Chuang, Yu-Chung (2024). Linear friction welding of Ti-5.3Al-7.7V-0.5Si to Ti-6Al-4V: processing, characterisation and mechanical behaviour. University of Birmingham. Ph.D.
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Chuang2024PhD.pdf
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Abstract
In the development of jet engines, where the reduction of component weight is paramount for improvement in efficiency, the choice of materials and manufacturing processes is critical. Titanium alloys, known for their high specific strength and excellent fatigue resistance, are well-suited materials for engine components in lower-temperature stages. Bladed discs (Blisks), offering a substantial weight reduction over the traditional mechanical assemblies, have become a standard component in jet engines, mainly as fan blisks. Linear friction welding (LFW) emerges as an ideal method for manufacturing blisks by joining blades and discs that are machined separately. LFW is capable of joining dissimilar materials, providing the opportunity to exploit different materials for discs and blades, given their exposure to different thermo-mechanical conditions in service. This research focuses on LFW of dissimilar titanium alloys: Ti-6Al-4V (Ti-64) and Ti-5.3Al-7.7V-0.5Si (Ti-575), with a particular emphasis on optimisation of processing, characterisation of microstructure and crystallographic texture, as well as assessment of mechanical performance. This work aims to enhance the understanding of LFW'd dissimilar joints for aerospace applications, specifically for blisks in the fan and compressor stages of next-generation jet engines.
The microstructure of the parent materials (PMs) and the welded joints was characterised by electron microscopy. Ti-575 parent was found to have superior hardness due to its fine secondary and tertiary
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
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| Award Type: | Doctorates > Ph.D. | |||||||||
| Supervisor(s): |
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Metallurgy and Materials | |||||||||
| Funders: | Engineering and Physical Sciences Research Council | |||||||||
| Subjects: | Q Science > Q Science (General) T Technology > T Technology (General) T Technology > TN Mining engineering. Metallurgy |
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| URI: | http://etheses.bham.ac.uk/id/eprint/15519 |
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