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The $\alpha/\beta$ interface is central to the microstructure and mechanicalproperties of titanium alloys. We investigate the structure, thermodynamics andmigration of the coherent and semicoherent Ti $\alpha/\beta$ interfaces as afunction of temperature and misfit strain via molecular dynamics (MD)simulations, thermodynamic integration and an accurate, DFT-trained DeepPotential. The structure of an equilibrium semicoherent interface consists ofan array of steps, an array of misfit dislocations, and coherent terraces.Analysis determines the dislocation and step (disconnection) array structureand habit plane. The MD simulations show the detailed interface morphologydictated by intersecting disconnection arrays. The steps are shown tofacilitate $\alpha/\beta$ interface migration, while the misfit dislocationslead to interface drag; the drag mechanism is different depending on thedirection of interface migration. These results are used to predict the natureof $\alpha$ phase nucleation on cooling through the $\alpha$-$\beta$ phasetransition.

Coherent and semicoherent $\alpha$/$\beta$ interfaces in titanium: structure, thermodynamics, migration