Surface deformations caused by high-dose high-energy helium, neon and argon ions

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In future thermonuclear reactors MeV energy helium ions will hit the first wall of the device, while energetic neutrons will also cause radiation damage. The scope of this paper is to offer a short review on the research on this topic taking place at the Central Research Institute for Physics. Helium ions in the energy range 0.8-3.5 MeV were implanted into various polycrystalline materials as well as single-crystal silicon wafers and amorphous metallic glasses. The layer above the projected range flaked off or blistered depending on the implantation energy and sample temperature. In several experiments the helium-rich zone of the exfoliated layer and the remaining bulk material suffered secondary surface deformations of a similar kind. It was pointed out that in certain cases the induced high lateral stresses caused a regular periodical rippling of the implanted layer in homogeneous materials. Implantations with wide energy distributions showed that the detaching process initiated at the depth of maximal helium concentration. To model the effect of simultaneous radiation damage neon and argon ions of energy 0.7 and 1.4 MeV were also applied in seperate experiments. In these cases the rippling of the implanted layer could be detected right on the target surface. Cylindrical blisters also appeared on single-crystal silicon. Radiation-enhanced and stress-oriented material transport is suspected to play an important role in these phenomena.

Original languageEnglish
Pages (from-to)57-62
Number of pages6
JournalMaterials Science and Engineering A
Issue numberC
Publication statusPublished - Aug 1 1989


ASJC Scopus subject areas

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

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