Microstructural modulation of Ti–Fe–V ultrafine eutectic alloys with enhanced mechanical properties

Systematic microstructural investigation on a series of (Ti70.5Fe29.5)100−xVx alloys with x = 0, 1, 3, 5 and 7 reveals that addition of V content causes microstructural refinement and formation of ω-phase. By adding small amount of V (1–3 at.%) into the Ti70.5Fe29.5 binary eutectic alloy, both the strength and the plasticity of the alloys are spontaneously improved up to 2000–2200 MPa and ∼3.5%, respectively. However, large amount of V (5–7 at.%) leading to the high volume fraction of the ω-phase results in degradation in both strength and plasticity. These results suggest that the mechanical properties of the Ti–Fe–V ultrafine eutectic alloys are strongly governed by volume fraction of the eutectic matrix and ω-phases.