{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19733"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19733","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Transformation kinetics of delta prime precipitation in aluminum-lithium alloys","abstract":"Restriction data tranferred 2014-07-01T11:16:23-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","abstract_html":"Restriction data tranferred 2014-07-01T11:16:23-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","abstract_has_math":false,"creators":["Yu, Ming Sheng"],"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":"2011-05-07T12:16:47Z","date_published":"2011-05-07T12:16:47Z","updated_at":"2026-07-22T22:25:14Z","subjects":["Engineering, Metallurgy"],"languages":["eng"],"rights":["Copyright 1992 Yu, Ming Sheng"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215917","(UMI)AAI9215917"],"render_values":[{"text":"AAI9215917","href":null,"code":true},{"text":"(UMI)AAI9215917","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19733","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":["Yu, Ming Sheng"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:16:47Z","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"]}]},{"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 Yu, Ming Sheng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9215917","(UMI)AAI9215917","http://hdl.handle.net/2142/19733"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Restriction data tranferred 2014-07-01T11:16:23-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","The transformation kinetics of the early-stage of phase separation in an supersaturated Al-12 at.% Li alloy has been studied by means of time-resolved synchrotron radiation techniques. The simultaneous measurement of both the temporal evolution of the intensity profile from wide-angle x-ray diffraction (XRD) and small-angle x-ray scattering (SAXS) is a unique arrangement. The comparison of the integrated intensity from both the SAXS intensity profile and the XRD superlattice reflection provides the sequence of phase separation, such as ordering and decomposition. The combination of the rate of change of the integrated intensity from the superlattice reflection and the variation of ordered domain size suggest the likely division temperature, the congruent ordering temperature, T$\\sb{\\rm o}$, and the ordering instability temperature, T$\\sb{-}$. In addition, the phase separation models, such as Cahn-Hilliard-Cook (CHC), Langer-Bar on-Miller (LBM) and Furukawa have been tested using the results of synchrotron radiation measurements. The dynamical scaling of the SAXS intensity profiles and the power growth law of peak positions and intensities have also been investigated.","In the late-stage of phase separation, the study focuses on the coarsening kinetics behavior of Al alloys with 9.7 at.% and 7.9 at.% lithium. The kinetics parameters, i.e. coarsening rate constants are determined from the in situ conventional SAXS measurements. The diffusivity, D, and the activation energy, $\\gamma$, for the diffusion of lithium atoms within the solid solution can be calculated from these kinetics parameters. The correction for the volume fraction effect and the choice of the appropriate phase diagram can provide consistent and reasonable kinetics parameters.","Made available in DSpace on 2011-05-07T12:16:47Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215917.pdf: 5361151 bytes, checksum: 060da60e8fe0438718c182bbdcaef4e3 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:39:04Z Item is restricted indefinitely.","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Transformation kinetics of delta prime precipitation in aluminum-lithium alloys"]}]}],"canonical_facts":{"dc:contributor":["Chen, Haydn"],"dc:creator":["Yu, Ming Sheng"],"dc:date":["2011-05-07T12:16:47Z","10000-01-01","1992"],"dc:description":["Restriction data tranferred 2014-07-01T11:16:23-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","The transformation kinetics of the early-stage of phase separation in an supersaturated Al-12 at.% Li alloy has been studied by means of time-resolved synchrotron radiation techniques. The simultaneous measurement of both the temporal evolution of the intensity profile from wide-angle x-ray diffraction (XRD) and small-angle x-ray scattering (SAXS) is a unique arrangement. The comparison of the integrated intensity from both the SAXS intensity profile and the XRD superlattice reflection provides the sequence of phase separation, such as ordering and decomposition. The combination of the rate of change of the integrated intensity from the superlattice reflection and the variation of ordered domain size suggest the likely division temperature, the congruent ordering temperature, T$\\sb{\\rm o}$, and the ordering instability temperature, T$\\sb{-}$. In addition, the phase separation models, such as Cahn-Hilliard-Cook (CHC), Langer-Bar on-Miller (LBM) and Furukawa have been tested using the results of synchrotron radiation measurements. The dynamical scaling of the SAXS intensity profiles and the power growth law of peak positions and intensities have also been investigated.","In the late-stage of phase separation, the study focuses on the coarsening kinetics behavior of Al alloys with 9.7 at.% and 7.9 at.% lithium. The kinetics parameters, i.e. coarsening rate constants are determined from the in situ conventional SAXS measurements. The diffusivity, D, and the activation energy, $\\gamma$, for the diffusion of lithium atoms within the solid solution can be calculated from these kinetics parameters. The correction for the volume fraction effect and the choice of the appropriate phase diagram can provide consistent and reasonable kinetics parameters.","Made available in DSpace on 2011-05-07T12:16:47Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9215917.pdf: 5361151 bytes, checksum: 060da60e8fe0438718c182bbdcaef4e3 (MD5) Previous issue date: 1992","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:39:04Z Item is restricted indefinitely.","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9215917","(UMI)AAI9215917","http://hdl.handle.net/2142/19733"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Yu, Ming Sheng"],"dc:subject":["Engineering, Metallurgy"],"dc:title":["Transformation kinetics of delta prime precipitation in aluminum-lithium alloys"],"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":"2026-07-22T22:25:14Z"}