In this study, the thermal analysis of the ω nanophase transformation from a quenched metastable β Ti–12Mo alloy composition
(mass%) was investigated by electrical resistivity and dilatometry measurements. The activation energy was observed to be
121 ± 20 kJ mol−1 (from resistivity measurements) and 114 ± 12 kJ mol−1 (from dilatometry measurements) during the early stage of the transformation process. The kinetic of the ω nanophase transformation
was modelized by using the classical Johnson–Mehl–Avrami (JMA) theory and a modified Avrami (MA) analysis. An Avrami exponent
close to 1.5 was found at the early stage of the transformation suggesting a pure growth mechanism from pre-existing nucleation
sites. Nevertheless, it was observed a decrease of the Avrami exponent to 0.5 at higher transformed fraction demonstrating
a dimension loss in the growth mechanism due to the existence of the high misfit strain at the interface β/ω.