{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88334"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88334","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Investigation of lattice mismatch in rhenium containing nickel-base superalloys","abstract":"In this study, three techniques for measuring gamma/gamma prime lattice mismatch were examined on two alloys, each of which had two different ageing heat treatments, i.e. standard age and overaged. Each alloy contained a different Re content so that the effect of this element on lattice mismatch also could be investigated. The techniques used for measuring lattice mismatch were x-ray diffraction, convergent beam electron diffraction and interface dislocation analysis. Additionally, the electron microprobe was used to examine bulk homogeneity and a scanning transmission electron microscope equipped with a Kevex X-ray EDS system was used to examine phase compositions. From this study it was determined that the x-ray diffraction data and the CBED data yield the same results for room temperature lattice mismatch, although CBED requires a significant amount of data in order to be useful due to the scatter in the technique. The dislocation analysis technique gave larger negative values of mismatch. It is believed that these latter values represent those which exist at the aging temperature (1079°C). No effect of Re on lattice mismatch was observed, possibly due to the fact that the lower Re alloy contained more W.","abstract_html":"In this study, three techniques for measuring gamma/gamma prime lattice mismatch were examined on two alloys, each of which had two different ageing heat treatments, i.e. standard age and overaged. Each alloy contained a different Re content so that the effect of this element on lattice mismatch also could be investigated. The techniques used for measuring lattice mismatch were x-ray diffraction, convergent beam electron diffraction and interface dislocation analysis. Additionally, the electron microprobe was used to examine bulk homogeneity and a scanning transmission electron microscope equipped with a Kevex X-ray EDS system was used to examine phase compositions. From this study it was determined that the x-ray diffraction data and the CBED data yield the same results for room temperature lattice mismatch, although CBED requires a significant amount of data in order to be useful due to the scatter in the technique. The dislocation analysis technique gave larger negative values of mismatch. It is believed that these latter values represent those which exist at the aging temperature (1079°C). No effect of Re on lattice mismatch was observed, possibly due to the fact that the lower Re alloy contained more W.","abstract_has_math":false,"creators":["Lahrman, David Frank"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Metallurgical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-10-08T15:07:35Z","date_published":"2015-10-08T15:07:35Z","updated_at":"2026-07-22T22:26:32Z","subjects":["Lattice Mismatch","Alloys","Nickel-base Superalloys"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["Copyright David F. Lahrman, 1982"],"render_values":[{"text":"Copyright David F. 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Lahrman, 1982","http://hdl.handle.net/2142/88334"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this study, three techniques for measuring gamma/gamma prime lattice mismatch were examined on two alloys, each of which had two different ageing heat treatments, i.e. standard age and overaged. Each alloy contained a different Re content so that the effect of this element on lattice mismatch also could be investigated. The techniques used for measuring lattice mismatch were x-ray diffraction, convergent beam electron diffraction and interface dislocation analysis. Additionally, the electron microprobe was used to examine bulk homogeneity and a scanning transmission electron microscope equipped with a Kevex X-ray EDS system was used to examine phase compositions. From this study it was determined that the x-ray diffraction data and the CBED data yield the same results for room temperature lattice mismatch, although CBED requires a significant amount of data in order to be useful due to the scatter in the technique. The dislocation analysis technique gave larger negative values of mismatch. It is believed that these latter values represent those which exist at the aging temperature (1079°C). No effect of Re on lattice mismatch was observed, possibly due to the fact that the lower Re alloy contained more W.","PDF received from DCC and Submitted by Kelly Applegate (kappleg2@illinois.edu) on 2015-10-08T15:07:35Z No. of bitstreams: 1 976218.pdf: 6079679 bytes, checksum: 9958e5c817b948b04c734f68d716b02f (MD5)","Made available in DSpace on 2015-10-08T15:07:35Z (GMT). No. of bitstreams: 1 976218.pdf: 6079679 bytes, checksum: 9958e5c817b948b04c734f68d716b02f (MD5) Previous issue date: 1986","Original request to make dissertation available came to IDEALS from author on 2015-09-05 07:57 PM. Record accessible in archived OTRS Ticket #2015090528000074.","Request sent to DCC to digitize original paper dissertation on 2015-9-17. bibid is 976218 link to the record in the vufind: http://vufind.carli.illinois.edu/vf-uiu/Record/uiu_976218","Open"]},{"key":"dc:title","label":"Title","values":["Investigation of lattice mismatch in rhenium containing nickel-base superalloys"]}]}],"canonical_facts":{"dc:creator":["Lahrman, David Frank"],"dc:date":["2015-10-08T15:07:35Z","1986"],"dc:description":["In this study, three techniques for measuring gamma/gamma prime lattice mismatch were examined on two alloys, each of which had two different ageing heat treatments, i.e. standard age and overaged. Each alloy contained a different Re content so that the effect of this element on lattice mismatch also could be investigated. The techniques used for measuring lattice mismatch were x-ray diffraction, convergent beam electron diffraction and interface dislocation analysis. Additionally, the electron microprobe was used to examine bulk homogeneity and a scanning transmission electron microscope equipped with a Kevex X-ray EDS system was used to examine phase compositions. From this study it was determined that the x-ray diffraction data and the CBED data yield the same results for room temperature lattice mismatch, although CBED requires a significant amount of data in order to be useful due to the scatter in the technique. The dislocation analysis technique gave larger negative values of mismatch. It is believed that these latter values represent those which exist at the aging temperature (1079°C). No effect of Re on lattice mismatch was observed, possibly due to the fact that the lower Re alloy contained more W.","PDF received from DCC and Submitted by Kelly Applegate (kappleg2@illinois.edu) on 2015-10-08T15:07:35Z No. of bitstreams: 1 976218.pdf: 6079679 bytes, checksum: 9958e5c817b948b04c734f68d716b02f (MD5)","Made available in DSpace on 2015-10-08T15:07:35Z (GMT). No. of bitstreams: 1 976218.pdf: 6079679 bytes, checksum: 9958e5c817b948b04c734f68d716b02f (MD5) Previous issue date: 1986","Original request to make dissertation available came to IDEALS from author on 2015-09-05 07:57 PM. Record accessible in archived OTRS Ticket #2015090528000074.","Request sent to DCC to digitize original paper dissertation on 2015-9-17. bibid is 976218 link to the record in the vufind: http://vufind.carli.illinois.edu/vf-uiu/Record/uiu_976218","Open"],"dc:identifier":["Copyright David F. Lahrman, 1982","http://hdl.handle.net/2142/88334"],"dc:language":["en"],"dc:subject":["Lattice Mismatch","Alloys","Nickel-base Superalloys"],"dc:title":["Investigation of lattice mismatch in rhenium containing nickel-base superalloys"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Metallurgical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:32Z"}