Microstructure Characterization and Faigue Behavior of Beta Phase Containing Gama-TiAl Alloy

0377745 - ÚFM 2013 RIV CZ eng C - Conference Paper (international conference)
Petrenec, Martin - Beran, Přemysl - Šmíd, Miroslav - Chlupová, Alice - Kuběnová, Monika
Microstructure Characterization and Faigue Behavior of Beta Phase Containing Gama-TiAl Alloy.
METAL 2012 Conference Proceedings. Ostrava: TANGER Ltd. Ostrava, 2012, s. 1-6. ISBN 978-80-87294-31-4.
[Metal 2012. Brno (CZ), 23.05.2012-25.05.2012]
R&D Projects: GA ČR(CZ) GAP107/11/0704
Institutional research plan: CEZ:AV0Z2041904; CEZ:AV0Z10480505
Institutional support: RVO:68081723 ; RVO:61389005
Keywords : graded cooling heat treatment * cast gama-TiAl alloy * microstructure * neutron diffraction * fatigue
Subject RIV: JG - Metallurgy

The microstructure and fatigue properties of Ti–44Al–7.8Nb – 0.2Ni (at.%) alloy after graded cooling heat treatment were investigated. Different techniques as SEM, TEM and FIB were used for characterization of microstructure. Quantification of phase volume fraction was measured by neutron diffraction method. After graded cooling heat treatment the structure consists of fully lamellar uniform grains which contain lamellar phases /2 and cubic  phases (ordered B2 and disordered  phases) at grain boundary and interlamellar spaces. The foils for TEM were prepared using FIB technique and observed in TEM in order to identify B2 phase by selected electron diffraction. Low cycle fatigue behaviour at 750 °C shows stable fatigue crack propagation due the presence of plastic beta and B2 phases.
Permanent Link: http://hdl.handle.net/11104/0215265