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Open AccessArticle

Microstructural Control of Fatigue Behaviour in a Novel  Titanium Alloy

1
Institute of Structural Materials, College of Engineering, Swansea University, SA1 8EN Swansea, UK
2
Timet UK, Holdford Road, Birmingham B6 7BJ, UK
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1200; https://doi.org/10.3390/met9111200
Received: 1 October 2019 / Revised: 24 October 2019 / Accepted: 31 October 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Titanium Alloys: Processing and Properties)
The novel titanium alloy TIMETAL® 407 (Ti-407) has been developed as an alternative to Ti-6Al-4V (Ti-6-4), for applications that demand relatively high ductility and energy absorption. Demonstrating a combination of lower strength and greater ductility, the alloy introduces a variety of cost reduction opportunities, including improved machinability. Thermo-mechanical processing and its effects on microstructure and subsequent mechanical performance are characterised, including a detailed assessment of the fatigue and crack propagation properties. Demonstrating relatively strong behaviour under high-cycle fatigue loading, Ti-407 is nevertheless susceptible to time-dependent fatigue effects. Its sensitivity to dwell loading is quantified, and the associated deformation and fracture mechanisms responsible for controlling fatigue life are explored. The intimate relationship between thermo-mechanical processing, micro-texture and fatigue crack initiation through the generation of quasi-cleavage facets is highlighted. Consistent fatigue crack growth kinetics are demonstrated, independent of local microstructure.
Keywords: Ti-407; dwell sensitive fatigue; quasi-cleavage facets; micro-texture; macro-zones; Ti-407; dwell sensitive fatigue; quasi-cleavage facets; micro-texture; macro-zones;
MDPI and ACS Style

Bache, M.; Davies, H.; Davey, W.; Thomas, M.; Berment-Parr, I. Microstructural Control of Fatigue Behaviour in a Novel  Titanium Alloy. Metals 2019, 9, 1200.

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