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

0377745 - ÚFM 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
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]
Grant CEP: GA ČR(CZ) GAP107/11/0704
Výzkumný záměr: CEZ:AV0Z2041904; CEZ:AV0Z10480505
Institucionální podpora: RVO:68081723 ; RVO:61389005
Klíčová slova: graded cooling heat treatment * cast gama-TiAl alloy * microstructure * neutron diffraction * fatigue
Kód oboru RIV: JG - Hutnictví, kovové materiály

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.
Trvalý link: http://hdl.handle.net/11104/0215265