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Open AccessArticle

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

Institute of Structural Materials, College of Engineering, Swansea University, SA1 8EN Swansea, UK
Timet UK, Holdford Road, Birmingham B6 7BJ, UK
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1200;
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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