹, and Rudolf Neu^1,2 — ¹Max-Planck-Insitut für Plasmaphysik, Garching, Deutschland — ²Technische Universität München, Garching, Deutschland — ³TU Bergakademie Freiberg, Freiberg, Deutschland — ⁴Technical University of Denmark, Lyngby, Dänemark — ⁵OSRAM GmbH, Schwabmünchen, Deutschland

Tungsten (W) shows a pronounced transition from ductile deformation behaviour at high temperatures to brittle behaviour at low temperatures (ductile-to-brittle transition). Standard, coarse-grained W exhibits transition temperatures T_DBT around 300^∘ C, rendering it unsuitable for structural applications below T_DBT. The transition is shifted to lower temperatures by cold-working W in wire drawing, rolling or a severe plastic deformation process. Sufficiently cold-worked W materials deform plastically at room temperature and below. The reasons for the shift of T_DBT are connected to the deformation-induced microstructural changes. Thus, we performed the first systematic study focusing on the structure-property relations of a series of sequentially drawn potassium-doped W wires. The combination of careful microstructural investigations (electron backscatter diffraction (EBSD), X-ray diffraction (XRD)) and various mechanical tests performed at room and elevated temperatures allow for new insights into the deformation behaviour of drawn W wires.