Berlin 2018 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

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 Friák^1,2, Ivana Miháliková^1,2, Anton Slávik^1,2, Vojtěch Homola², Vilma Buršíková², Naděžda Pizúrová¹, Petr Dymáček¹, Ferdinand Dobeš¹, David Holec³, Yvonna Jirásková¹, and Mojmír Šob^4,1,5 — ¹Institute 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.