E-Thesis 430 views
High integrity joining and Repair of Gamma Titanium Aluminides / Paul Fitzgerald
Swansea University Author: Paul Fitzgerald
DOI (Published version): 10.23889/SUthesis.61651
Abstract
Gamma Titanium Aluminide alloys are brittle, expensive, and difficult to repair using conventional fabrication techniques, so a unique and bespoke viable bonding technique utilising induction heating and argon gas shielding was investigated. Ti-45Al-2Mn-2Nb-0.8B Titanium Aluminide alloy was used whi...
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Swansea
2022
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Institution: | Swansea University |
Degree level: | Doctoral |
Degree name: | EngD |
Supervisor: | Brown, Steven |
URI: | https://cronfa.swan.ac.uk/Record/cronfa61651 |
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2022-10-24T15:27:35Z |
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2023-01-13T19:22:32Z |
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2022-10-24T16:39:44.2547002 v2 61651 2022-10-24 High integrity joining and Repair of Gamma Titanium Aluminides 2b8d751cf0322af15d42ba161f3cf941 Paul Fitzgerald Paul Fitzgerald true false 2022-10-24 MTLS Gamma Titanium Aluminide alloys are brittle, expensive, and difficult to repair using conventional fabrication techniques, so a unique and bespoke viable bonding technique utilising induction heating and argon gas shielding was investigated. Ti-45Al-2Mn-2Nb-0.8B Titanium Aluminide alloy was used which had been HIPped and electro-discharge machined into test pieces for bonding where the feedstock for the powder was generated via gas atomisation. The powder had a fine cellular microstructure and was used in a thin interlayer between the two surfaces to be bonded consisting of feedstock powder with cellulose and glycerol to form a paste. Analysis of small-scale porosity in the completed bonds showed the final bonds had minimal porosity. The hardness data indicated the interlayer was over-matched compared to the parent material. A limited number of LCF specimens showed that the high hardness of the interlayer causes the specimens to fail away from the interlayer as long as specimen preparation was performed correctly. Inadequate specimen preparation leads to potentially serious porous defects. The bonds produced were of good quality, at least as good as the parent material. E-Thesis Swansea 21 10 2022 2022-10-21 10.23889/SUthesis.61651 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University Brown, Steven Doctoral EngD EPSRC doctoral training grant 2022-10-24T16:39:44.2547002 2022-10-24T16:24:50.6896484 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Paul Fitzgerald 1 Under embargo Under embargo 2022-10-24T16:33:23.5795728 Output 29694445 application/pdf E-Thesis – open access true 2027-10-21T00:00:00.0000000 Copyright: The author, Paul J. Fitzgerald, 2022. true eng |
title |
High integrity joining and Repair of Gamma Titanium Aluminides |
spellingShingle |
High integrity joining and Repair of Gamma Titanium Aluminides Paul Fitzgerald |
title_short |
High integrity joining and Repair of Gamma Titanium Aluminides |
title_full |
High integrity joining and Repair of Gamma Titanium Aluminides |
title_fullStr |
High integrity joining and Repair of Gamma Titanium Aluminides |
title_full_unstemmed |
High integrity joining and Repair of Gamma Titanium Aluminides |
title_sort |
High integrity joining and Repair of Gamma Titanium Aluminides |
author_id_str_mv |
2b8d751cf0322af15d42ba161f3cf941 |
author_id_fullname_str_mv |
2b8d751cf0322af15d42ba161f3cf941_***_Paul Fitzgerald |
author |
Paul Fitzgerald |
author2 |
Paul Fitzgerald |
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E-Thesis |
publishDate |
2022 |
institution |
Swansea University |
doi_str_mv |
10.23889/SUthesis.61651 |
college_str |
Faculty of Science and Engineering |
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facultyofscienceandengineering |
hierarchy_top_title |
Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
department_str |
School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering |
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description |
Gamma Titanium Aluminide alloys are brittle, expensive, and difficult to repair using conventional fabrication techniques, so a unique and bespoke viable bonding technique utilising induction heating and argon gas shielding was investigated. Ti-45Al-2Mn-2Nb-0.8B Titanium Aluminide alloy was used which had been HIPped and electro-discharge machined into test pieces for bonding where the feedstock for the powder was generated via gas atomisation. The powder had a fine cellular microstructure and was used in a thin interlayer between the two surfaces to be bonded consisting of feedstock powder with cellulose and glycerol to form a paste. Analysis of small-scale porosity in the completed bonds showed the final bonds had minimal porosity. The hardness data indicated the interlayer was over-matched compared to the parent material. A limited number of LCF specimens showed that the high hardness of the interlayer causes the specimens to fail away from the interlayer as long as specimen preparation was performed correctly. Inadequate specimen preparation leads to potentially serious porous defects. The bonds produced were of good quality, at least as good as the parent material. |
published_date |
2022-10-21T04:20:37Z |
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1763754364449587200 |
score |
11.037603 |