Effects of heavy-ion cascade volume on the suppression of radiation-induced segregation in alloys

M. J. Giacobbe, L. E. Rehn, N. Q. Lam, P. R. Okamoto, L. Funk, P. Baldo, A. McCormick, J. F. Stubbins

Research output: Contribution to journalConference articlepeer-review

Abstract

The interactions of cascade remnants with freely migrating defects (FMDs) during dual light and heavy-ion irradiations in Cu-1at.%Au at 400 °C were investigated using Rutherford backscattering spectrometry. Near-surface Au depletion driven by 1.5-MeV He ion irradiation was suppressed by concurrent bombardment with 1.2-MeV Ag ions. The dual irradiation effect suggests that short-lived cascade remnants created by heavy ions act as recombination centers for FMDs, reducing radiation-induced segregation (RIS). The effects of the total cascade volume generated by heavy-ion beams on the suppression of RIS were examined. The investigation revealed when 800-keV Cu and 1.2-MeV Ag ion beams produce nearly the same total cascade volume per second, their suppression effects on 1.5-MeV He-induced Au transport are also nearly equal even though the total cascade volume produced per ion for each are different. This result indicates that the suppression effect of cascade remnants produced by heavy ions depends on the total cascade volume induced per unit time and not on the total cascade volume per ion generated by individual ions of different mass and energy.

Original languageEnglish (US)
Pages (from-to)129-134
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume504
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 2 1997Dec 4 1997

ASJC Scopus subject areas

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

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