Patent ID: 6923934

Claim:
A casting method comprising the steps of: A) preparing a TiAl alloy having the following composition: Al: 46 to 50 at % Mo, V and Si: each individually being present and a total of these elements being greater than 0 and less than or equal to 5 at %, provided that Si content is greater than 0 and less than or equal to 0.7 at %, 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; B) heating the TiAl alloy to a melt; C) pouring the melt into a mold; and D) cooling the melt at a rate of 150 to 250° C./min within a temperature range of 1500 to 1100° C. to obtain an as-cast product.