{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22426"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22426","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effects of hydrogen on the deformation and fracture behavior of the metastable beta-titanium alloy, TIMETAL(RTM) 21S","abstract":"The metastable $\\beta$-titanium alloy, TIMETAL$\\sp\\circler$ 21S, exhibits a sharp ductile-to-brittle transition when the hydrogen concentration is increased slightly above H/M $=$ 0.22. To understand this sharp transition, a series of experiments was devised to test for the possible hydrogen embrittlement mechanisms. In situ straining experiments in an environmental cell TEM showed that hydrogen enhances the mobility of dislocations. However, this mechanism cannot account for the abrupt transition that is observed. No evidence for the formation of hydrides on fracture surfaces or in the stress fields of active cracks was found suggesting that the stress-induced hydride mechanism is not responsible for the observed transition. Therefore, the most viable mechanism is hydrogen-induced decohesion. Bulk testing showed that internal hydrogen reduces the yield strength of ductile specimens and decreases the fracture stress of the brittle specimens. All of the observed phenomena are consistent with a decohesion mechanism.","abstract_html":"The metastable <span class=\"etd-inline-math\">&beta;</span>-titanium alloy, TIMETAL$\\sp\\circler$ 21S, exhibits a sharp ductile-to-brittle transition when the hydrogen concentration is increased slightly above H/M $=$ 0.22. To understand this sharp transition, a series of experiments was devised to test for the possible hydrogen embrittlement mechanisms. In situ straining experiments in an environmental cell TEM showed that hydrogen enhances the mobility of dislocations. However, this mechanism cannot account for the abrupt transition that is observed. No evidence for the formation of hydrides on fracture surfaces or in the stress fields of active cracks was found suggesting that the stress-induced hydride mechanism is not responsible for the observed transition. Therefore, the most viable mechanism is hydrogen-induced decohesion. Bulk testing showed that internal hydrogen reduces the yield strength of ductile specimens and decreases the fracture stress of the brittle specimens. All of the observed phenomena are consistent with a decohesion mechanism.","abstract_has_math":true,"creators":["Teter, David F."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Engineering, Metallurgy","degree_department":null,"school":null,"contributors":["Robertson, Ian M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:39:28Z","date_published":"2011-05-07T13:39:28Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Engineering, Metallurgy","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1996 Teter, David F."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591199390","AAI9712457","(UMI)AAI9712457"],"render_values":[{"text":"9780591199390","href":null,"code":true},{"text":"AAI9712457","href":null,"code":true},{"text":"(UMI)AAI9712457","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22426","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Robertson, Ian M."]},{"key":"dc:creator","label":"Author","values":["Teter, David F."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:39:28Z","10000-01-01","1996"]},{"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 1996 Teter, David F."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591199390","AAI9712457","(UMI)AAI9712457","http://hdl.handle.net/2142/22426"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The metastable $\\beta$-titanium alloy, TIMETAL$\\sp\\circler$ 21S, exhibits a sharp ductile-to-brittle transition when the hydrogen concentration is increased slightly above H/M $=$ 0.22. To understand this sharp transition, a series of experiments was devised to test for the possible hydrogen embrittlement mechanisms. In situ straining experiments in an environmental cell TEM showed that hydrogen enhances the mobility of dislocations. However, this mechanism cannot account for the abrupt transition that is observed. No evidence for the formation of hydrides on fracture surfaces or in the stress fields of active cracks was found suggesting that the stress-induced hydride mechanism is not responsible for the observed transition. Therefore, the most viable mechanism is hydrogen-induced decohesion. Bulk testing showed that internal hydrogen reduces the yield strength of ductile specimens and decreases the fracture stress of the brittle specimens. All of the observed phenomena are consistent with a decohesion mechanism.","Made available in DSpace on 2011-05-07T13:39:28Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712457.pdf: 5187641 bytes, checksum: 049607aabd49dde607deb624e8f7bda5 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:32Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:59-05:00 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":["The effects of hydrogen on the deformation and fracture behavior of the metastable beta-titanium alloy, TIMETAL(RTM) 21S"]}]}],"canonical_facts":{"dc:contributor":["Robertson, Ian M."],"dc:creator":["Teter, David F."],"dc:date":["2011-05-07T13:39:28Z","10000-01-01","1996"],"dc:description":["The metastable $\\beta$-titanium alloy, TIMETAL$\\sp\\circler$ 21S, exhibits a sharp ductile-to-brittle transition when the hydrogen concentration is increased slightly above H/M $=$ 0.22. To understand this sharp transition, a series of experiments was devised to test for the possible hydrogen embrittlement mechanisms. In situ straining experiments in an environmental cell TEM showed that hydrogen enhances the mobility of dislocations. However, this mechanism cannot account for the abrupt transition that is observed. No evidence for the formation of hydrides on fracture surfaces or in the stress fields of active cracks was found suggesting that the stress-induced hydride mechanism is not responsible for the observed transition. Therefore, the most viable mechanism is hydrogen-induced decohesion. Bulk testing showed that internal hydrogen reduces the yield strength of ductile specimens and decreases the fracture stress of the brittle specimens. All of the observed phenomena are consistent with a decohesion mechanism.","Made available in DSpace on 2011-05-07T13:39:28Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712457.pdf: 5187641 bytes, checksum: 049607aabd49dde607deb624e8f7bda5 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:57:32Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:59-05:00 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":["9780591199390","AAI9712457","(UMI)AAI9712457","http://hdl.handle.net/2142/22426"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Teter, David F."],"dc:subject":["Engineering, Metallurgy","Engineering, Materials Science"],"dc:title":["The effects of hydrogen on the deformation and fracture behavior of the metastable beta-titanium alloy, TIMETAL(RTM) 21S"],"dc:type":["text"],"thesis:degree_discipline":["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":"2026-07-22T22:25:19Z"}