Transformation Pathway upon heating of metastable β titanium alloy Ti-15Mo investigated by neutron diffraction

Abstract

transformation pathway during thermal treatment of metastable b Ti-15Mo alloy was investigated by in situ neutron diffraction. The evolution of individual phases α, β, and ω was investigated during linear heating with two heating rates of 1.9 °C/min and 5 °C/min and during aging at 450 °C. The results showed that with a sufficient heating rate (5 °C/min in this case), the ω phase dissolves before the a phase forms. On the other hand, for the slower heating rate of 1.9 °C/min, a small temperature interval of the coexistence of the α and ω phases was detected. Volume fractions and lattice parameters of all phases were also determined.