Weakening aging-induced embrittlement via deformation-assisted regulation of isothermal ω precipitation in metastable Ti−15Mo alloy

• Pre-deformation before aging induces {332} twins and secondary α′′ phase, which regulate isothermal ω precipitation and suppress embrittlement. • Aging at 350 °C after pre-deformation yields a strength of 931 MPa with ~20% ductility, overcoming the trade-off between strength and ductility. • Aging at higher temperatures (400/450 °C) leads to complete collapse of ω phase, causing severe ductility loss. • Atomic-scale analysis reveals that partial collapse of ω phase is key to eliminating aging-induced embrittlement.