{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25594"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25594","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys","abstract":"The diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly to room temperature or quenching. The room temperature crystal morphology was then examined using x-ray diffraction. Alloy concentrations were chosen both to suppress the B-a transition and to obtain the metastable w-phase. [DATA]The hypothesized enhancement of diffusion by w-phase fluctuations or effects of the h.c.p. to b.c.c. phase transformation cannot be ruled out by this work, but are certainly not supported directly by the present results.","abstract_html":"The diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly to room temperature or quenching. The room temperature crystal morphology was then examined using x-ray diffraction. Alloy concentrations were chosen both to suppress the B-a transition and to obtain the metastable w-phase. [DATA]The hypothesized enhancement of diffusion by w-phase fluctuations or effects of the h.c.p. to b.c.c. phase transformation cannot be ruled out by this work, but are certainly not supported directly by the present results.","abstract_has_math":false,"creators":["Pontau, Arthur Erwin"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Lazarus, David"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-30T14:59:52Z","date_published":"2011-06-30T14:59:52Z","updated_at":"2026-07-22T22:25:24Z","subjects":["titanium","niobium","bcc alloys","diffusion coefficients","lathe sectioning techniques"],"languages":["en"],"rights":["1978 Arthur Erwin Pontau"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["356013"],"render_values":[{"text":"356013","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25594","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lazarus, David"]},{"key":"dc:creator","label":"Author","values":["Pontau, Arthur Erwin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-30T14:59:52Z","10000-01-01","1978"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["titanium","niobium","bcc alloys","diffusion coefficients","lathe sectioning techniques"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1978 Arthur Erwin Pontau"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["356013","http://hdl.handle.net/2142/25594"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly to room temperature or quenching. The room temperature crystal morphology was then examined using x-ray diffraction. Alloy concentrations were chosen both to suppress the B-a transition and to obtain the metastable w-phase. [DATA]The hypothesized enhancement of diffusion by w-phase fluctuations or effects of the h.c.p. to b.c.c. phase transformation cannot be ruled out by this work, but are certainly not supported directly by the present results.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T14:59:52Z No. of bitstreams: 1 1978_pontau.pdf: 2019782 bytes, checksum: cbe01dcb5b568ade69ca3d1f172dc02d (MD5)","Made available in DSpace on 2011-06-30T14:59:52Z (GMT). No. of bitstreams: 1 1978_pontau.pdf: 2019782 bytes, checksum: cbe01dcb5b568ade69ca3d1f172dc02d (MD5) Previous issue date: 1978","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T14:59:52Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys"]}]}],"canonical_facts":{"dc:contributor":["Lazarus, David"],"dc:creator":["Pontau, Arthur Erwin"],"dc:date":["2011-06-30T14:59:52Z","10000-01-01","1978"],"dc:description":["The diffusion coefficients for titanium and niobium radioactive tracers were simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly to room temperature or quenching. The room temperature crystal morphology was then examined using x-ray diffraction. Alloy concentrations were chosen both to suppress the B-a transition and to obtain the metastable w-phase. [DATA]The hypothesized enhancement of diffusion by w-phase fluctuations or effects of the h.c.p. to b.c.c. phase transformation cannot be ruled out by this work, but are certainly not supported directly by the present results.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T14:59:52Z No. of bitstreams: 1 1978_pontau.pdf: 2019782 bytes, checksum: cbe01dcb5b568ade69ca3d1f172dc02d (MD5)","Made available in DSpace on 2011-06-30T14:59:52Z (GMT). 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