{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88138"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88138","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Investigating the sink efficiencies of interfaces under irradiation","abstract":"Interfaces play an important role in material properties such as strength, cracking/fracture, work hardening, corrosion, and damage evolution under irradiation and deformation. Understanding interface-defect interactions that underlie these properties is a core motivation for studying interface phenomenon and is important in engineering design of next generation materials. Among all aspects, interface-vacancy interactions are an important building block to understand many classical structural-property relationships in polycrystals. Interfaces serve as sinks, sources or trap sites for vacancies, which facilitate creep, can drive interface migration, or serve as a vacancy-interstitial recombination site that results in an ideal lattice. This latter role provides a general approach to design radiation-tolerate materials. Previous works qualitatively investigated the ability of an interface to absorb non-equilibrium vacancies on different interfaces and grain boundaries via void denude zone (VDZ) experimental methods. However, a very limited number of quantitative studies of sink efficiency exist, and few systematic investigations comparing interfaces with different crystallography/orientation have been conducted. The importance of these phenomena and the limited experimental data in this area is the motivation of this thesis. Chapter 1 and Chapter 2 introduce the motivation and basic knowledge as well as details of the experimental techniques related to this work. Chapter 3 describes the experimental design for measuring the vacancy concentration profile in the vicinity of a Cu-Nb interface and explains how to extract the sink efficiency by comparing with a chemical rate equation. Chapter 4 is a systematic study for investigating the sink efficiency of different planar interfaces varying from semi/coherent to incoherent interfaces (Cu-Ni, Cu-V, Cu-Nb), demonstrating that sink efficiency varies as the coherency changes. Chapter 5 attempts to study the sink strength of the uniform distributed W nanoclusters/nanoprecipitates in Cu matrix produced by RT irradiation. The sink efficacy per unit area of nanoparticle-matrix interface is low relative to planar interfaces, but the high density of particles result in a similar reduction in non-equilibrium vacancy concentration in both the planar and nanoprecipitate systems. Chapter 6 describes an in-situ TEM nanocompression experiment designed to investigate the mechanical shear strength of a Cu-Nb interface as a function of irradiation dose at different temperatures. This property is used as a proxy for understanding the degree to which irradiation affects the interface structure, and suggests that steady-state behavior is established by a dose of 5 dpa.","abstract_html":"Interfaces play an important role in material properties such as strength, cracking/fracture, work hardening, corrosion, and damage evolution under irradiation and deformation. Understanding interface-defect interactions that underlie these properties is a core motivation for studying interface phenomenon and is important in engineering design of next generation materials. Among all aspects, interface-vacancy interactions are an important building block to understand many classical structural-property relationships in polycrystals. Interfaces serve as sinks, sources or trap sites for vacancies, which facilitate creep, can drive interface migration, or serve as a vacancy-interstitial recombination site that results in an ideal lattice. This latter role provides a general approach to design radiation-tolerate materials. Previous works qualitatively investigated the ability of an interface to absorb non-equilibrium vacancies on different interfaces and grain boundaries via void denude zone (VDZ) experimental methods. However, a very limited number of quantitative studies of sink efficiency exist, and few systematic investigations comparing interfaces with different crystallography/orientation have been conducted. The importance of these phenomena and the limited experimental data in this area is the motivation of this thesis. Chapter 1 and Chapter 2 introduce the motivation and basic knowledge as well as details of the experimental techniques related to this work. Chapter 3 describes the experimental design for measuring the vacancy concentration profile in the vicinity of a Cu-Nb interface and explains how to extract the sink efficiency by comparing with a chemical rate equation. Chapter 4 is a systematic study for investigating the sink efficiency of different planar interfaces varying from semi/coherent to incoherent interfaces (Cu-Ni, Cu-V, Cu-Nb), demonstrating that sink efficiency varies as the coherency changes. Chapter 5 attempts to study the sink strength of the uniform distributed W nanoclusters/nanoprecipitates in Cu matrix produced by RT irradiation. The sink efficacy per unit area of nanoparticle-matrix interface is low relative to planar interfaces, but the high density of particles result in a similar reduction in non-equilibrium vacancy concentration in both the planar and nanoprecipitate systems. Chapter 6 describes an in-situ TEM nanocompression experiment designed to investigate the mechanical shear strength of a Cu-Nb interface as a function of irradiation dose at different temperatures. This property is used as a proxy for understanding the degree to which irradiation affects the interface structure, and suggests that steady-state behavior is established by a dose of 5 dpa.","abstract_has_math":false,"creators":["Mao, Shimin"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Materials Science & Engr","degree_department":null,"school":null,"contributors":["Dillon, Shen","Averback, Robert S.","Johnson, Harley","Zuo, Jian-Min"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T20:49:26Z","date_published":"2015-09-29T20:49:26Z","updated_at":"2026-07-22T22:26:31Z","subjects":["nanolaminate","sink efficiency","interface","irradiation","defect","mechanical property"],"languages":["en"],"rights":["Copyright 2015 Shimin Mao"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88138","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dillon, Shen","Averback, Robert S.","Johnson, Harley","Zuo, Jian-Min"]},{"key":"dc:creator","label":"Author","values":["Mao, Shimin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-29T20:49:26Z","2017-09-30T09:15:35Z","2015-08","2015-05-27","2015-8"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Materials Science & 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":["nanolaminate","sink efficiency","interface","irradiation","defect","mechanical property"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Shimin Mao"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/88138"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Interfaces play an important role in material properties such as strength, cracking/fracture, work hardening, corrosion, and damage evolution under irradiation and deformation. Understanding interface-defect interactions that underlie these properties is a core motivation for studying interface phenomenon and is important in engineering design of next generation materials. Among all aspects, interface-vacancy interactions are an important building block to understand many classical structural-property relationships in polycrystals. Interfaces serve as sinks, sources or trap sites for vacancies, which facilitate creep, can drive interface migration, or serve as a vacancy-interstitial recombination site that results in an ideal lattice. This latter role provides a general approach to design radiation-tolerate materials. Previous works qualitatively investigated the ability of an interface to absorb non-equilibrium vacancies on different interfaces and grain boundaries via void denude zone (VDZ) experimental methods. However, a very limited number of quantitative studies of sink efficiency exist, and few systematic investigations comparing interfaces with different crystallography/orientation have been conducted. The importance of these phenomena and the limited experimental data in this area is the motivation of this thesis. Chapter 1 and Chapter 2 introduce the motivation and basic knowledge as well as details of the experimental techniques related to this work. Chapter 3 describes the experimental design for measuring the vacancy concentration profile in the vicinity of a Cu-Nb interface and explains how to extract the sink efficiency by comparing with a chemical rate equation. Chapter 4 is a systematic study for investigating the sink efficiency of different planar interfaces varying from semi/coherent to incoherent interfaces (Cu-Ni, Cu-V, Cu-Nb), demonstrating that sink efficiency varies as the coherency changes. Chapter 5 attempts to study the sink strength of the uniform distributed W nanoclusters/nanoprecipitates in Cu matrix produced by RT irradiation. The sink efficacy per unit area of nanoparticle-matrix interface is low relative to planar interfaces, but the high density of particles result in a similar reduction in non-equilibrium vacancy concentration in both the planar and nanoprecipitate systems. Chapter 6 describes an in-situ TEM nanocompression experiment designed to investigate the mechanical shear strength of a Cu-Nb interface as a function of irradiation dose at different temperatures. This property is used as a proxy for understanding the degree to which irradiation affects the interface structure, and suggests that steady-state behavior is established by a dose of 5 dpa.","Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01","The student, Shimin Mao, accepted the attached license on 2015-05-26 at 19:57.","The student, Shimin Mao, submitted this Dissertation for approval on 2015-05-26 at 20:15.","This Dissertation was approved for publication on 2015-05-27 at 16:18.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8249 on 2015-09-29 at 14:58:27","Made available in DSpace on 2015-09-29T20:49:26Z (GMT). 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Understanding interface-defect interactions that underlie these properties is a core motivation for studying interface phenomenon and is important in engineering design of next generation materials. Among all aspects, interface-vacancy interactions are an important building block to understand many classical structural-property relationships in polycrystals. Interfaces serve as sinks, sources or trap sites for vacancies, which facilitate creep, can drive interface migration, or serve as a vacancy-interstitial recombination site that results in an ideal lattice. This latter role provides a general approach to design radiation-tolerate materials. Previous works qualitatively investigated the ability of an interface to absorb non-equilibrium vacancies on different interfaces and grain boundaries via void denude zone (VDZ) experimental methods. However, a very limited number of quantitative studies of sink efficiency exist, and few systematic investigations comparing interfaces with different crystallography/orientation have been conducted. The importance of these phenomena and the limited experimental data in this area is the motivation of this thesis. Chapter 1 and Chapter 2 introduce the motivation and basic knowledge as well as details of the experimental techniques related to this work. Chapter 3 describes the experimental design for measuring the vacancy concentration profile in the vicinity of a Cu-Nb interface and explains how to extract the sink efficiency by comparing with a chemical rate equation. Chapter 4 is a systematic study for investigating the sink efficiency of different planar interfaces varying from semi/coherent to incoherent interfaces (Cu-Ni, Cu-V, Cu-Nb), demonstrating that sink efficiency varies as the coherency changes. Chapter 5 attempts to study the sink strength of the uniform distributed W nanoclusters/nanoprecipitates in Cu matrix produced by RT irradiation. The sink efficacy per unit area of nanoparticle-matrix interface is low relative to planar interfaces, but the high density of particles result in a similar reduction in non-equilibrium vacancy concentration in both the planar and nanoprecipitate systems. Chapter 6 describes an in-situ TEM nanocompression experiment designed to investigate the mechanical shear strength of a Cu-Nb interface as a function of irradiation dose at different temperatures. This property is used as a proxy for understanding the degree to which irradiation affects the interface structure, and suggests that steady-state behavior is established by a dose of 5 dpa.","Submission published under a 24 month embargo labeled 'U of I only', the embargo will last until 2017-08-01","The student, Shimin Mao, accepted the attached license on 2015-05-26 at 19:57.","The student, Shimin Mao, submitted this Dissertation for approval on 2015-05-26 at 20:15.","This Dissertation was approved for publication on 2015-05-27 at 16:18.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8249 on 2015-09-29 at 14:58:27","Made available in DSpace on 2015-09-29T20:49:26Z (GMT). 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