Hybrid diffusive-displacive helium outgassing in Cu/Nb multilayer composites

Rui Gao, Miaomiao Jin, Qing Jie Li, Kang Pyo So, Lifeng Zhang, Xianping Wang, Qianfeng Fang, Cheng Sun, Lin Shao, Ju Li

Research output: Contribution to journalArticlepeer-review

Abstract

Gas generation degrades material properties in nuclear applications. The construction of self-assembled bubble channels was proposed to help release gas to the surface. In this study, thermal desorption spectroscopy, in-situ TEM heating and molecular dynamics simulations were carried out to assess the outgassing feasibility in helium-irradiated Cu/Nb multilayers with low structural damage. We found that the formation of outgassing networks has a hybrid diffusive-displacive nature, with diffusive bubble coalescence and crack-induced displacive fracture. The latter could destroy the integrity of the multilayer structure. This suggests that the outgassing strategy making use of self-assembled cavity networks should be carefully designed to avoid large-scale structural failure.

Original languageEnglish (US)
Article number113706
JournalScripta Materialia
Volume194
DOIs
StatePublished - Mar 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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