{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/71794"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/71794","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Microstructure and Microchemistry of Rapidly Solidified Nickel-Base Powders","abstract":"An investigation of the microstructure and microchemistry of rapidly solidified powders was conducted using transmission electron microscopy in the scanning (STEM) and conventional (CTEM) modes. Using these high resolution techniques, it was possible to study the morphologies of the resultant microstructures and the associated chemical segregation on a very fine scale. Bulk undercooling experiments were also conducted and the microstructures of these samples were compared to those of the rapidly solidified powders. Computer calculations were performed to simulate the solidification of individual powder particles using Newtonian cooling, homogeneous nucleation, and growth theories. The results of these calculations were compared to experimental observations in order to develop an understanding of the mechanisms of solidification in rapidly quenched powders.","abstract_html":"An investigation of the microstructure and microchemistry of rapidly solidified powders was conducted using transmission electron microscopy in the scanning (STEM) and conventional (CTEM) modes. Using these high resolution techniques, it was possible to study the morphologies of the resultant microstructures and the associated chemical segregation on a very fine scale. Bulk undercooling experiments were also conducted and the microstructures of these samples were compared to those of the rapidly solidified powders. Computer calculations were performed to simulate the solidification of individual powder particles using Newtonian cooling, homogeneous nucleation, and growth theories. The results of these calculations were compared to experimental observations in order to develop an understanding of the mechanisms of solidification in rapidly quenched powders.","abstract_has_math":false,"creators":["Field, Robert Douglas"],"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":"2014-12-16T20:51:48Z","date_published":"2014-12-16T20:51:48Z","updated_at":"2026-07-22T22:26:05Z","subjects":["Engineering, Metallurgy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8302858"],"render_values":[{"text":"(UMI)AAI8302858","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/71794","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Field, Robert Douglas"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T20:51:48Z","10000-01-01","1982"]},{"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/2142/71794","(UMI)AAI8302858"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An investigation of the microstructure and microchemistry of rapidly solidified powders was conducted using transmission electron microscopy in the scanning (STEM) and conventional (CTEM) modes. Using these high resolution techniques, it was possible to study the morphologies of the resultant microstructures and the associated chemical segregation on a very fine scale. Bulk undercooling experiments were also conducted and the microstructures of these samples were compared to those of the rapidly solidified powders. Computer calculations were performed to simulate the solidification of individual powder particles using Newtonian cooling, homogeneous nucleation, and growth theories. The results of these calculations were compared to experimental observations in order to develop an understanding of the mechanisms of solidification in rapidly quenched powders.","Made available in DSpace on 2014-12-16T20:51:48Z (GMT). No. of bitstreams: 1 8302858.pdf: 4763674 bytes, checksum: 5045a375d7817fd1d4d94fcba41e9faf (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 71960 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","188 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["Microstructure and Microchemistry of Rapidly Solidified Nickel-Base Powders"]}]}],"canonical_facts":{"dc:creator":["Field, Robert Douglas"],"dc:date":["2014-12-16T20:51:48Z","10000-01-01","1982"],"dc:description":["An investigation of the microstructure and microchemistry of rapidly solidified powders was conducted using transmission electron microscopy in the scanning (STEM) and conventional (CTEM) modes. Using these high resolution techniques, it was possible to study the morphologies of the resultant microstructures and the associated chemical segregation on a very fine scale. Bulk undercooling experiments were also conducted and the microstructures of these samples were compared to those of the rapidly solidified powders. Computer calculations were performed to simulate the solidification of individual powder particles using Newtonian cooling, homogeneous nucleation, and growth theories. The results of these calculations were compared to experimental observations in order to develop an understanding of the mechanisms of solidification in rapidly quenched powders.","Made available in DSpace on 2014-12-16T20:51:48Z (GMT). No. of bitstreams: 1 8302858.pdf: 4763674 bytes, checksum: 5045a375d7817fd1d4d94fcba41e9faf (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 71960 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","188 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."],"dc:identifier":["http://hdl.handle.net/2142/71794","(UMI)AAI8302858"],"dc:subject":["Engineering, Metallurgy"],"dc:title":["Microstructure and Microchemistry of Rapidly Solidified Nickel-Base Powders"],"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"}