{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21774"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21774","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Atomic short-range order determination in gold-25 atomic percent iron and nickel-12.5 atomic percent silicon: A synchrotron x-ray diffuse scattering study","abstract":"The short-range order (SRO) structure of a Gold-25 atomic percent Iron single crystal was studied using wide-angle diffuse synchrotron x-radiation scattering at room temperature. Two heat-treatments were investigated; a 400$\\sp\\circ$C aging treatment for two days and a second at 440$\\sp\\circ$C for five days, both preceded by solution treatment in the single-phase field and water-quenched to room temperature. Evolution of the SRO structure with aging was determined by fitting the two sets of Cowley-Warren SRO parameters to a pair of 140,608-atom models. The microstructures, while quite disordered, showed a trend with aging for an increasing volume fraction of an Fe-enriched and an Fe-depleted environment. The Fe-enriched environment displayed a slight preference for Fe segregation to the $\\{$110$\\}$ and $\\{$100$\\}$ fcc matrix planes. A major portion of the Fe-depleted environment was found to contain elements (and variations of these elements) of the D1$\\sb{\\rm a}$ ordered superstructure. The SRO contained in the Fe-depleted environment may be best described in terms of the standing concentration wave packet (SCWP) model. This study provides, for the first time, a quantitative real-space view of the atomic arrangements which make up both environments in the SRO structure of Au-25at.%Fe.","abstract_html":"The short-range order (SRO) structure of a Gold-25 atomic percent Iron single crystal was studied using wide-angle diffuse synchrotron x-radiation scattering at room temperature. Two heat-treatments were investigated; a 400$\\sp\\circ$C aging treatment for two days and a second at 440$\\sp\\circ$C for five days, both preceded by solution treatment in the single-phase field and water-quenched to room temperature. Evolution of the SRO structure with aging was determined by fitting the two sets of Cowley-Warren SRO parameters to a pair of 140,608-atom models. The microstructures, while quite disordered, showed a trend with aging for an increasing volume fraction of an Fe-enriched and an Fe-depleted environment. The Fe-enriched environment displayed a slight preference for Fe segregation to the $\\{$110$\\}$ and $\\{$100$\\}$ fcc matrix planes. A major portion of the Fe-depleted environment was found to contain elements (and variations of these elements) of the D1$\\sb{\\rm a}$ ordered superstructure. The SRO contained in the Fe-depleted environment may be best described in terms of the standing concentration wave packet (SCWP) model. This study provides, for the first time, a quantitative real-space view of the atomic arrangements which make up both environments in the SRO structure of Au-25at.%Fe.","abstract_has_math":true,"creators":["Anderson, Jeffrey P."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Materials Engineering","degree_department":null,"school":null,"contributors":["Chen, Haydn"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:18:45Z","date_published":"2011-05-07T13:18:45Z","updated_at":"2026-07-22T22:25:18Z","subjects":["Engineering, Metallurgy","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1992 Anderson, Jeffrey P."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215768","(UMI)AAI9215768"],"render_values":[{"text":"AAI9215768","href":null,"code":true},{"text":"(UMI)AAI9215768","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21774","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Chen, Haydn"]},{"key":"dc:creator","label":"Author","values":["Anderson, Jeffrey P."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:18:45Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Engineering"]},{"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":["Engineering, Metallurgy","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 1992 Anderson, Jeffrey P."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215768","(UMI)AAI9215768","http://hdl.handle.net/2142/21774"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The short-range order (SRO) structure of a Gold-25 atomic percent Iron single crystal was studied using wide-angle diffuse synchrotron x-radiation scattering at room temperature. Two heat-treatments were investigated; a 400$\\sp\\circ$C aging treatment for two days and a second at 440$\\sp\\circ$C for five days, both preceded by solution treatment in the single-phase field and water-quenched to room temperature. Evolution of the SRO structure with aging was determined by fitting the two sets of Cowley-Warren SRO parameters to a pair of 140,608-atom models. The microstructures, while quite disordered, showed a trend with aging for an increasing volume fraction of an Fe-enriched and an Fe-depleted environment. The Fe-enriched environment displayed a slight preference for Fe segregation to the $\\{$110$\\}$ and $\\{$100$\\}$ fcc matrix planes. A major portion of the Fe-depleted environment was found to contain elements (and variations of these elements) of the D1$\\sb{\\rm a}$ ordered superstructure. The SRO contained in the Fe-depleted environment may be best described in terms of the standing concentration wave packet (SCWP) model. This study provides, for the first time, a quantitative real-space view of the atomic arrangements which make up both environments in the SRO structure of Au-25at.%Fe.","An equivalent study was performed on a water-quenched Ni-12.5at.%Si single crystal. The 140,608-atom model for this system did not display any long-range ordered domains of the equilibrium $\\gamma$$\\sp\\prime$ (L1$\\sb2$) superstructure. Rather, nearest-neighbor (nn) configurations C16, the basic structural element of $\\gamma$$\\sp\\prime$, and C17, a faulted variant of C16, were found to combine to form small domains resembling disordered embryos of the $\\gamma$$\\sp\\prime$ phase.","Made available in DSpace on 2011-05-07T13:18:45Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215768.pdf: 4948040 bytes, checksum: 1d7bfff1637e865f260353d7423164e4 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:31-05:00 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 short-range order determination in gold-25 atomic percent iron and nickel-12.5 atomic percent silicon: A synchrotron x-ray diffuse scattering study"]}]}],"canonical_facts":{"dc:contributor":["Chen, Haydn"],"dc:creator":["Anderson, Jeffrey P."],"dc:date":["2011-05-07T13:18:45Z","10000-01-01","1992"],"dc:description":["The short-range order (SRO) structure of a Gold-25 atomic percent Iron single crystal was studied using wide-angle diffuse synchrotron x-radiation scattering at room temperature. Two heat-treatments were investigated; a 400$\\sp\\circ$C aging treatment for two days and a second at 440$\\sp\\circ$C for five days, both preceded by solution treatment in the single-phase field and water-quenched to room temperature. Evolution of the SRO structure with aging was determined by fitting the two sets of Cowley-Warren SRO parameters to a pair of 140,608-atom models. The microstructures, while quite disordered, showed a trend with aging for an increasing volume fraction of an Fe-enriched and an Fe-depleted environment. The Fe-enriched environment displayed a slight preference for Fe segregation to the $\\{$110$\\}$ and $\\{$100$\\}$ fcc matrix planes. A major portion of the Fe-depleted environment was found to contain elements (and variations of these elements) of the D1$\\sb{\\rm a}$ ordered superstructure. The SRO contained in the Fe-depleted environment may be best described in terms of the standing concentration wave packet (SCWP) model. This study provides, for the first time, a quantitative real-space view of the atomic arrangements which make up both environments in the SRO structure of Au-25at.%Fe.","An equivalent study was performed on a water-quenched Ni-12.5at.%Si single crystal. The 140,608-atom model for this system did not display any long-range ordered domains of the equilibrium $\\gamma$$\\sp\\prime$ (L1$\\sb2$) superstructure. Rather, nearest-neighbor (nn) configurations C16, the basic structural element of $\\gamma$$\\sp\\prime$, and C17, a faulted variant of C16, were found to combine to form small domains resembling disordered embryos of the $\\gamma$$\\sp\\prime$ phase.","Made available in DSpace on 2011-05-07T13:18:45Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215768.pdf: 4948040 bytes, checksum: 1d7bfff1637e865f260353d7423164e4 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:53:07Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:24:31-05:00 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":["AAI9215768","(UMI)AAI9215768","http://hdl.handle.net/2142/21774"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Anderson, Jeffrey P."],"dc:subject":["Engineering, Metallurgy","Engineering, Materials Science"],"dc:title":["Atomic short-range order determination in gold-25 atomic percent iron and nickel-12.5 atomic percent silicon: A synchrotron x-ray diffuse scattering study"],"dc:type":["text"],"thesis:degree_discipline":["Materials Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:18Z"}