Influence of Heat Treatment on the Microstructure and Physicomechanical Properties of Titanium Alloys of the Ti−Nb−Mo system

We present the results of investigation of the structure and properties of four titanium alloys of the Ti–Nb–Mo system after their subsolidus annealing and annealing with quenching from 870°С. The obtained results indicate that heat treatment strongly affects the phase composition, microstructure, microhardness, Young’s modulus, and elastic properties of investigated specimens. The annealed alloys are two-phase α′ + β alloys and their Young’s modulus is close to Young’s modulus of pure titanium (87–100 GРа). Quenching leads to the formation of the α′′ -phase and the amount of β -phase becomes insignificant. As a result, the microhardness somewhat decreases and Young’s modulus becomes ∼ 1.5 times lower.