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Interaction of edge dislocations with voids in tungsten

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Abstract

Tungsten is widely used as a material capable of withstanding extreme operating conditions and is one of the candidates for use in fusion and Generation IV fission reactors. Atomistic modelling implemented to solve various material science problems is an indispensable approach for improving material properties. This work analyzes the interaction of an edge dislocation with a void in single-crystal tungsten with the help of molecular dynamics simulation. Two different approaches for studying the dynamics of dislocations in tungsten that differ in boundary conditions are compared. Multiple interactions of the dislocation and void at different temperatures are investigated, and based on the obtained stress–strain curves, the dislocation obstacle strength for voids having various diameters is defined. It is shown that when applied to a crystal with small voids, the model with the fixed boundary conditions returns incorrect results. Moreover, the influence of the cell size for the model with periodic boundary conditions is analyzed, and the case of a non-central interaction of a dislocation with a void is considered. The obtained results improve our understanding of the mechanical response of irradiated materials.

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The data generated during and/or analysed in this article are available from the corresponding author on reasonable request.

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  • 14 December 2023

    Affiliation 5 has been updated to the correct name.

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Acknowledgements

This work was financially supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the state task of the Ufa University of Science and Technologies (No. 075- 03-2023-119/1) of the youth research laboratory “Metals and Alloys under Extreme Impacts” (for BRI), the Council on Grants of the President of the Russian Federation (Grant no. NSh 4320.2022.1.2) (for KAM), the Russian Science Foundation (Grant no. 23-11-00364) (For EAK and SVD).

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Authors and Affiliations

  1. Research Laboratory for Metals and Alloys under Extreme Impacts, Ufa University of Science and Technology, Ufa, 450008, Russia

    Arseny Kazakov & Rita I. Babicheva

  2. Institute for Metals Superplasticity Problems of RAS, Ufa, 450001, Russia

    Arseny Kazakov

  3. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Rita I. Babicheva & Kun Zhou

  4. Institute for Nuclear Energy Technology, Belgian Nuclear Research Center, 2400, Mol, Belgium

    Aleksandr Zinovev & Dmitry Terentyev

  5. Technological Machines and Equipment Department, Ufa State Petroleum Technological University, Ufa, 450064, Russia

    Elena A. Korznikova

  6. Institute of Mechanical Science Problems of RAS, Saint Petersburg, 199178, Russia

    Elena A. Korznikova & Sergey V. Dmitriev

  7. Institute of Molecule and Crystal Physics, UFRC of Russian Academy of Sciences, Ufa, 450075, Russia

    Sergey V. Dmitriev

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  1. Arseny Kazakov
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Kazakov, A., Babicheva, R.I., Zinovev, A. et al. Interaction of edge dislocations with voids in tungsten. Tungsten 6, 633–646 (2024). https://doi.org/10.1007/s42864-023-00250-0

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