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Coupling high-resolution characterization and phase-field microelasticity modeling, the non-conventional transformation pathway, mediated by ω precipitates, that leads to super-refined intragranular α precipitates in a metastable β Ti-alloy (Ti–5Al–5Mo–5V–3Cr, all in wt%) has been rationalized for the first time. Samples are initially solution treated above the β transus, rapidly cooled to room temperature, and then slowly heated (in the range 20°C–1 °C/min) to 600 °C. Interrupted tests, coupled with characterization involving scanning electron microscopy (SEM), transmission electron microscopy (TEM), high angle annular dark field-high resolution scanning transmission electron microscopy (HAADF-HRSTEM) and atom probe tomography (APT), have revealed the role of the ω phase on the copious nucleation of α leading to super-refined precipitation. Thus, both stress and compositional variations associated with …