TiAl alloy includes 46 to 50 at % of Al, 5 at % or less of combination of Mo,
V and Si, provided that Si content is 0.7 at % or less, and Mo content satisfies
an equation of -;0.3x +17.5 at % or less where x represents Al (at %), and the
remainder being Ti and inevitable impurities. Mo may be replaced by Fe or combination
of Mo and Fe. TiAl alloy is heated to a melt, poured into a mold, and cooled at
a rate of 150 to 250 C./min within a temperature range of 1500 to 1100
C. The resulting product can be used as cast. If desired, however, heat treatment
such as HIP or homogenization may be performed within a temperature range of 1100
to 800 C. After the heat treatment, the melt is cooled at a rate of 100
C./min or more until room temperature.
