| 摘要 |
PURPOSE:To improve the cold ductility of the title alloy without impairing the excellent high temp. strength of TiAl by specifying the compsn. of Ti and Al into two-phase structure and incorporating specific amounts of Nb, etc., thereto. CONSTITUTION:The lightweight heat-resisting alloy contains, by weight, 30-36% Al and one kind among 0.5-15% Nb, 0.1-4% Cr and 0.1-6% Mo, contains, at need, one or more kinds among 0.01-0.5% B, C and Si and the balance Ti. Or, the alloy is constituted of the above Al, B, etc., and 0.1-8% V and the balance consisting of Ti. In the alloy, (TiAl+Ti3Al) consisting essentially of TiAl is regulated to its base and to which stabilizing elements such as Nb are added to facilitate the generation of twins. In the alloy, at the time of <=30% Al content, the volume of Ti3Al is made too large to lower high temp. strength and cold ductility. As for Nb, Cr, Mo or V, the addition of the lower limit or the above is required to improve its cold ductility; in the case of the upper limit or the above, normal ductility is lowered as for the Cr content, and high temp. strength is lowered as for the other elements. |
