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Tong V, Joseph S, Ackerman AK, et al. Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy. J Microsc. 2017;267(3):318-329doi: 10.1111/jmi.12569.
Tong, V., Joseph, S., Ackerman, A. K., Dye, D., & Britton, T. B. (2017). Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy. Journal of microscopy, 267(3), 318-329. https://doi.org/10.1111/jmi.12569
Tong, V, et al. "Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy." Journal of microscopy vol. 267,3 (2017): 318-329. doi: https://doi.org/10.1111/jmi.12569
Tong V, Joseph S, Ackerman AK, Dye D, Britton TB. Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy. J Microsc. 2017 Sep;267(3):318-329. doi: 10.1111/jmi.12569. Epub 2017 May 04. PMID: 28470948; PMCID: PMC6849626.
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J Microsc. 2017 Sep;267(3):318-329. doi: 10.1111/jmi.12569. Epub 2017 May 04.

Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy.

Journal of microscopy

V Tong, S Joseph, A K Ackerman, D Dye, T B Britton

Affiliations

  1. Department of Materials, Royal School of Mines, Imperial College London, Kensington, London, SW7 2AZ, UK.

PMID: 28470948 PMCID: PMC6849626 DOI: 10.1111/jmi.12569

Abstract

Two phase titanium alloys are important for high-performance engineering components, such as aeroengine discs. The microstructures of these alloys are tailored during thermomechanical processing to precisely control phase fractions, morphology and crystallographic orientations. In bimodal two phase (α + β) Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) alloys there are often three microstructural lengthscales to consider: large (∼10 μm) equiaxed primary α; >200 nm thick plate α with a basketweave morphology; and very fine scaled (<50 nm plate thickness) secondary α that grows between the larger α plates surrounded by retained β. In this work, we utilise high spatial resolution transmission Kikuchi diffraction (TKD, also known as transmission-based electron backscatter diffraction, t-EBSD) and scanning electron microscopy (SEM)-based forward scattering electron imaging to resolve the structures and orientations of basketweave and secondary α in Ti-6242. We analyse the α variants formed within one prior β grain, and test whether existing theories of habit planes of the phase transformation are upheld. Our analysis is important in understanding both the thermomechanical processing strategy of new bimodal two-phase titanium alloys, as well as the ultimate performance of these alloys in complex loading regimes such as dwell fatigue. Our paper champions the significant increase in spatial resolution afforded using transmission techniques, combined with the ease of SEM-based analysis using conventional electron backscatter diffraction (EBSD) systems and forescatter detector (FSD) imaging, to study the nanostructure of real-world engineering alloys.

© 2017 The Authors. Journal of Microscopy published by JohnWiley & Sons Ltd on behalf of Royal Microscopical Society.

Keywords: forescatter electron imaging; metallurgy; microscopy; titanium; transmission Kikuchi diffraction; variant selection

References

  1. J Microsc. 2009 Mar;233(3):451-9 - PubMed
  2. IUCrJ. 2015 Jan 01;2(Pt 1):126-36 - PubMed
  3. Ultramicroscopy. 2011 Aug-Oct;111(9-10):1488-94 - PubMed
  4. Ultramicroscopy. 2015 Aug;155:62-73 - PubMed
  5. Ultramicroscopy. 2007 Apr-May;107(4-5):414-21 - PubMed
  6. Ultramicroscopy. 2007 Feb-Mar;107(2-3):254-66 - PubMed
  7. J Microsc. 1999 Sep;195(3):212-216 - PubMed
  8. Ultramicroscopy. 2013 Feb;125:66-71 - PubMed
  9. J Microsc. 2013 Apr;250(1):1-14 - PubMed

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