High-Strength Titanium Ti‐6Al‐2Sn‐2Zr‐2Mo‐2Cr Alloy Fasteners for Aerospace Applications

Next generation demanding aerospace structures requirements are pushing titanium alloy performance needs beyond the upper limits of the workhorse alloy Ti-6Al-4V (Ti-64), necessitating the use of advanced solutions. This presentation will provide an overview of Arconic’s engineered solution to address the needs of future aerospace fastening systems. Fastener usage of Ti-64 is restricted to applications requiring moderate tensile and shear strength combinations and smaller diameters (≤0.5”). Beta titanium alloys capable of achieving high strengths suffer from shortfalls in shear strength and producibility. There is a need for an affordable high strength titanium alloy that can extend titanium fastener usage to large diameters (up to 1”), reduce number of joints, and enable weight reductions by replacing heavy nickel/steel fasteners. Ti-6Al-2Sn-2Zr-2Cr-2Mo (Ti-62222) is a judiciously balanced alpha + beta titanium alloy which was designed and developed in the early 1970’s for aerospace applications that required higher strengths than Ti-64 in thick sections. The potential of Ti-6-2222 aerospace fasteners for achieving performance improvements and weight reductions will be illustrated in this paper.