Orientation effect on α/β phase interface mediated deformation mechanism in titanium alloy

[Display omitted] •Phase interface in two-phase (α+β) titanium alloys was demonstrated as predominant dislocation nucleation site.•Deformation mechanism strongly depends on the orientation effect.•Four deformation mechanisms including prismatic , shear band, basal and pyramidal II dislocations are identified. Ti alloys with dual α and β phases are commonly used in various applications due to their superior mechanical properties. In the present work, to unravel the effect of orientation angle θ between the α and β phases, molecular dynamics simulations were performed on Ti alloy bicrystal samples with the orientation angle varied from 0° to 90°. Under compressive stress, the phase interface was observed to nucleate defects, leading to four distinct deformation mechanisms depending on the orientation angle. Prismatic dislocations were identified at orientation angles around 0°, while shear bands were observed in the range of 5°