Alloys based on titanium aluminides, such as γ (TiAl) may be
made through the use of casting or powder metallurgical
processes and heat treatments. The alloys contain titanium, 38
to 46 atom % aluminum, 5 to 10 atom % niobium, with small
amounts of Cr, Si and Ni added according to required properties.
Titanium aluminide alloys are characterized by a low density, a
high rigidity and good corrosion resistance. In the fixed state,
they have domains with hexagonal (α), two-phase structures (α+β)
and cubically body-centered β phase and/or γ phase. TiAl alloy
is a new alloy based on intermetallic compounds and is
characterized by the properties of light weight and high
strength. As this alloy is suitable for rotating and
reciprocating parts, its applicability is related closely to
blades for airplanes and other industrial engines, and exhaust
valves and turbochargers for passenger vehicle engines. Two-
phase TiAl alloys have been receiving considerable attentions
because of their attractive properties, such as the l