{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/122096"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/122096","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"In-situ 3D high-energy X-ray diffraction study on deformation behavior of neutron-irradiated Fe-9%Cr","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01","abstract_has_math":false,"creators":["Piedmont, Dominic"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Nuclear, Plasma, Radiolgc Engr","degree_department":null,"school":null,"contributors":["Stubbins, James","Zhang, Xuan","Heuser, Brent","Krogstad, Jessica","DiFulvio, Angela"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-12","date_published":"2023-12","updated_at":"2026-07-22T22:25:00Z","subjects":["Nuclear Materials","X-ray Diffraction","Irradiation Damage","Hedm","Machine Learning"],"languages":["en","eng"],"rights":["Copyright 2023 Dominic Piedmont"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/122096","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stubbins, James","Zhang, Xuan","Heuser, Brent","Krogstad, Jessica","DiFulvio, Angela"]},{"key":"dc:creator","label":"Author","values":["Piedmont, Dominic"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-12","2023-10-06"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear, Plasma, Radiolgc Engr"]},{"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":["Nuclear Materials","X-ray Diffraction","Irradiation Damage","Hedm","Machine Learning"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Dominic Piedmont"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/122096"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01","The student, Dominic Piedmont, accepted the attached license on 2023-10-03 at 10:58.","The student, Dominic Piedmont, submitted this Dissertation for approval on 2023-10-03 at 11:04.","This Dissertation was approved for publication on 2023-10-06 at 14:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19841 on 2024-03-01 at 13:29:30","Nuclear power offers a clean, sustainable alternative to fossil fuels that is compatible with the current energy infrastructure. Therefore, significant research has been directed to the development of the next generation of reactors. The higher neutron fluxes and temperature regime of future Gen IV reactors can provide enhance efficiency while improving safety margins. New reactor parameters, in conjunction with the corrosion challenges of new coolants/moderators, create new material challenges. Ensuring the safety of Gen IV reactors requires thorough Investigation and characterization of material properties and behaviors in these extreme environments. Conventionally, materials are characterized at discontinuous lengths scales: electron microscopy captures the micro-scale and tensile test capture bulk mechanical properties at the macro-scale. Often the grain level, or mesoscale, properties and behaviors are accessible. With development of new X-ray technologies, it has become possible to non-destructively probe the mesoscale in three dimensions and in-situ. This study is a first of its kind using High Energy Diffraction Microscopy (HEDM) to investigate a neutron irradiated ferritic/martensitic binary model alloy. Samples of Fe-9wt%Cr were cut into sub-sized tensile bars and exposed in the Advanced Test Reactor (ATR. This study examines two irradiated conditions: neutron irradiated to 0.1 dpa at 300C and 450C, respectively. The tensile properties of these samples along with an unirradiated sample were investigated at the Advance Photon Source (APS) at Argonne National Laboratory (ANL). The far-field (ff) field of view captured the evolution of in-situ aggregate grain properties and behaviors. Together with Crystal Plasticity Finite Element Modeling (CPFEM), a mechanistic understanding of grain rotation and its correlation with grain anisotropy and orientation to the loading direction was extracted. The near-field (nf) field of view captured three-dimensional grain volumes and morphologies. The higher resolution of nf provided localized dislocation and misorientation data to view the deformation properties within individual grains. Coupling the nf and ff datasets enhanced data processing while simultaneously increasing the amount of information possible to view via grain structures and residual stresses in the deformed volume renderings. Parameters from nf were provided to unsupervised machine learning algorithms to aid in data processing and identified useful insights within the dataset. Child domains distribution were established without ff information to improve nf as a standalone technique. Meanwhile, complete sub-grain volumes were identified to increase understanding deformation behavior of individual grains. The research produced valuable material understanding in regard to the effect of radiation on the development of deformation anisotropy and its impact on microstructure and mechanical properties while also developing HEDM as a characterization technique for meso-scale materials performance."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["In-situ 3D high-energy X-ray diffraction study on deformation behavior of neutron-irradiated Fe-9%Cr"]}]}],"canonical_facts":{"dc:contributor":["Stubbins, James","Zhang, Xuan","Heuser, Brent","Krogstad, Jessica","DiFulvio, Angela"],"dc:creator":["Piedmont, Dominic"],"dc:date":["2023-12","2023-10-06"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01","The student, Dominic Piedmont, accepted the attached license on 2023-10-03 at 10:58.","The student, Dominic Piedmont, submitted this Dissertation for approval on 2023-10-03 at 11:04.","This Dissertation was approved for publication on 2023-10-06 at 14:47.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19841 on 2024-03-01 at 13:29:30","Nuclear power offers a clean, sustainable alternative to fossil fuels that is compatible with the current energy infrastructure. Therefore, significant research has been directed to the development of the next generation of reactors. The higher neutron fluxes and temperature regime of future Gen IV reactors can provide enhance efficiency while improving safety margins. New reactor parameters, in conjunction with the corrosion challenges of new coolants/moderators, create new material challenges. Ensuring the safety of Gen IV reactors requires thorough Investigation and characterization of material properties and behaviors in these extreme environments. Conventionally, materials are characterized at discontinuous lengths scales: electron microscopy captures the micro-scale and tensile test capture bulk mechanical properties at the macro-scale. Often the grain level, or mesoscale, properties and behaviors are accessible. With development of new X-ray technologies, it has become possible to non-destructively probe the mesoscale in three dimensions and in-situ. This study is a first of its kind using High Energy Diffraction Microscopy (HEDM) to investigate a neutron irradiated ferritic/martensitic binary model alloy. Samples of Fe-9wt%Cr were cut into sub-sized tensile bars and exposed in the Advanced Test Reactor (ATR. This study examines two irradiated conditions: neutron irradiated to 0.1 dpa at 300C and 450C, respectively. The tensile properties of these samples along with an unirradiated sample were investigated at the Advance Photon Source (APS) at Argonne National Laboratory (ANL). The far-field (ff) field of view captured the evolution of in-situ aggregate grain properties and behaviors. Together with Crystal Plasticity Finite Element Modeling (CPFEM), a mechanistic understanding of grain rotation and its correlation with grain anisotropy and orientation to the loading direction was extracted. The near-field (nf) field of view captured three-dimensional grain volumes and morphologies. The higher resolution of nf provided localized dislocation and misorientation data to view the deformation properties within individual grains. Coupling the nf and ff datasets enhanced data processing while simultaneously increasing the amount of information possible to view via grain structures and residual stresses in the deformed volume renderings. Parameters from nf were provided to unsupervised machine learning algorithms to aid in data processing and identified useful insights within the dataset. Child domains distribution were established without ff information to improve nf as a standalone technique. Meanwhile, complete sub-grain volumes were identified to increase understanding deformation behavior of individual grains. The research produced valuable material understanding in regard to the effect of radiation on the development of deformation anisotropy and its impact on microstructure and mechanical properties while also developing HEDM as a characterization technique for meso-scale materials performance."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/122096"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Dominic Piedmont"],"dc:subject":["Nuclear Materials","X-ray Diffraction","Irradiation Damage","Hedm","Machine Learning"],"dc:title":["In-situ 3D high-energy X-ray diffraction study on deformation behavior of neutron-irradiated Fe-9%Cr"],"dc:type":["text"],"thesis:degree_discipline":["Nuclear, Plasma, Radiolgc Engr"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:00Z"}