Development of ATI 425® Alloy Fastener Stock

The assembly of modern aircraft relies heavily on fasteners. These fasteners are often composed of titanium alloys due to their corrosion-resistance, light weight, and mechanical performance. A new option to existing titanium fastener alloys is ATI 425® Alloy. This new fastener alloy meets and exceeds standard aerospace qualification criteria for titanium bars and wire in a solution-treated and aged condition. ATI 425® Alloy wires and bars can be produced in various sizes for aerospace fastener applications. Hot rolled ATI 425® Alloy wires generally have an average ultimate tensile strength above 195 ksi and an average double shear value above 115 ksi for sizes up to 0.531" diameter in a solution treated and aged condition. Mechanical testing, including tensile and double shear testing, and metallographic results from four final fastener stock sizes (0.188", 0.250", 0.406", and 0.531") in the as-drawn, mill annealed, and solution treated and aged conditions, will be discussed in this presentation. The performance and manufacturability of ATI 425® Alloy as fastener stock will also be highlighted.