Strength and resource-saving titanium alloy member with excellent toughness and a method of manufacturing the same

摘要

[problem] resources than conventional titanium alloys using a rich and inexpensively available alloying elements, and, resource-saving titanium alloy than conventional alloys to achieve both high strength and high toughness with a small amount of additives the be provided at low cost. In A mass%, Al: 4.5% or more and less than 5.5%, Fe: less than 1.3% or more 2.3%, Si: less than 0.25% or more 0.50% , O: containing less than 0.05% to 0.25% and the balance titanium and unavoidable impurities, the microstructure is the average width of the acicular phase is characterized by a needle-like structure is less than 5 m strength and toughness to the excellent titanium alloy member.