Abstract:Influence of severe cold deformation of titanium alloy Ti-1.5%Al-6.8%Mo-4.5%Fe in metastable β condition on the evolution of phase composition, microstructure, and tensile properties during continuous rapid heating was studied. As-deformed alloy was characterized by quasi-amorphous single-phase β condition with an abnormal temperature dependence of electric resistance that was normalized after 48 h exposure at room temperature as a result of isothermal ω phase precipitation. Subsequent rapid heating with a rate of 5 °C/s caused recovery and recrystallization. Tensile properties of the alloy after different treatments were determined and discussed.

Key words: titanium alloy; severe cold deformation; rapid heating; recovery and recrystallization; phase composition; microstructure; mechanical properties