Origin of increased helium density inside bubbles in Ni(1−x)Fex alloys

F. Granberg, X. Wang, D. Chen, K. Jin, Y. Wang, H. Bei, W. J. Weber, Y. Zhang, K. L. More, K. Nordlund, F. Djurabekova

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Due to virtually no solubility, He atoms implanted or created inside materials tend to form bubbles, which are known to damage material properties through embrittlement. Higher He density in nano-sized bubbles was observed both experimentally and computationally in Ni(100−x)Fex-alloy samples compared to Ni. The bubbles in the Ni(100−x)Fex-alloys were observed to be faceted, whereas in elemental Ni they were more spherical. Molecular dynamics simulations showed that stacking fault structures formed around bubbles at maximum He density. Higher Fe concentrations stabilize stacking fault structures, suppress evolution of dislocation network around bubbles and suppress complete dislocation emission, leading to higher He density.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalScripta Materialia
StatePublished - Jan 15 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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