Original title: Microstructure Characterization and Faigue Behavior of Beta Phase Containing Gama-TiAl Alloy
Authors: Petrenec, Martin ; Beran, Přemysl ; Šmíd, Miroslav ; Chlupová, Alice ; Kuběnová, Monika
Document type: Papers
Conference/Event: Metal 2012, Brno (CZ), 2012-05-23 / 2012-05-25
Year: 2012
Language: eng
Abstract: 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.
Keywords: cast gama-TiAl alloy; fatigue; graded cooling heat treatment; microstructure; neutron diffraction
Project no.: CEZ:AV0Z2041904 (CEP), CEZ:AV0Z10480505 (CEP), GAP107/11/0704 (CEP)
Funding provider: GA ČR
Host item entry: METAL 2012 Conference Proceedings, ISBN 978-80-87294-31-4

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0215265

Permalink: http://www.nusl.cz/ntk/nusl-135419


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