High integrity joining and Repair of Gamma Titanium Aluminides

Fitzgerald, Paul

doi:10.23889/SUthesis.61651

E-Thesis 292 views

High integrity joining and Repair of Gamma Titanium Aluminides / Paul Fitzgerald

Swansea University Author: Paul Fitzgerald

E-Thesis – open access under embargo until: 21st October 2027

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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Published:	Swansea 2022
Institution:	Swansea University
Degree level:	Doctoral
Degree name:	EngD
Supervisor:	Brown, Steven
URI:	https://cronfa.swan.ac.uk/Record/cronfa61651
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first_indexed	2022-10-24T15:27:35Z
last_indexed	2023-01-13T19:22:32Z
id	cronfa61651
recordtype	RisThesis
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spelling	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
format	E-Thesis
publishDate	2022
institution	Swansea University
doi_str_mv	10.23889/SUthesis.61651
college_str	Faculty of Science and Engineering
hierarchytype
hierarchy_top_id	facultyofscienceandengineering
hierarchy_top_title	Faculty of Science and Engineering
hierarchy_parent_id	facultyofscienceandengineering
hierarchy_parent_title	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
document_store_str	0
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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
_version_	1763754364449587200
score	11.012678

High integrity joining and Repair of Gamma Titanium Aluminides / Paul Fitzgerald

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