Microstructure and tensile properties of a multi-alloyed α + β titanium alloy Ti4.5Al10.5V3Fe

Based on the thermodynamic database of the Ti–Al–Fe–V quaternary system, a novel α + β titanium alloy, Ti-4.5Al-10.5V–3Fe, with greater performance was developed by combining CALPHAD and Mo equivalent method. The microstructure shows that this alloy is composed of α and β phases in both rolled and heat treatment states, which is in line with the theoretical expectation. The tensile properties of this alloy were tested at room temperature, and the tensile strength (σb) and elongation (EI) achieved 1085.1 MPa and 15.5%, respectively. Compared with Ti-1023 alloy (Ti–10V–2Fe–3Al), the developed Ti-4.5Al-10.5V–3Fe alloy has better properties. The fracture morphology was analyzed and the results show that the alloy is plastic fracture. The Ti-4.5Al-10.5V–3Fe alloy shows promising potential application prospects although more research is needed to further understanding this alloy. These results also provide theoretical support for further development of titanium alloys containing Al, Fe and V.