The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium
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 $$\langle$$a$$\rangle$$ and bas $$\langle$$a$$\rangle$$ 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.
- Authors:
-
[1];
[2];
[3];
[1];
[1]
- Imperial College, London (United Kingdom)
- Pennsylvania State University, University Park, PA (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Rolls-Royce plc., Derby (United Kingdom)++
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); Rolls-Royce plc; EPSRC Centre for Doctoral Training; Hexmat EPSRC program; Engineering and Physical Sciences Research Council; USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
- OSTI Identifier:
- 1893582
- Report Number(s):
- LLNL-JRNL-835496
Journal ID: ISSN 2041-1723; 1054523
- Grant/Contract Number:
- AC52-07NA27344; EP/L015277/1; EP/K034332/1; EP/R018863/1; DMR-1829070
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; titanium alloys; plasticity; slip avalanche
Citation Formats
Worsnop, Felicity F., Lim, Rachel E., Bernier, Joel V., Pagan, Darren C., Xu, Yilun, McAuliffe, Thomas P., Rugg, David, and Dye, David. The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium. United States: N. p., 2022.
Web. doi:10.1038/s41467-022-33437-z.
Worsnop, Felicity F., Lim, Rachel E., Bernier, Joel V., Pagan, Darren C., Xu, Yilun, McAuliffe, Thomas P., Rugg, David, & Dye, David. The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium. United States. https://doi.org/10.1038/s41467-022-33437-z
Worsnop, Felicity F., Lim, Rachel E., Bernier, Joel V., Pagan, Darren C., Xu, Yilun, McAuliffe, Thomas P., Rugg, David, and Dye, David. Mon .
"The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium". United States. https://doi.org/10.1038/s41467-022-33437-z. https://www.osti.gov/servlets/purl/1893582.
@article{osti_1893582,
title = {The influence of alloying on slip intermittency and the implications for dwell fatigue in titanium},
author = {Worsnop, Felicity F. and Lim, Rachel E. and Bernier, Joel V. and Pagan, Darren C. and Xu, Yilun and McAuliffe, Thomas P. and Rugg, David and Dye, David},
abstractNote = {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 $\langle$a$\rangle$ and bas $\langle$a$\rangle$ 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.},
doi = {10.1038/s41467-022-33437-z},
journal = {Nature Communications},
number = 1,
volume = 13,
place = {United States},
year = {Mon Oct 10 00:00:00 EDT 2022},
month = {Mon Oct 10 00:00:00 EDT 2022}
}
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