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Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal

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Abstract

Recently, the concept of supersonic N-crowdions was offered. In molecular dynamics simulations, they can be excited by initial kick of N neighboring atoms located in one close-packed atomic row along this row. In the present study, in 2D Morse crystal, we apply initial kick to M neighboring atoms located in neighboring close-packed atomic rows along these rows. This way, we initiate crowdion clusters called subsonic M-crowdions. It is well known that static 1-crowdion in 2D Morse lattice is unstable; as a result, the interstitial atom leaves the close-packed atomic row and becomes immobile. However, we show that 1-crowdion moving with sufficiently large subsonic velocity remains in the close-packed atomic row. Crowdion clusters with M equal to or greater than 2 appear to be stable even at rest, with growing M transforming into prismatic dislocation loops. It is important to note that stable subsonic M-crowdions (M > 1) remain mobile and they can carry interstitial atoms over long distances.

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ACKNOWLEDGMENTS

For Korznikova E.A., Shepelev I.A., and Chetverikov A.P. this work was supported by the Russian Science Foundation, grant no. 16-12-10175 (performing calculations, discussion of the numerical results and writing the paper). Dmitriev S.V. thanks the Russian Foundation for Basic Research, grant no. 17-02-00984-a (statement of the problem and discussion of the numerical results). This work was partly supported by the State Assignment of IMSP RAS.

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Authors and Affiliations

  1. Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 450001, Ufa, Russia

    E. A. Korznikova & S. V. Dmitriev

  2. Ufa State Aviation Technical University, 450008, Ufa, Russia

    E. A. Korznikova & S. Yu. Fomin

  3. Saratov Chernyshevsky National Research State University, 410012, Saratov, Russia

    E. A. Korznikova, I. A. Shepelev, A. P. Chetverikov & S. V. Dmitriev

  4. National Research Tomsk State University, 634050, Tomsk, Russia

    S. V. Dmitriev

  5. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore, Singapore

    Kun Zhou

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  1. E. A. Korznikova
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  2. I. A. Shepelev
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  3. A. P. Chetverikov
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  4. S. V. Dmitriev
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  5. S. Yu. Fomin
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  6. Kun Zhou
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Correspondence to E. A. Korznikova.

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Korznikova, E.A., Shepelev, I.A., Chetverikov, A.P. et al. Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal. J. Exp. Theor. Phys. 127, 1009–1015 (2018). https://doi.org/10.1134/S1063776118120063

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  • DOI: https://doi.org/10.1134/S1063776118120063

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