SKM 2021 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 7: Topical Session Interface-Dominated Phenomena - Segregation and Embrittlement
MM 7.3: Vortrag
Mittwoch, 29. September 2021, 12:00–12:15, H8
How grain boundary doping affects the mechanical properties in ultra-fine grained tungsten and nanocrystalline tungsten composites — •Michael Wurmshuber1, Simon Doppermann1, Stefan Wurster2, Severin Jakob1, Markus Alfreider1, Klemens Schmuck1, Rishi Bodlos3, Lorenz Romaner1, Verena Maier-Kiener1, Helmut Clemens1, and Daniel Kiener1 — 1Department Materials Science, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria — 2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria — 3Materials Center Leoben GmbH, Roseggerstraße 12, 8700 Leoben, Austria
Brittle intercrystalline fracture due to weak grain boundaries is a major problem in both refractory metals as well as nanostructured metals. Naturally, it is therefore also the preferred failure mode in ultra-fine grained tungsten, which is a prime candidate for the divertor material in nuclear fusion. In this work, ultra-fine grained tungsten samples doped with various ab-initio informed elements are fabricated and characterized. A clear improvement of mechanical properties could be observed for samples doped with boron and hafnium. Furthermore, nanocrystalline W-Cu samples were fabricated and doped with the same elements. While boron and hafnium also have a positive effect on the mechanical properties in these samples, the addition of rhenium leads to an even more pronounced improvement, pushing the boundaries set by the strength-ductility paradigm.