{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23694"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23694","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nanocrystalline copper-tantalum composites","abstract":"This research investigated the physical metallurgy, high temperatures coarsening, and processing/structure relationships for Cu$\\sb{\\rm 1-x}$Ta$\\sb{\\rm x}$ (x = $\\sim$5 to 20 atomic percent) alloys. These metastable alloys were produced using a plasma assisted physical vapor deposition (PAPVD) process which allowed ion bombardment during alloy deposition. Techniques used for structural and chemical analyses of these alloys include: transmission and scanning electron microscopy, energy dispersive x-ray analysis, x-ray diffraction, microhardness, and sheet resistance. PAPVD processing parameters varied in this study included: ion bombardment, ion to depositing atom ratio, deposition rate, and alloy composition. Thermal processing variations included: annealing at 800 C for up to 100 hours and at 900 C for up to 10 hours and hot isostatic pressing (HIP) at 900 C for 1 hour and 172 MPa.","abstract_html":"This research investigated the physical metallurgy, high temperatures coarsening, and processing/structure relationships for Cu$\\sb{\\rm 1-x}$Ta$\\sb{\\rm x}$ (x = $\\sim$5 to 20 atomic percent) alloys. These metastable alloys were produced using a plasma assisted physical vapor deposition (PAPVD) process which allowed ion bombardment during alloy deposition. Techniques used for structural and chemical analyses of these alloys include: transmission and scanning electron microscopy, energy dispersive x-ray analysis, x-ray diffraction, microhardness, and sheet resistance. PAPVD processing parameters varied in this study included: ion bombardment, ion to depositing atom ratio, deposition rate, and alloy composition. Thermal processing variations included: annealing at 800 C for up to 100 hours and at 900 C for up to 10 hours and hot isostatic pressing (HIP) at 900 C for 1 hour and 172 MPa.","abstract_has_math":true,"creators":["Savage, Howard Scott"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics, General","degree_department":null,"school":null,"contributors":["Rigsbee, J. Michael"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:23:35Z","date_published":"2011-05-07T14:23:35Z","updated_at":"2026-07-22T22:25:22Z","subjects":["Physics, General","Engineering, Metallurgy","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1991 Savage, Howard Scott"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9136723","(UMI)AAI9136723"],"render_values":[{"text":"AAI9136723","href":null,"code":true},{"text":"(UMI)AAI9136723","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23694","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rigsbee, J. 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These metastable alloys were produced using a plasma assisted physical vapor deposition (PAPVD) process which allowed ion bombardment during alloy deposition. Techniques used for structural and chemical analyses of these alloys include: transmission and scanning electron microscopy, energy dispersive x-ray analysis, x-ray diffraction, microhardness, and sheet resistance. PAPVD processing parameters varied in this study included: ion bombardment, ion to depositing atom ratio, deposition rate, and alloy composition. Thermal processing variations included: annealing at 800 C for up to 100 hours and at 900 C for up to 10 hours and hot isostatic pressing (HIP) at 900 C for 1 hour and 172 MPa.","\"This research successfully demonstrated that physical vapor deposition processes can \"\"design\"\" the microstructures of metastable Cu$\\sb{\\rm 1-x}$Ta$\\sb{\\rm x}$ alloys at the near atomic scale. These alloys consist of an essentially pure Cu matrix with a dispersion of discrete, nanoscale second phase particles. For as-deposited alloys: (1) the Cu matrix morphology was dependent on Ta content and ion bombardment and the film densities increased with decreasing Ta content and increasing ion bombardment and (2) the second phase particles consisted of bcc Ta, fcc Ta, and Ta oxide, the particle size was dependent on Ta content and ion bombardment, and the particles were mainly smaller than 10 nm. For annealed alloys: (1) annealing at 900 C for 10 hours altered only slightly the matrix morphology and showed that the second phase particles are effective at pinning Cu grain boundaries, consistent with the predictions of the Zener model; (2) the second phase particles remained bcc Ta, fcc Ta, and Ta oxide, with sizes still $<$10 nm; (3) oxygen incorporation into the growing coating stabilized the annealed particle sizes; (4) the matrix and second phase morphologies in HIPped alloys coarsened more in regions which underwent greater plastic strains; and, (5) Ta particle coarsening occurred by the Ostwald mechanism (annealed alloys) as well as collisional coalescence (HIPped alloys).\"","Made available in DSpace on 2011-05-07T14:23:35Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9136723.pdf: 6487063 bytes, checksum: 3f1c9f3f6e21f61420c59ba35d95a649 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:06:13Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:31:46-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Nanocrystalline copper-tantalum composites"]}]}],"canonical_facts":{"dc:contributor":["Rigsbee, J. Michael"],"dc:creator":["Savage, Howard Scott"],"dc:date":["2011-05-07T14:23:35Z","10000-01-01","1991"],"dc:description":["This research investigated the physical metallurgy, high temperatures coarsening, and processing/structure relationships for Cu$\\sb{\\rm 1-x}$Ta$\\sb{\\rm x}$ (x = $\\sim$5 to 20 atomic percent) alloys. These metastable alloys were produced using a plasma assisted physical vapor deposition (PAPVD) process which allowed ion bombardment during alloy deposition. Techniques used for structural and chemical analyses of these alloys include: transmission and scanning electron microscopy, energy dispersive x-ray analysis, x-ray diffraction, microhardness, and sheet resistance. PAPVD processing parameters varied in this study included: ion bombardment, ion to depositing atom ratio, deposition rate, and alloy composition. Thermal processing variations included: annealing at 800 C for up to 100 hours and at 900 C for up to 10 hours and hot isostatic pressing (HIP) at 900 C for 1 hour and 172 MPa.","\"This research successfully demonstrated that physical vapor deposition processes can \"\"design\"\" the microstructures of metastable Cu$\\sb{\\rm 1-x}$Ta$\\sb{\\rm x}$ alloys at the near atomic scale. These alloys consist of an essentially pure Cu matrix with a dispersion of discrete, nanoscale second phase particles. For as-deposited alloys: (1) the Cu matrix morphology was dependent on Ta content and ion bombardment and the film densities increased with decreasing Ta content and increasing ion bombardment and (2) the second phase particles consisted of bcc Ta, fcc Ta, and Ta oxide, the particle size was dependent on Ta content and ion bombardment, and the particles were mainly smaller than 10 nm. For annealed alloys: (1) annealing at 900 C for 10 hours altered only slightly the matrix morphology and showed that the second phase particles are effective at pinning Cu grain boundaries, consistent with the predictions of the Zener model; (2) the second phase particles remained bcc Ta, fcc Ta, and Ta oxide, with sizes still $<$10 nm; (3) oxygen incorporation into the growing coating stabilized the annealed particle sizes; (4) the matrix and second phase morphologies in HIPped alloys coarsened more in regions which underwent greater plastic strains; and, (5) Ta particle coarsening occurred by the Ostwald mechanism (annealed alloys) as well as collisional coalescence (HIPped alloys).\"","Made available in DSpace on 2011-05-07T14:23:35Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9136723.pdf: 6487063 bytes, checksum: 3f1c9f3f6e21f61420c59ba35d95a649 (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:06:13Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:31:46-05:00 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":["AAI9136723","(UMI)AAI9136723","http://hdl.handle.net/2142/23694"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Savage, Howard Scott"],"dc:subject":["Physics, General","Engineering, Metallurgy","Engineering, Materials Science"],"dc:title":["Nanocrystalline copper-tantalum composites"],"dc:type":["text"],"thesis:degree_discipline":["Physics, General","Engineering, Metallurgy","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"}