Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C

0434484 - ÚFM 2015 RIV NL eng C - Conference Paper (international conference)
Chlupová, Alice - Obrtlík, Karel - Beran, Přemysl - Heczko, Milan - Polák, Jaroslav - Kruml, Tomáš
Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C.
XVII International Colloquium on Mechanical Fatigue of Metals (ICMFM17). Amsterdam: Elsevier, 2014 - (Gulagliano, M.; Vergani, L.), s. 405-408. Procedia Engineering, 74. ISSN 1877-7058.
[ICMFM 2014 International Colloquium on Mechanical Fatigue of Metals /17./. Verbania (IT), 25.06.2014-27.06.2014]
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068; GA ČR(CZ) GAP107/11/0704
Institutional support: RVO:68081723 ; RVO:61389005
Keywords : TiAl alloys * microstructure * neutron diffraction * fatigue
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Six grades of TiAl alloys doped with 7 at.% Nb and variable content of C and/or Mo were studied. The as-received microstructure and phase composition of the alloys was characterized using neutron diffraction experiments and electron microscopy. They are substantially different in individual alloys. In Mo containing alloys, ordered 0 phase is present while carbon suppresses the occurrence of this phase. Alternating lamellae of  and 2 phases are characteristic for all specimens. The specimens have been subjected to monotonic testing (tensile and compression) and to low cycle fatigue testing at ambient and at elevated temperatures. The differences in microstructure result in scatter of mechanical behaviour of the alloys, e.g. the yield stress at 750°C varies from 445 to 626 MPa. The mechanical properties of the materials are discussed in relation to the initial microstructure and phase composition.
Permanent Link: http://hdl.handle.net/11104/0238580