TiAl ALLOY, ITS MANUFACTURING METHOD, AND MOVING BLADE USING IT

摘要

PROBLEM TO BE SOLVED: To provide a TiAl alloy excellent in strength and toughness at room temperature, particularly in impact characteristics, its manufacturing method, and a moving blade using it. SOLUTION: The TiAl-base alloy has a fine structure in which lamellar grains of 1-50μm average grain size, whereα2-phase andγ-phase are alternately laminated, are densely arranged. The alloy has a composition represented by Ti-(42 to 48)Al-(5 to 10) (Cr and/or V) or Ti-(38 to 43)Al-(4 to 10)Mn. This alloy can be obtained by carrying out holding in the equilibrium temperature region ofα-phase or (α+β)-phase and high speed plastic working in the course of cooling.