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

    Результат исследований: Материалы для журналаСтатья

    18 Цитирования (Scopus)

    Аннотация

    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.

    Язык оригиналаАнглийский
    Страницы (с-по)201-206
    Число страниц6
    ЖурналJournal of Materials Science and Technology
    Том35
    Номер выпуска1
    DOI
    СостояниеОпубликовано - 1 янв 2019

    ASJC Scopus subject areas

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

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  • Цитировать

    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