TIMETAL 230, a binary alloy containing 2.5% copper, combines the formability and weldability of unalloyed titanium with improved mechanical properties, particularly at elevated temperatures. The alloy can be used at temperatures up to 660°F (350°C), and is used in the annealed condition as sheet, forgings and extrusions for fabricating components such as bypass ducts of gas-turbine engines. Its use spread to the airframe industry, following the development of an ageing treatment which raises room-temperature tensile properties by about 25%, and nearly doubles the elevated temperature properties. Such a material is particularly attractive since it can be formed in the soft condition, thus lowering fabrication costs.