Recent Developments in High-Strength Titanium Fasteners for Aerospace Applications

ATI has a long history of making titanium mill products, including bar, rod & wire.  ATI has supplied ATI 45Nb™ titanium for over twenty years for use in rivet fastener applications.  Recently, ATI has begun producing small diameter titanium products (≤ 0.5 inch), including ATI 6-4™ and ATI 425® Alloy, as a qualified supplier for fastener stock applications.  ATI 425® Alloy has the potential to replace A286 for smaller diameters and Ti-6Al-4V in larger diameters due to its higher tensile and double shear properties. Furthermore, in lower temperature regimes, alloys such as ATI 425® Alloy have the potential to meet the higher tensile and double shear values required for fasteners previously reserved for heavier Ni-based alloys.  This presentation will describe typical properties for fastener stock made from both ATI 6-4™ Alloy and ATI 425® Alloy in both annealed and solution treated and aged conditions.  Recent work showing that ATI 425® Alloy can to exceed 200 ksi in ultimate tensile strength will be presented.