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The erosion of titanium aluminide intermetallic alloys
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Centre for Materials Engineering
2016
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| _version_ | 1867613284425793536 |
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| access_status_str | Open Access |
| author | Howard, Robert Llewellyn |
| author2 | Ball, Anthony |
| author_browse | Ball, Anthony Howard, Robert Llewellyn |
| author_facet | Ball, Anthony Howard, Robert Llewellyn |
| author_sort | Howard, Robert Llewellyn |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/17434 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:41.762Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Centre for Materials Engineering |
| publisherStr | Centre for Materials Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/17434 The erosion of titanium aluminide intermetallic alloys Howard, Robert Llewellyn Ball, Anthony Lang, Candy Materials Engineering Includes bibliographical references. The erosion behaviour of titanium aluminide intermetallic alloys has not been widely reported in the scientific literature and is part of the current international research effort aimed at exploiting these materials for turbine engine and automotive applications. In the present study titanium aluminides have been subjected to both solid particle erosion and cavitation erosion. The erosion rates have been measured and the damage mechanisms have been identified and discussed in terms of the microstructures and mechanical properties of the titanium aluminide alloys. This has been achieved with a variety of investigative techniques, including electron microscopy, mechanical testing and microstructural examination; and, where necessary, the erosion performance of other materials have been evaluated for comparison. In particle erosion, conducted with air blast rigs at room temperature and at elevated temperature, the titanium aluminide alloys exhibit a ductile mode of material removal, and their limited strain to fracture results in higher particle erosion rates than those for 304 stainless steel. Heat treatment to produce changes in microstructure and hardness does not significantly affect particle erosion performance, and elevated temperature tests reveal an increase in particle erosion rate with increasing temperature. In cavitation erosion, the titanium aluminide alloys exhibit a ductile mode of damage accumulation and material loss, and the rates of material loss are lower than those for other engineering materials such as 304 stainless steel and some hardmetal grades which are currently used in erosive environments. The mechanism of cavitation erosion of the Ti₃Al-based alloy involves the accumulation of strain in phase boundary regions and the preferential removal of the more brittle component of the microstructure. For the Ti₃Al-based alloy, cavitation erosion resistance increases with an increase in hardness produced by heat treatment. The TiAl-based alloys exhibit twinning during the initial stages of cavitation, which is characteristic of the high strain rate deformation of TiAl-based alloys, followed by substantial work hardening and preferential material loss from phase interfaces and twinned regions. 2016-03-04T16:31:45Z 2016-03-04T16:31:45Z 1995 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/17434 eng application/pdf Centre for Materials Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Materials Engineering Howard, Robert Llewellyn The erosion of titanium aluminide intermetallic alloys |
| thesis_degree_str | Doctoral |
| title | The erosion of titanium aluminide intermetallic alloys |
| title_full | The erosion of titanium aluminide intermetallic alloys |
| title_fullStr | The erosion of titanium aluminide intermetallic alloys |
| title_full_unstemmed | The erosion of titanium aluminide intermetallic alloys |
| title_short | The erosion of titanium aluminide intermetallic alloys |
| title_sort | erosion of titanium aluminide intermetallic alloys |
| topic | Materials Engineering |
| url | http://hdl.handle.net/11427/17434 |
| work_keys_str_mv | AT howardrobertllewellyn theerosionoftitaniumaluminideintermetallicalloys AT howardrobertllewellyn erosionoftitaniumaluminideintermetallicalloys |