Development of High Strength Alpha-Beta Titanium Alloy TIMETAL® 575

TIMETAL® 575 (Ti-575) is a newly developed alpha-beta titanium alloy by TIMET. The alloy provides higher strength than Ti-64 by more than 15% under equivalent heat treatment conditions. The composition of the alloy is essentially a Ti-Al-V system and its density is comparable to that of Ti-64. As a result of the aforementioned characteristics, Ti-575 shows higher specific strength (strength/density ratio) that is a primary advantage in aerospace applications. The alloy also exhibits superior high cycle and low cycle fatigue properties compared with Ti-64.  Ti-575 has excellent producibility in melting and conversion; the alloy does not contain segregation prone elements and displays superior ductility in hot working conditions. Production scale trials and evaluations are in progress. This paper will discuss the alloy design concept and various mechanical properties of Ti-575 as compared with Ti-64.