Effect of alloying and thermal processing on mechanical properties of tial alloys

0480159 - ÚFM 2018 RIV CH eng C - Conference Paper (international conference)
Chlupová, Alice - Heczko, Milan - Obrtlík, Karel - Beran, Přemysl - Kruml, Tomáš
Effect of alloying and thermal processing on mechanical properties of tial alloys.
Materials Structure & Micromechanics of Fracture VIII. Zürrich: Trans Tech Publications, 2017 - (Šandera, P.), s. 501-505. Solid State Phenomena, 258. ISBN 978-3-03835-626-4. ISSN 1662-9779.
[MSMF8. International Conference on Materials Structure and Micromechanics of Fracture /8./. Brno (CZ), 27.06.2016-29.06.2016]
R&D Projects: GA ČR(CZ) GAP107/11/0704
Institutional support: RVO:68081723 ; RVO:61389005
Keywords : Fatigue * Heat treatment * Lamellar microstructure * Mechanical properties * TiAl alloys
OECD category: Audio engineering, reliability analysis; Audio engineering, reliability analysis (UJF-V); Audio engineering, reliability analysis (UFM-A)

Two -based TiAl alloys with 7 at.% of Nb, alloyed with 2 at.% Mo and 0.5 at.% C, were studied. A heat treatment leading to very fine lamellar microstructure was applied on both alloys. Microstructure after the heat treatment was described and mechanical properties including fatigue behaviour were measured. The as-received material alloyed with C possesses high strength and very limited ductility, especially at RT. After application of selected heat treatment it becomes even more brittle, therefore, this process could be considered as not appropriate for this alloy. On the contrary, in the case of Mo alloyed material, both strength and ductility are improved by the heat treatment at RT and usual working temperature (~750 °C). Presence of the phase is responsible for this effect. The selected heat treatment thus can be an alternative for this alloy to other thermomechanical treatments as high temperature forging.
Permanent Link: http://hdl.handle.net/11104/0276855