J. V. Mantione, T. D. Bayha, Allegheny Technologies Incorporated (ATI), Monroe, NC
Titanium alloy 5-5-5-3 (Ti-5Al-5V-5Mo-3Cr) is a near beta titanium alloy intended for fatigue and fracture toughness limited aircraft structural applications requiring superior tensile strength when compared to beta processed alpha/beta titanium alloys. Its ability to be forged into complex shapes and heat treated to above 180 ksi ultimate tensile strength makes it a promising titanium alloy material for landing gear applications over traditional Ti alloys such as Ti-10-2-3. Additionally, the inherent corrosion resistance of titanium alloys relative to steels reduces operation and sustainment costs for the airline industry. Reducing the bulk weight of the major structural components while simultaneously increasing system operating efficiency is currently a key challenge for the aircraft design community. The mechanical properties of alloy Ti-5-5-5-3 are developed by sub-transus solution heat treat or supra-transus beta anneal and appropriate ageing to control grain size and precipitation in the wrought microstructure. Based on a history of successfully casting highly alloyed titanium ingots with precise chemistry, ATI Allvac has leveraged extensive experience with Cold Hearth Plasma Melting for the production of Ti-5-5-5-3 ingot. An added benefit for flight critical hardware is the extremely low melt-related defect rate historically demonstrated by Cold Hearth Plasma Melted titanium ingots in jet engine rotating components.
Summary: Titanium alloy 5-5-5-3 (Ti-5Al-5V-5Mo-3Cr) is a near beta titanium alloy intended for fatigue and fracture toughness limited aircraft structural applications requiring superior tensile strength when compared to beta processed alpha/beta titanium alloys. Based on a history of successfully casting highly alloyed titanium ingots with precise chemistry, ATI Allvac has leveraged extensive experience with Cold Hearth Plasma Melting for the production of Ti-5-5-5-3 ingot. An added benefit for flight critical hardware is the extremely low melt-related defect rate historically demonstrated by Cold Hearth Plasma Melted titanium ingots in jet engine rotating components.
