{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71816"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71816","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Hydrogen Embrittlement of Nickel","abstract":"Experiments were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored.","abstract_html":"Experiments were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored.","abstract_has_math":false,"creators":["Lassila, David H."],"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":2014,"date_issued":"2014-12-16T20:51:59Z","date_published":"2014-12-16T20:51:59Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Engineering, Metallurgy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8511631"],"render_values":[{"text":"(UMI)AAI8511631","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71816","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Lassila, David H."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T20:51:59Z","10000-01-01","1985"]},{"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/2142/71816","(UMI)AAI8511631"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Experiments were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored.","The results of this study show that the parameters affecting the diffusive segregation of hydrogen to grain boundaries play a fundamental role in conditions which result in embrittlement. If a sufficient quantity of hydrogen at grain boundaries is attained, the fracture mode of nickel will change from ductile rupture to intergranular. Experiments performed to evaluate the role of dislocation transport of hydrogen in the embrittlement of nickel suggest that dislocation transport has no effect on embrittlement and that the embrittlement mechanism is not dependent on hydrogen mobility.","An analysis of the thermodynamics and kinetics of hydrogen segregation yielded values for the binding enthalpy of hydrogen to nickel grain boundaries and the breadth of hydrogen enhancement at boundaries. By considering these values and other test results a mechanism of hydrogen embrittlement of nickel is proposed.","Three series of nickel tensile specimens were tested with various amounts of sulfur segregation present at grain boundaries. Segregation on the order of 0.1 monolayer has been shown to severely increase the embrittlement susceptibility of hydrogen charged nickel.","Made available in DSpace on 2014-12-16T20:51:59Z (GMT). No. of bitstreams: 1 8511631.pdf: 3204399 bytes, checksum: 2f1a0bf6a076cbc61ec6a7839e799265 (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71982 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","130 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."]},{"key":"dc:title","label":"Title","values":["Hydrogen Embrittlement of Nickel"]}]}],"canonical_facts":{"dc:creator":["Lassila, David H."],"dc:date":["2014-12-16T20:51:59Z","10000-01-01","1985"],"dc:description":["Experiments were performed to determine the effects of hydrogen segregation at grain boundaries on intergranular fracture of charged nickel deformed in tension. Two modes of hydrogen segregation are investigated; lattice diffusion and dislocation transport of "Cottrell atmospheres" of hydrogen. The effect of cosegregation of hydrogen and sulfur is also explored.","The results of this study show that the parameters affecting the diffusive segregation of hydrogen to grain boundaries play a fundamental role in conditions which result in embrittlement. If a sufficient quantity of hydrogen at grain boundaries is attained, the fracture mode of nickel will change from ductile rupture to intergranular. Experiments performed to evaluate the role of dislocation transport of hydrogen in the embrittlement of nickel suggest that dislocation transport has no effect on embrittlement and that the embrittlement mechanism is not dependent on hydrogen mobility.","An analysis of the thermodynamics and kinetics of hydrogen segregation yielded values for the binding enthalpy of hydrogen to nickel grain boundaries and the breadth of hydrogen enhancement at boundaries. By considering these values and other test results a mechanism of hydrogen embrittlement of nickel is proposed.","Three series of nickel tensile specimens were tested with various amounts of sulfur segregation present at grain boundaries. Segregation on the order of 0.1 monolayer has been shown to severely increase the embrittlement susceptibility of hydrogen charged nickel.","Made available in DSpace on 2014-12-16T20:51:59Z (GMT). No. of bitstreams: 1 8511631.pdf: 3204399 bytes, checksum: 2f1a0bf6a076cbc61ec6a7839e799265 (MD5) Previous issue date: 1985","Embargo set by: Seth Robbins for item 71982 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","130 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985."],"dc:identifier":["http://hdl.handle.net/2142/71816","(UMI)AAI8511631"],"dc:subject":["Engineering, Metallurgy"],"dc:title":["Hydrogen Embrittlement of Nickel"],"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"}