Aging characteristics of Ti-B20 alloy

The aging microstructures and properties of Ti-B20 alloy, a new high strength metastable beta titanium alloy which was designed according to the principle of ' critical molybdenum equivalence and multi-components strengthening', were investigated under different heat treatment conditions. The results show that compared to traditional metastable β titanium alloys, Ti-B20 alloy has more rapid aging response, much higher aging strengthening effect and much finer but homogeneous depositions. After α-β solution and 500-600°C aging treatment, excellent strength and plasticity properties can be achieved (ultimate tensile strength: 1200-1500 MPa; elongation; 8%-18%) and no precipitate-free regions have been found during high temperature aging treatment. Beside, the aging strength of alloy after solution treatment in β region is considerably higher than that in α-β region. But β solution and aging treatment will lead to remarkable decrease of tensile ductility. All these aging characteristics of T1-B20 alloy are responsible for its specific components.