{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22509"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22509","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"An in-situ x-ray diffraction study of decomposition kinetics in a nickel-12.5 at.\\% aluminum alloy","abstract":"Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:06Z Item is restricted indefinitely.","abstract_html":"Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:06Z Item is restricted indefinitely.","abstract_has_math":false,"creators":["Marsh, Charles P."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Engineering, Metallurgy","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:42:06Z","date_published":"2011-05-07T13:42:06Z","updated_at":"2026-07-22T22:25:20Z","subjects":["Engineering, Metallurgy","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1989 Marsh, Charles P."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010951","(UMI)AAI9010951"],"render_values":[{"text":"AAI9010951","href":null,"code":true},{"text":"(UMI)AAI9010951","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22509","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Marsh, Charles P."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:42:06Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Engineering, Metallurgy","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":["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 1989 Marsh, Charles P."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010951","(UMI)AAI9010951","http://hdl.handle.net/2142/22509"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:58:06Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:27:18-05:00 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","An in-situ study of the phase decomposition or precipitation reaction of a supersaturated solid solution single crystal of Ni-12.5 at.% Al alloy was performed for moderately high temperatures. The superlattice peaks caused by the coarsening reaction of the Ni$\\sb3$Al phase were continuously monitored over time using wide angle x-ray diffraction. The Sherrer formula was used to calculate the average particle size. Higher order peaks were checked for broadening caused by strain and no significant effect was found. The integrated intensity from the superlattice peaks was also measured and was related to the total volume fraction of the second phase as the microstructure evolved. Interpreting the data using the diffusion-controlled coarsening theory of Lifshitz and Slyozov, both the diffusion coefficient and the interfacial energy between the matrix and precipitates were experimentally determined for temperatures in the range of 550 to 700$\\sp\\circ$C. In addition, for two temperatures the coarsening rate was found to be different for two crystallographic directions. This difference is suggested to be related to the precipitate morphology change from sphere to cuboid evidenced in many Ni-base alloys. In addition the correlated arrangement of the precipitates was qualitatively measured by using small angle neutron scattering at different times during the decomposition and was found to be definitely present at the beginning of coarsening. It is also suggested that the 500$\\sp\\circ$C data of this work as well as the observed low temperature excess diffusion can be explained by an ordering process which occurs before the classical coarsening decomposition process becomes dominant.","Made available in DSpace on 2011-05-07T13:42:06Z (GMT). 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The superlattice peaks caused by the coarsening reaction of the Ni$\\sb3$Al phase were continuously monitored over time using wide angle x-ray diffraction. The Sherrer formula was used to calculate the average particle size. Higher order peaks were checked for broadening caused by strain and no significant effect was found. The integrated intensity from the superlattice peaks was also measured and was related to the total volume fraction of the second phase as the microstructure evolved. Interpreting the data using the diffusion-controlled coarsening theory of Lifshitz and Slyozov, both the diffusion coefficient and the interfacial energy between the matrix and precipitates were experimentally determined for temperatures in the range of 550 to 700$\\sp\\circ$C. In addition, for two temperatures the coarsening rate was found to be different for two crystallographic directions. This difference is suggested to be related to the precipitate morphology change from sphere to cuboid evidenced in many Ni-base alloys. In addition the correlated arrangement of the precipitates was qualitatively measured by using small angle neutron scattering at different times during the decomposition and was found to be definitely present at the beginning of coarsening. It is also suggested that the 500$\\sp\\circ$C data of this work as well as the observed low temperature excess diffusion can be explained by an ordering process which occurs before the classical coarsening decomposition process becomes dominant.","Made available in DSpace on 2011-05-07T13:42:06Z (GMT). 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