TiAl-Based Alloys and Their Applications

Dear Colleagues, 

Titanium aluminides represent a new important class of alloys providing very promising properties for high-temperature applications in aircraft, automotive, and power industries. TiAl-based alloys represent a unique group of lightweight heat-resistant materials characterized by low density, high specific strength at elevated temperature, good creep resistance up to about 700 °C, good corrosion resistance, excellent burn resistance, high elastic moduli in a wide temperature range, low diffusion coefficient, and high melting point. These properties predestinate the TiAl-based alloys to replace currently used heavy and expensive nickel-based superalloys (in the low pressure turbine part) and the conventional titanium alloys (in the compressor part of aerospace gas turbine engines). Although a great deal of effort has been made over the past two decades to introduce TiAl-based alloys into the market as engineering components, only a few market application in the aircraft and automotive industries have been established (e.g., low-pressure turbine blades in General Electric’s GEnx engine). Now, with the rapid development of the aviation industry, TiAl-based alloys must show greater strength and toughness. The wide application of TiAl-based alloys is still hindered by their difficult manufacturing and processing, high production cost, low ductility at room temperature, low fracture toughness and oxidation resistance at high temperature, low formability, and current lower operational temperature limit over 750 °C. Intermetallic TiAl-based alloys exhibit the highest potential for near-term application in future aircraft engines, but a great deal of research is still required on improving their chemical composition, alternative and lower-cost production processes, as well as on the optimization of mechanical and physical properties of new alloys intended for specific components.This Special Issue is dedicated to presenting the current status of knowledge on the correlation between microstructure and properties of TiAl-based alloys and composites produced in different advanced processing technologies.

Prof. Wojciech Szkliniarz
Prof. Agnieszka Szkliniarz
Guest Editors

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