Helium partitioning to the core-shelled Ta nanoclusters in nanocrystalline Cu-Ta alloy

S. Srinivasan, B. C. Hornbuckle, K. A. Darling, H. Kim, Y. Q. Wang, K. Solanki

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


In this work, a nanocrystalline (NC) Cu-10at.%Ta alloy is irradiated with helium at different temperatures to assess the stability and effectiveness of Ta nanoclusters in trapping helium and suppressing swelling. Advanced microstructural characterization of the room-temperature irradiated specimens indicated the presence of small He-bubbles (∼1-2 nm) at the peak damage depth mainly at the core and along the interface of Ta nanoclusters with Cu matrix. Few bubbles were found along grain boundaries, with much smaller bubbles homogenously distributed within the copper lattice. High-temperature irradiation exhibited bubbles of ∼3-5 nm, which were primarily associated with nanoclusters as compared to other locations, with no observed faceting of the bubbles. Atom probe analysis confirmed helium partitioning to the Ta nanoclusters indicating the effective entrapment of these He atoms.

Original languageEnglish (US)
Article number114344
JournalScripta Materialia
StatePublished - Feb 1 2022


  • Core-shell structure
  • Helium bubbles
  • Irradiation
  • Nanocrystalline

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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