Observation of the intergrain hexagonal $\omega$ structure in tungsten

The structure of the Σ3⟨;110⟩{111} incoherent twin boundary in tungsten has been simulated by the molecular statistics methods using a multiparticle potential. The coalescence of {111} with the formation of the intergrain hexagonal close-packed phase has been observed. The observations of the atomic structure by the field ion microscopy corroborate computer simulation data. The description of the incoherent twin boundary as an ω-phase layer corresponds to the revealed features of the atomic structure of the boundary core.