Imperial College London
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ProfessorDavidDye

Faculty of Engineering, Department of Materials

Professor of Metallurgy
 
 
 
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Contact

 

+44 (0)20 7594 6811david.dye

 
 
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Location

 

1.09GoldsmithSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tong:2017:10.1111/jmi.12569,
author = {Tong, VS and Joseph, S and Ackerman, A and Dye and Britton},
doi = {10.1111/jmi.12569},
journal = {Journal of Microscopy},
pages = {318--329},
title = {Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy},
url = {http://dx.doi.org/10.1111/jmi.12569},
volume = {267},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Tong,VS
AU  - Joseph,S
AU  - Ackerman,A
AU  - Dye
AU  - Britton
DO  - 10.1111/jmi.12569
EP  - 329
PY  - 2017///
SN  - 1365-2818
SP  - 318
TI  - Using transmission Kikuchi diffraction to characterise α variants in an α+β titanium alloy
T2  - Journal of Microscopy
UR  - http://dx.doi.org/10.1111/jmi.12569
UR  - http://hdl.handle.net/10044/1/46022
VL  - 267
ER  -
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