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Fragility under shocking: molecular dynamics insights into defect evolutions in tungsten lattice

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A Correction to this article was published on 21 August 2021

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Abstract

Tungsten has promising applications in high-radiation, high-erosion and high-impact environments. Laser peening is an effective method to enhance the surface mechanical properties of tungsten materials. However, the ultrafast dynamic mechanism of defect evolutions induced by laser shockwave in tungsten lattice is unclear. Here, we investigated the evolutions and interactions of various defects under ultrafast compressive process in tungsten lattice using molecular dynamic method. The results confirm the brittleness of tungsten and reveal that void can reduce the yield strain and strength of the tungsten lattice by accelerating defect mesh extension and promoting the dislocation nucleation around itself. Dislocation density is increased with compressive strain rate. Meanwhile, dislocation multiplication and motion reduce the elastic stage and play a dominant role during the plastic deformation of tungsten lattice. Additionally, void can disrupt the dislocation displacement and promote the pinning effect on dislocations by defect mesh extension.

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Acknowledgements

This work was financially support from the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25040201), and the National Natural Science Foundation of China (Grant No. 51727901). Qing Peng would like to acknowledge the support provided by the Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) (Grant No. DF201020). The numerical calculations in this paper were conducted on the supercomputing system at the Supercomputing Center of Wuhan University.

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Authors and Affiliations

  1. The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, China

    Peng-Jie Wang, Qiang Cao & Sheng Liu

  2. Physics Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Qing Peng

  3. K.A.CARE Energy Research and Innovation Center at Dhahran, Dhahran, 31261, Saudi Arabia

    Qing Peng

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  1. Peng-Jie Wang
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  2. Qiang Cao
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Contributions

Peng-Jie Wang, Qiang Cao and QingPeng conceived the idea and wrote the paper. Peng-Jie Wang did the experiments and simulations. Peng-Jie Wang and Sheng Liu performed the data analysis. All the authors had full discussions and comments on the paper.

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Correspondence to Qiang Cao or Qing Peng.

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Wang, PJ., Cao, Q., Liu, S. et al. Fragility under shocking: molecular dynamics insights into defect evolutions in tungsten lattice. Tungsten 3, 234–242 (2021). https://doi.org/10.1007/s42864-021-00087-5

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  • DOI: https://doi.org/10.1007/s42864-021-00087-5

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