SiC fibre-reinforced titanium aluminide (TiAl and Ti3Al) matrix composites have high melting points, high specific strengths and excellent creep resistance [1-7], and are candidates for high-temperature applications. However, further improvements of mechanical properties and reliability are needed as well as the development of coatings for protection from oxidation. For many applications, control of the interface is needed for the following reasons:

1. As the fibre and matrix are assembled in thermodynamically nonequilibrium states, a chemical reaction takes place at the interface between the fibre and matrix during fabrication and during service at high temperatures [8-12]. Such an interfacial reaction degrades the mechanical properties of the composite [13-17].