ATI 425® Alloy Long Products Development

ATI 425^® Alloy, nominal composition Ti-4.0Al-2.5V-1.5Fe-0.25O, is a new alpha-beta (α/β) Ti alloy of significant commercial interest as a viable replacement for Ti-6Al-4V, CP-Ti, and other alloys in a variety of low- to moderate-strength aerospace applications.  ATI 425® Alloy offers Ti-6Al-4V alloy-like properties with significant improvements in formability.  The advantages in formability, combined with the depth and breadth of manufacturing capabilities within ATI, have led to some unique product and property combinations not accessible by conventional α/β Ti alloys.  This talk focuses on the development of ATI 425® Alloy long products.

 A major focus of the development effort was on hot-rolled bar and rod with AMS 4928 equivalent properties.  Subsequently, a design of experiments was employed for the optimization of STA heat treatments targeting AMS 4965 equivalent properties.  The improved formability of the alloy was tested during the development of hot-rolled shapes and cold-drawn bar.  Lastly, the smallest end of the size spectrum was explored in the development of hot-rolled and cold-drawn wire.  The culmination of the development efforts is a product family with a useful and unique set of properties amongst the α/β Ti alloys.