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Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 45: Topical Session (Symposium MM): Fundamentals of Fracture

MM 45.2: Talk

Wednesday, March 14, 2018, 17:30–17:45, TC 006

Combined experimental and theoretical study of Fe2AlTi/Fe-Al superalloys — •Martin Friák1,2, Ivana Miháliková1,2, Anton Slávik1,2, Vojtěch Homola2, Vilma Buršíková2, Naděžda Pizúrová1, Petr Dymáček1, Ferdinand Dobeš1, David Holec3, Yvonna Jirásková1, and Mojmír Šob4,1,51Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic — 2Faculty of Science, Masaryk University, Brno, Czech Republic — 3Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria — 4Central European Institute of Technology, CEITEC MU, Masaryk University, Brno, Czech Republic — 5Department of Chemistry, Faculty of Science, Masaryk University, Brno, Czech Republic

Fe-Al-based superalloys containing sub-micron Fe2AlTi cuboids coherently embedded into a disordered Fe-Al solid solution are intensively studied as materials for high-temperature applications. We focused on the Fe71Al22Ti7 alloy composition for which the transmission electron microscopy (TEM) revealed the superalloy nano-structure and the energy-dispersive X-ray (EDX) technique detected the composition of individual phases. Subsequent quantum-mechanical calculations predicted these two phases to be elastically very different. The differences in the elastic response were detected also experimentally by room-temperature quasistatic nano-/micro-indentation and nano-scale dynamic mechanical analysis (nanoDMA). Regarding high-temperature macro-scale measurements, small-punch testing was performed and the data were analyzed using a rheological model.

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