2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 7: Energy Production, Environmental & Multiscale

Editors:Kongoli F
Publisher:Flogen Star OUTREACH
Publication Year:2014
Pages:528 pages
ISBN:978-1-987820-09-6
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Disclinations and pentagonal symmetry in micro- and nanocrystalline objects

    Alexey Romanov1; Anna Kolesnikova2; Leonid Dorogin3; Anatoly Vikarchuk4;
    1IOFFE PHYSICAL TECHN. INST., St Petersburg, Russian Federation; 2INSTITIUTE OF PROBLEMS OF MECHANICAL ENGINEERING, St. Petersburg, Russian Federation; 3INSTITUTE OF PHYSICS, UNIVERSITY OF TARTU, Tartu, Estonia; 4TOGLIATTI STATE UNIVERSITY, Togliatti, Russian Federation;
    Type of Paper: Invited
    Id Paper: 343
    Topic: 18

    Abstract:

    We report on experimental study and theoretical analysis of pentagonal (five-fold) symmetry in micro- and nanocrystalline objects: metallic particles and elongated rods. The observations of electrodeposited small particles with decahedral and icosahedral morphology and rods with pentagonal cross-section, are presented. Internal structure of pentagonal objects is explained as a result of multiple twinning in a material with FCC crystal structure and formation of disclination defects. Knowledge on the disclination content of pentagonal objects allows one the elaboration of qualitative and quantitative models for their structural evolution and stability. To build such models, elasticity of disclination in finite size bodies is discussed in full details. Various relaxation processes leading to the diminishing of the internal energy of disclinated particles and elongated rods are proposed. These processes include the emergence of a hole at dislocation core, generation of additional dislocation defects inside pentagonal objects, and formation of the crystal lattice-mismatch layer on the particle or rod surface. The operation of the listed relaxation mechanisms is documented by available experimental data.
    The content of the report is based mainly on the following publications:
    [1] V.G. Gryaznov, J. Heydenreich, A.M. Kaprelov, S.A. Nepijko, A.E. Romanov, J. Urban,Cryst. Res. Techn. 34 (1999) 1091.
    [2] A.E. Romanov, A.L. Kolesnikova, Progr. Mater. Sci. 54 (2009) 740.
    [3] L.M. Dorogin, S. Vlassov, A.L. Kolesnikova, I. Kink, R. Lohmus, A.E.Romanov, Phys. Stat. Sol. (b) 247 (2010) 288.
    [4] A.E. Romanov, A.A. Vikarchuk, A.L. Kolesnikova, L.M. Dorogin, I. Kink, E.C. Aifantis, J. Mater. Res. 27 (2012) 545.
    [5] A.E. Romanov, L.M. Dorogin, A.L. Kolesnikova, I. Kink, I.S. Yasnikov, A.A. Vikarchuk, Tech. Phys. Lett. 40 (2014) 174.

    Keywords:

    disclination, pentagonal particle

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    Cite this article as:

    Romanov A, Kolesnikova A, Dorogin L, Vikarchuk A. Disclinations and pentagonal symmetry in micro- and nanocrystalline objects. In: Kongoli F, editors. Sustainable Industrial Processing Summit SIPS 2014 Volume 7: Energy Production, Environmental & Multiscale. Volume 7. Montreal(Canada): FLOGEN Star Outreach. 2014. p. 493-494.