PURPOSE:To improve the cold ductility of the Ti3Al-base alloy without deteriorating the characteristics of lightness in weight and high strength by dispersing a beta phase into an intermetallic compound Ti3Al in a specified ratio and incorporating specified small amounts of B, C, Si, etc., thereto. CONSTITUTION:The raw material of a V-Al series master alloy constituted of high purity sponge Ti, Al and 3 to 12wt.% V as the element for stabilizing a beta phase as well as TiB2, TiC, Si, etc, is melted in a vacuum arc melting furnace to refine an intermetallic compound Ti3Al in which 1 to 20vol.% betaphase is dispersed and contg. 0.001 to 0.4wt.% of one or more kinds among C, B, Si, etc. To Ti3Al which has the characteristics of lightness in weight and excellent high strength, but is inferior in cold ductility, V as a stabilizer for a beta phase is added and B, C, Si, etc., are incorporated to suppress the amt. of the beta phase to the minimum, by which low cold ductility which has been the defect of the alloy can highly be improved without deteriorating the characteristics of lightness in weight and high strength.
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