A binary beta titanium superalloy containing ordered-beta TiFe, alpha and omega

Alpha-beta titanium alloys excel for aeroengine applications but are typically limited to ~550°C. An alternative strategy is reinforcement with the ordered-beta TiFe intermetallic, toward ‘β-Ti superalloys’, however, there has been minimal study of precipitation in binary system. Here, a Ti-20Fe (at.%) alloy was homogenised at 1050°C β-Ti phase field and aged 600°C where Fe supersaturation promoted precipitation. Curiously, as volume fraction increased, hardness decreased, due an interplay mechanisms: (1) solid solution strengthening, which reduces content falls 16.2% on ageing; (2) ω ω-like incommensurate modulated domains were identified by transmission electron microscopy parent suggested change size structure after ageing, resulting reduced ω-strengthening; (3) softening softer α-Ti phases precipitate from harder ω‑strengthened phase.