{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71802"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71802","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"X-Ray Topographic Studies of Deformation in Niobium and Dilute Niobium-Hydrogen Alloys","abstract":"An experimental study of the deformation at a notch under tensile loading and by hydride precipitation has been conducted with x-ray diffraction topography. Lang topography, asymmetric crystal topography (ACT) and synchrotron white beam topography (WBT) were applied in this study. Crystals suitable for transmission x-ray topography (i.e. dislocation densities below 10('6) cm('-2)) were grown by the strain-anneal technique from ribbons of polycrystalline niobium of thickness less than 0.2 mm.","abstract_html":"An experimental study of the deformation at a notch under tensile loading and by hydride precipitation has been conducted with x-ray diffraction topography. Lang topography, asymmetric crystal topography (ACT) and synchrotron white beam topography (WBT) were applied in this study. Crystals suitable for transmission x-ray topography (i.e. dislocation densities below 10('6) cm('-2)) were grown by the strain-anneal technique from ribbons of polycrystalline niobium of thickness less than 0.2 mm.","abstract_has_math":false,"creators":["Stock, Stuart Rand"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Metallurgical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1983,"date_issued":"1983","date_published":"1983","updated_at":"2026-07-22T22:26:05Z","subjects":["Engineering, Metallurgy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8324649"],"render_values":[{"text":"(UMI)AAI8324649","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71802","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Stock, Stuart Rand"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1983","2014-12-16T20:51:52Z","10000-01-01"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Metallurgical 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":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/71802","(UMI)AAI8324649"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An experimental study of the deformation at a notch under tensile loading and by hydride precipitation has been conducted with x-ray diffraction topography. Lang topography, asymmetric crystal topography (ACT) and synchrotron white beam topography (WBT) were applied in this study. Crystals suitable for transmission x-ray topography (i.e. dislocation densities below 10('6) cm('-2)) were grown by the strain-anneal technique from ribbons of polycrystalline niobium of thickness less than 0.2 mm.","A technique, also applicable to crystals in which the dislocation density is too high to allow the resolution of individual defects, is developed whereby the strain tensor about an arbitrary strain center may be determined from the relationship between the incremental rotation of the specimen and the resulting equi-inclination contour spacing. The analysis is used to estimate some of the strain tensor components about a precipitate of (beta)-NbH in a niobium crystal from measurements taken with characteristic x-radiation. Application of the analysis to synchrotron topography is also discussed.","The generation of plasticity at a notch was studied in situ with ACT and WBT. Specimens of niobium were tested mainly at ambient temperatures although one specimen was tested at 158 K; only one specimen was a hydrogen alloy and it contained 1.8 atomic percent hydrogen. The crystals were deformed, and the resulting slip was found to agree with earlier studies.","Made available in DSpace on 2014-12-16T20:51:52Z (GMT). No. of bitstreams: 1 8324649.pdf: 11897226 bytes, checksum: 07886585809768b09425813f832da4d8 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 71968 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","307 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."]},{"key":"dc:title","label":"Title","values":["X-Ray Topographic Studies of Deformation in Niobium and Dilute Niobium-Hydrogen Alloys"]}]}],"canonical_facts":{"dc:creator":["Stock, Stuart Rand"],"dc:date":["1983","2014-12-16T20:51:52Z","10000-01-01"],"dc:description":["An experimental study of the deformation at a notch under tensile loading and by hydride precipitation has been conducted with x-ray diffraction topography. Lang topography, asymmetric crystal topography (ACT) and synchrotron white beam topography (WBT) were applied in this study. Crystals suitable for transmission x-ray topography (i.e. dislocation densities below 10('6) cm('-2)) were grown by the strain-anneal technique from ribbons of polycrystalline niobium of thickness less than 0.2 mm.","A technique, also applicable to crystals in which the dislocation density is too high to allow the resolution of individual defects, is developed whereby the strain tensor about an arbitrary strain center may be determined from the relationship between the incremental rotation of the specimen and the resulting equi-inclination contour spacing. The analysis is used to estimate some of the strain tensor components about a precipitate of (beta)-NbH in a niobium crystal from measurements taken with characteristic x-radiation. Application of the analysis to synchrotron topography is also discussed.","The generation of plasticity at a notch was studied in situ with ACT and WBT. Specimens of niobium were tested mainly at ambient temperatures although one specimen was tested at 158 K; only one specimen was a hydrogen alloy and it contained 1.8 atomic percent hydrogen. The crystals were deformed, and the resulting slip was found to agree with earlier studies.","Made available in DSpace on 2014-12-16T20:51:52Z (GMT). No. of bitstreams: 1 8324649.pdf: 11897226 bytes, checksum: 07886585809768b09425813f832da4d8 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 71968 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","307 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."],"dc:identifier":["http://hdl.handle.net/2142/71802","(UMI)AAI8324649"],"dc:subject":["Engineering, Metallurgy"],"dc:title":["X-Ray Topographic Studies of Deformation in Niobium and Dilute Niobium-Hydrogen Alloys"],"dc:type":["text"],"thesis:degree_discipline":["Metallurgical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:05Z"}