Development and application of advanced materials, cast gamma titanium aluminides and silicon carbide matrix composites, for improved performance aero-space engines

Advanced materials are very important to improve the performance of aircraf t engines. Superalloys and titanium alloys have been developed to raise the operating temperature and reduce the weight of engine components. However, engines in the 21st century will require advanced materials with higher he at-resistance, superior mechanical properties and reduced weight. Intermeta llic compounds and composites have been considered as alternate materials, replacing the existing Ni-based super-alloys. In particular, Gamma-TiAl and Ceramic Matrix Composite are expected to be revolutionary materials. In or der for both advanced materials, TiAl and CMC, to be widely employed in str uctural use, it is important to understand the effects of metallurgical fea tures on various properties. We have focused on the development of these ad vanced materials. In addition, with an industrial view to applications, pro blems are discussed through our experience in engine tests.