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Jaems F. Stubbins Giacobbe, Michael John, III 2015-09-28T14:51:23Z 2015-09-28T14:51:23Z 10000-01-01 1999 1999 Various electron and dual ion irradiations were conducted to investigate the effect of implanted solutes and heavy-ion cascades on the fluxes of freely-migrating defects which drive radiation-induced segregation (RIS) in Ni-9at.%Al and Cu-1at.%Au alloys. To study the effect of solute implantation on RIS, the segregation rate of Al atoms in Ni-9at.%Al following the implantation of Ne, Sc, or Zr was quantified using in-situ measurements of the growth rate of gamma '-Ni3Al precipitate zones produced during 900-keV electron irradiations between 450 and 625°C in a HVEM. It was found that the implantation of 0.06at.%Ne, 0.12at.%Sc, and 0.06at.%Zr resulted in very strong, small, and no RIS suppression in Ni-9at.%Al, respectively. The Ne effect increased with increasing implantation dose at 450°C and with increasing electron irradiation temperature between 550 and 625°C. In-situ Rutherford backscattering (RBS) was used to measure the RIS suppression effect of heavy-ion bombardment, i.e., 300-keV Al+, 800-keV Cu+, and 1.2-MeV Ag+, on 1.5-MeV He+-induced Au transport away from the near-surface region during concurrent He + and heavy-ion irradiation of Cu-1at.%Au at 400°C. Results demonstrated that the suppression of He+-induced RIS in Cu-1at.%Au caused by concurrent heavy-ion irradiation correlated well with the cascade volume produced by Al+, Cu+, or Ag+ per second and was independent of the heavy ion used. Computer simulations of dual beam experiments based on the Johnson-Lam model for RIS kinetics in binary alloys were also performed, and these simulations supported the RBS results. Made available in DSpace on 2015-09-28T14:51:23Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9944860.pdf: 6036381 bytes, checksum: 2c827573b824aa4dae5694ab4c8a30a1 (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 87226 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 143 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/85945 (MiAaPQ)AAI9944860 eng Engineering, Materials Science Effects of Implanted Solutes and Heavy -Ion Cascades on the Kinetics of Radiation -Induced Segregation in Binary Alloys text Nuclear Engineering Nuclear Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.