Relative efficiencies of different ions for producing freely migrating defects

L. E. Rehn, P. R. Okamoto, R. S. Averback

Research output: Contribution to journalArticlepeer-review


In situ experimental measurements of radiation-induced segregation rates in a Ni 12.7 at.% Si alloy during irradiation at temperatures from 350 to 650°C with several different ions are reported. A simple analytical model is used to extract the relative efficiency of each ion for producing freely migrating defects, i.e., those defects which are free to induce microstructural changes. A strong decrease in efficiency is observed with increasing ion mass. Irradiations producing average recoil energies of 1.8, 2.7, 51, and 74 keV are only 48%, 37%, 8%, and <2% as efficient, respectively, at introducing defects which are free to migrate long distances as an irradiation with a weighted average recoil energy of 730 eV. The results are compared to measurements of defect production efficiencies obtained by other techniques.

Original languageEnglish (US)
Pages (from-to)3073-3080
Number of pages8
JournalPhysical Review B
Issue number6
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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