| 摘要 |
PROBLEM TO BE SOLVED: To provide a TiAl alloy which has superior high-temperature creep characteristics to a conventional one without impairing its toughness and lightweight properties. SOLUTION: The TiAl alloy has a composition comprising, by mass%, 31 to 34% Al, 0.1 to 0.7% Si, one or more elements of 0.1 to 15.0% Nb, 0.1 to 15.0% Mo, 0.1 to 15.0% W and 0.1 to 15.0% Ta so that the total amount can satisfy Nb+Mo+W+Ta≤15.0%, one or more elements of 0.1 to 3.0% Cr, 0.1 to 3.0% Mn and 0.1 to 3.0% V so that the total amount can satisfy Cr+Mn+V≤3.0%; 0.01 to 0.12% C and the balance Ti with unavoidable impurities, while satisfying the following expressions (1), (2) and (3): expression (1): value A (=0.15(Nb+Mo+W+Ta)+0.05(Cr+Mn+V)+0.95Si-5C)=0.8 to 3.0; expression (2): Al=(33.5-value A)±0.5; and expression (3): value B (=0.5Si+5C)=0.1 to 0.8. COPYRIGHT: (C)2008,JPO&INPIT
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