The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium

Felicity F. Worsnop (), Rachel E. Lim, Joel V. Bernier, Darren C. Pagan, Yilun Xu, Thomas P. McAuliffe, David Rugg and David Dye ()
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Felicity F. Worsnop: Imperial College London
Rachel E. Lim: Pennsylvania State University
Joel V. Bernier: Lawrence Livermore National Laboratory
Darren C. Pagan: Pennsylvania State University
Yilun Xu: Imperial College London
Thomas P. McAuliffe: Imperial College London
David Rugg: Formerly with Rolls-Royce plc.
David Dye: Imperial College London

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Dwell fatigue, the reduction in fatigue life experienced by titanium alloys due to holds at stresses as low as 60% of yield, has been implicated in several uncontained jet engine failures. Dislocation slip has long been observed to be an intermittent, scale-bridging phenomenon, similar to that seen in earthquakes but at the nanoscale, leading to the speculation that large stress bursts might promote the initial opening of a crack. Here we observe such stress bursts at the scale of individual grains in situ, using high energy X-ray diffraction microscopy in Ti–7Al–O alloys. This shows that the detrimental effect of precipitation of ordered Ti3Al is to increase the magnitude of rare pri〈a〉 and bas〈a〉 slip bursts associated with slip localisation. By contrast, the addition of trace O interstitials is beneficial, reducing the magnitude of slip bursts and promoting a higher frequency of smaller events. This is further evidence that the formation of long paths for easy basal plane slip localisation should be avoided when engineering titanium alloys against dwell fatigue.

Date: 2022
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DOI: 10.1038/s41467-022-33437-z

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