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Updated: Mar 3, 2026

$Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction$

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

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

V Tong¹, S Joseph¹, A K Ackerman¹

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

Journal of Microscopy

|May 5, 2017

Summary

High-resolution electron microscopy reveals the nanostructure of two-phase titanium alloys like Ti-6242. This advanced analysis aids in understanding alloy performance for critical aerospace applications.

Keywords:

forescatter electron imaging metallurgy microscopy titanium transmission Kikuchi diffraction variant selection

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Published on: June 19, 2018

Area of Science:

Materials Science
Metallurgy
Nanotechnology

Background:

Two-phase titanium alloys are critical for high-performance components, especially in aeroengines.
Microstructure control (phase fractions, morphology, crystallographic orientations) is key during thermomechanical processing.
Ti-6242 alloys exhibit complex microstructures with primary, basketweave, and secondary alpha phases at different length scales.

Purpose of the Study:

To resolve and analyze the structures and crystallographic orientations of basketweave and secondary alpha phases in Ti-6242 alloys.
To investigate the alpha variants formed within a prior beta grain.
To test the validity of existing theories regarding phase transformation habit planes.

Main Methods:

Utilizing high spatial resolution transmission Kikuchi diffraction (TKD, also known as transmission-based electron backscatter diffraction, t-EBSD).
Employing scanning electron microscopy (SEM)-based forward scattering electron imaging.
Analyzing nanostructures within real-world engineering alloys.

Main Results:

Successfully resolved the fine-scale structures and orientations of basketweave and secondary alpha phases.
Analyzed alpha variant formation within a single prior beta grain.
Provided data to test existing phase transformation theories.

Conclusions:

Transmission techniques significantly increase spatial resolution for nanostructure analysis in engineering alloys.
SEM-based analysis with conventional EBSD and FSD imaging is effective for studying alloy nanostructures.
This research aids in optimizing thermomechanical processing and understanding the performance of bimodal two-phase titanium alloys, particularly in demanding applications like dwell fatigue.