Title :
Effect of heat treatment on TiAl alloy
Author :
Fallahi, Hojjatollah ; Abdullah, Johari ; Bt Zulkurnaini, Noor Hanisah
Author_Institution :
Sch. of Mech. Eng., Univ. Sains Malaysia, Nibong Tebal, Malaysia
Abstract :
This research was carried out to investigate different phases of titanium Gamma and also the effect of heat treatment on the evolution of phases in the alloy. The effect of soaking time in high temperature on constitution of different phases are discussed base on SEM, XRD and optical microscope. It was observed that exposure of titanium gamma to heat caused decomposition of the lamellar phase to duplex phases and interface of lamellar phase which encourages heterogeneous nucleation. With further aging, it caused grain growth, which is undesirable because of embrittlement phenomena. On the other hand, longer soaking time leads to removal of unstable β phases replaced by γ phase. Also effect of strain rate on the strength and ductility was been investigated. Fatigue test was also done on the titanium aluminium under different frequencies and the effect of different frequencies was investigated.
Keywords :
X-ray diffraction; aluminium alloys; dissociation; ductility; embrittlement; fatigue; fatigue testing; fracture mechanics; grain growth; heat treatment; high-temperature effects; nucleation; optical microscopy; scanning electron microscopy; solid-state phase transformations; titanium alloys; γ phase; SEM; TiAl; X-ray diffraction; XRD; ductility; embrittlement phenomena; fatigue testing; grain growth; heat treatment effect; heterogeneous nucleation; high-temperature effects; lamellar-duplex phase decomposition; lammelar phase interface; optical microscopy; phase evolution; scanning electron microscopy; soaking time effect; strain rate effect; titanium gamma-exposure phases; unstable β phase; Fatigue; Heat treatment; Intermetallic; Microstructure; Titanium; X-ray scattering; Fatigue and mechanical properties; Microstructure study; Titanium Aluminium;
Conference_Titel :
Space Science and Communication (IconSpace), 2013 IEEE International Conference on
Conference_Location :
Melaka
DOI :
10.1109/IconSpace.2013.6599497
