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April 27, 2026Journal of Nuclear MaterialsOpen Access

Helium Defect Morphology Governs Impact-Induced Cratering and Ejecta in Tungsten

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Authors

PDP. DwivediCzech Technical University in PragueNDN. DaghboujTPT. Polcar

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Implication

Randomized trial quantifies impact damage in tungsten, indicating the role of helium morphology on outcomes.

Key Points

  • This research aims to explore how helium-induced microstructural changes in tungsten affect cratering and ejecta during impact events.
  • Utilized large-scale molecular dynamics simulations to model tungsten interactions under high-velocity dust impacts.
  • Analyzed various helium topologies including sparse and dense bubble arrays, isolated bubbles, and helium platelets over impact velocities of 3.5 to 4.5 km/s.
  • Assessed crater volume, ejecta behavior, and dislocation density profile post-impacts.
  • Pristine tungsten showed lower crater volume and ejecta compared to all helium topology variations, especially the platelets which produced significantly larger ejecta bursts (ejecta volume significantly higher).
  • Bubble arrays enhanced plastic cratering and elevated steady ejecta performance due to their compliant nature, compared to pristine tungsten.
  • Dislocation density profiles indicated localized plasticity in bubble arrays and increased decohesion in platelets during impacts.

Cite This Study

Dwivedi et al. (2026) studied this question.

synapsesocial.com/papers/69eefcaefede9185760d3998https://doi.org/10.1016/j.jnucmat.2026.156695
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