{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23646"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23646","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Atomic transport mechanisms in irradiated copper(3)-gold alloy","abstract":"The properties of radiation-induced defects were investigated by examining the radiation-enhanced diffusion and radiation-induced order-disorder kinetics in the ordered intermetallic alloy Cu$\\sb3$Au.","abstract_html":"The properties of radiation-induced defects were investigated by examining the radiation-enhanced diffusion and radiation-induced order-disorder kinetics in the ordered intermetallic alloy Cu$\\sb3$Au.","abstract_has_math":true,"creators":["Lee, Young Suk"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics, Condensed Matter","degree_department":null,"school":null,"contributors":["Flynn, C.P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:21:49Z","date_published":"2011-05-07T14:21:49Z","updated_at":"2026-07-22T22:25:22Z","subjects":["Physics, Condensed Matter","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1996 Lee, Young Suk"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591088212","AAI9702578","(UMI)AAI9702578"],"render_values":[{"text":"9780591088212","href":null,"code":true},{"text":"AAI9702578","href":null,"code":true},{"text":"(UMI)AAI9702578","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23646","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Flynn, C.P."]},{"key":"dc:creator","label":"Author","values":["Lee, Young Suk"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:21:49Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics, Condensed Matter","Engineering, Materials Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Condensed Matter","Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Lee, Young Suk"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591088212","AAI9702578","(UMI)AAI9702578","http://hdl.handle.net/2142/23646"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The properties of radiation-induced defects were investigated by examining the radiation-enhanced diffusion and radiation-induced order-disorder kinetics in the ordered intermetallic alloy Cu$\\sb3$Au.","Direct measurements of thermal and radiation-enhanced diffusion on MBE grown Cu$\\sb3$Au films were performed for the first time both above and below the order-disorder transition temperature. Ni and Pd impurity tracers were employed to simulate the diffusion of Cu and Au respectively. Activation enthalpies of diffusion were obtained for the two tracers above and below the ordering temperature. Both diffusion coefficients were found to decrease significantly on ordering, by factors of two and four for thermal and radiation-enhanced diffusion respectively. The results indicate that interstitial atoms do not contribute to atomic transport in irradiated Cu$\\sb3$Au.","Radiation-induced order-disorder was studied under He and Ne irradiation. At low temperatures, T $\\le$ 250$\\sp\\circ$C, the order parameter, S, decayed exponentially with fluence owing to atomic mixing in displacement cascades. At high temperatures, T $\\ge$ 300$\\sp\\circ$C, S quickly reached a steady state indicating a dynamic balance between ordering and disordering processes. The studies revealed the surprising result that the rate of disordering increases strongly with temperature near the transition temperature and that this was due to disordering by vacancy fluxes to sinks.","Recovery of order in irradiated and unirradiated systems was also investigated. From measurements of reordering rates in the irradiated and unirradiated system, the defect concentrations in Cu$\\sb3$Au under the He irradiations were obtained for the first time. The results revealed that the vacancy concentration is ${\\sim}10\\sp{-9}$ and the interstitial concentration is ${\\sim}10\\sp{-4}$. The results also suggests that interstitials are clustered and immobile, explaining why they do not contribute to the diffusion process. Using measured defect concentrations from the ordering experiments, D$\\sb{\\rm RED}$ could be predicted to within a factor of three of the measured values.","Made available in DSpace on 2011-05-07T14:21:49Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702578.pdf: 6069873 bytes, checksum: 43aacd6691ac3b248264f93d14a805f8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:53Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:31:36-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Atomic transport mechanisms in irradiated copper(3)-gold alloy"]}]}],"canonical_facts":{"dc:contributor":["Flynn, C.P."],"dc:creator":["Lee, Young Suk"],"dc:date":["2011-05-07T14:21:49Z","10000-01-01","1996"],"dc:description":["The properties of radiation-induced defects were investigated by examining the radiation-enhanced diffusion and radiation-induced order-disorder kinetics in the ordered intermetallic alloy Cu$\\sb3$Au.","Direct measurements of thermal and radiation-enhanced diffusion on MBE grown Cu$\\sb3$Au films were performed for the first time both above and below the order-disorder transition temperature. Ni and Pd impurity tracers were employed to simulate the diffusion of Cu and Au respectively. Activation enthalpies of diffusion were obtained for the two tracers above and below the ordering temperature. Both diffusion coefficients were found to decrease significantly on ordering, by factors of two and four for thermal and radiation-enhanced diffusion respectively. The results indicate that interstitial atoms do not contribute to atomic transport in irradiated Cu$\\sb3$Au.","Radiation-induced order-disorder was studied under He and Ne irradiation. At low temperatures, T $\\le$ 250$\\sp\\circ$C, the order parameter, S, decayed exponentially with fluence owing to atomic mixing in displacement cascades. At high temperatures, T $\\ge$ 300$\\sp\\circ$C, S quickly reached a steady state indicating a dynamic balance between ordering and disordering processes. The studies revealed the surprising result that the rate of disordering increases strongly with temperature near the transition temperature and that this was due to disordering by vacancy fluxes to sinks.","Recovery of order in irradiated and unirradiated systems was also investigated. From measurements of reordering rates in the irradiated and unirradiated system, the defect concentrations in Cu$\\sb3$Au under the He irradiations were obtained for the first time. The results revealed that the vacancy concentration is ${\\sim}10\\sp{-9}$ and the interstitial concentration is ${\\sim}10\\sp{-4}$. The results also suggests that interstitials are clustered and immobile, explaining why they do not contribute to the diffusion process. Using measured defect concentrations from the ordering experiments, D$\\sb{\\rm RED}$ could be predicted to within a factor of three of the measured values.","Made available in DSpace on 2011-05-07T14:21:49Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9702578.pdf: 6069873 bytes, checksum: 43aacd6691ac3b248264f93d14a805f8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:53Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:31:36-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591088212","AAI9702578","(UMI)AAI9702578","http://hdl.handle.net/2142/23646"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Lee, Young Suk"],"dc:subject":["Physics, Condensed Matter","Engineering, Materials Science"],"dc:title":["Atomic transport mechanisms in irradiated copper(3)-gold alloy"],"dc:type":["text"],"thesis:degree_discipline":["Physics, Condensed Matter","Engineering, Materials Science"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:22Z"}