| 摘要 |
PROBLEM TO BE SOLVED: To provide a cast article of titanium aluminide, which has fine crystal grains in the metal structure and is superior in both creep property and fatigue characteristics, and provide a crystal-grain refining method therefor. SOLUTION: The objective cast article of titanium aluminide is comprised of a Ti-Al-Mo-V alloy having a chemical composition of 46-50 atom.% Al, 5 atom.% or less in the total of Mo, V, and Si, (where a Si content is 0.7 atom.% or less, and a Mo content is 17.5-0.3x atom.% or less (x represents an Al content)), 0.1-0.4 atoms.% C, and the balance Ti with unavoidable impurities.
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