Evolution of microstructure, phase composition, and tensile properties of severely cold deformed titanium metastable β alloy in rapid continuous heating
(G. V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine,
36, Vernadsky Blvd., 03142, Kiev, Ukraine)
36, Vernadsky Blvd., 03142, Kiev, Ukraine)
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