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'Titanium aluminide', TiAl, is an intermetallic chemical compound.
It is lightweight oxidation and very heat resistant, however it suffers from its low ductility. The density of gamma titanium aluminide is about 4.5g/cm³.
Titanium aluminide has three major phases: gamma-TiAl, alpha2-Ti₃Al and TiAl₃. Among the three, the first two phases are with most interest. Both gamma-TiAl and alpha2 Ti₃Al have excellent mechamical properties at high temperature (over 700 degree celsius), which made them possible to replace traditional Ni based superalloy for jet engine turbine blades.

★ Titanium Aluminide Applications in the HighSpeed Civil Transport