title: Special Grain Boundaries in Ultrafine-Grained Tungsten.
abstract: Field ion microscopy and computer simulation were used for the study of an atomic structure high-angle grain boundary in hard-drawn ultrafine-grained tungsten wire. These boundaries with special misorientations are beyond the scope of the coincident site lattice model. It was demonstrated that the special non-coincident grain boundaries are the plane-matching boundaries, and rigid-body displacements of adjacent nanograins are normal to the <110> misorientation axis. The vectors of rigid-body translations of grains are described by broad asymmetric statistical distribution. Mathematical modeling showed that special incommensurate boundaries with one grain oriented along the {211} plane have comparatively high cohesive energies. The grain-boundary dislocations ½<110> were revealed and studied at the line of local mismatch of {110} atomic planes of adjacent grains.
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine. dydo4kao@kipt.kharkov.ua.
authors.forename: O V
authors.initials: OV
authors.lastname: Dudka
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine.
authors.forename: V A
authors.initials: VA
authors.lastname: Ksenofontov
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine.
authors.forename: E V
authors.initials: EV
authors.lastname: Sadanov
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine.
authors.forename: I V
authors.initials: IV
authors.lastname: Starchenko
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine.
authors.forename: T I
authors.initials: TI
authors.lastname: Mazilova
authors.affiliation: Department of Condensed Matter, National Science Center "Kharkov Institute of Physics and Technology", Nat. Acad. of Sci. of Ukraine, Academicheskaja Str. 1, Kharkov, 61108, Ukraine.
authors.forename: I M
authors.initials: IM
authors.lastname: Mikhailovskij
keywords: Field ion microscope; Grain boundaries; Nanostructure; Tungsten