Potential of high-Nb-TiAl alloys for aero-engine application

Intensive efforts in TiAl technology over recent years has promoted TiAl as having a high potential for entering the production phase in automotive and aero engines applications. The application spectrum investigated for TiAl ranges from high loaded components like compressor and turbine blades, casings and structural components to fabricated parts in the exhaust area. The introduction of TiAl into service is mainly determined by the two principal factors of alloy and process development to achieve competitive properties/quality with developed manufacturing technologies. Additionally a proper component selection is required in order to maximise the benefits of implementing the new technology. This paper is concentrated on the development and implementation of TiAl compressor blades for aero engines with the focus on the improved benefits associated with the development of the new high Nb containing TiAl alloy family. A property review together with critical manufacturing aspects associated with the new alloy family will be addressed. Additional requirements for successful implementation of the technology will also be discussed. (AU) © TMS (The Minerals, Metals & Materials Society), 2004