Nucleation of dislocations and twins in fcc nanocrystals: Dynamics of structural transformations

Aleksandr V. Korchuganov, Aleksandr N. Tyumentsev, Konstantin P. Zolnikov, Igor Yu Litovchenko, Dmitrij S. Kryzhevich, Elazar Gutmanas, Shouxin Li, Zhongguang Wang, Sergey G. Psakhie

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    17 Citations (Scopus)

    Abstract

    This paper reports on a molecular dynamics study of structural rearrangements in a copper nanocrystal during nucleation of plastic deformation under uniaxial tension. The study shows that the resulting nucleation of partial dislocations on the free surface and their glide occurs through local fcc→bcc→hcp transformations via consistent atomic displacements. We propose an atomic model for the generation of dislocations and twins based on local reversible fcc→bcc→fcc transformations, with the reverse one proceeding through an alternative system. The model gives an insight into possible causes and mechanisms of the generation of partial dislocations and mechanical twins in two and more adjacent planes of plastically deformed nanocrystals. The obtained data allow a better understanding of how plasticity is generated in nanostructured materials.

    Original languageEnglish
    Pages (from-to)201-206
    Number of pages6
    JournalJournal of Materials Science and Technology
    Volume35
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2019

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    Keywords

    • Atomic model
    • Dislocation
    • Lattice defects
    • Molecular dynamics simulations
    • Nanotwin

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Mechanics of Materials
    • Mechanical Engineering
    • Polymers and Plastics
    • Metals and Alloys
    • Materials Chemistry

    Cite this

    Korchuganov, A. V., Tyumentsev, A. N., Zolnikov, K. P., Litovchenko, I. Y., Kryzhevich, D. S., Gutmanas, E., Li, S., Wang, Z., & Psakhie, S. G. (2019). Nucleation of dislocations and twins in fcc nanocrystals: Dynamics of structural transformations. Journal of Materials Science and Technology, 35(1), 201-206. https://doi.org/10.1016/j.jmst.2018.09.025