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  The role of molybdenum in suppressing cold dwell fatigue in titanium alloys

Ready, A. J., Haynes, P. D., Grabowski, B., Rugg, D., & Sutton, A. P. (2017). The role of molybdenum in suppressing cold dwell fatigue in titanium alloys. Proceedings of the Royal Society of London Series A-Mathematical Physical and Engineering Sciences, 473(2203): 20170189. doi:10.1098/rspa.2017.0189.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-64DC-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-64DD-6
Genre: Journal Article

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 Creators:
Ready, Adam J., Author
Haynes, Peter D., Author
Grabowski, Blazej1, Author              
Rugg, David, Author
Sutton, Adrian P., Author
Affiliations:
1Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863341              

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Free keywords: PERIODIC BOUNDARY-CONDITIONS; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; CRYSTAL PLASTICITY FE; AUGMENTED-WAVE METHOD; AB-INITIO; VACANCY FORMATION; ALPHA-TI; ULTRASOFT PSEUDOPOTENTIALS; DIFFUSION-COEFFICIENTSScience & Technology - Other Topics; cold dwell fatigue; Mo, Ti, density functional theory; point defects; hexagonal close-packed;
 Abstract: We test a hypothesis to explain why Ti-6242 is susceptible to cold dwell fatigue (CDF), whereas Ti-6246 is not. The hypothesis is that, in Ti-6246, substitutional Mo-atoms in alpha-Ti grains trap vacancies, thereby limiting creep relaxation. In Ti-6242, this creep relaxation enhances the loading of grains unfavourably oriented for slip and they subsequently fracture. Using density functional theory to calculate formation and binding energies between Mo-atoms and vacancies, we find no support for the hypothesis. In the light of this result, and experimental observations of the microstructures in these alloys, we agree with the recent suggestion (Qiu et al. 2014 Metall. Mater. Trans. A 45, 6075-6087. (doi:10.1007/s11661-014-2541-5)) that Ti-6246 has a much smaller susceptibility to CDF because it has a smaller grain size and a more homogeneous distribution of grain orientations. We propose that the reduction of the susceptibility to CDF of Ti-6242 at temperatures above about 200 degrees C is due to the activation of < c + a > slip in 'hard' grains, which reduces the loading of grain boundaries.

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Language(s): eng - English
 Dates: 20172017-07-01
 Publication Status: Published in print
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000408475000008
DOI: 10.1098/rspa.2017.0189
 Degree: -

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Title: Proceedings of the Royal Society of London Series A-Mathematical Physical and Engineering Sciences
  Other : Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Royal Society of London
Pages: - Volume / Issue: 473 (2203) Sequence Number: 20170189 Start / End Page: - Identifier: ISSN: 1364-5021
CoNE: https://pure.mpg.de/cone/journals/resource/954928604112_1