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X-ray Crystallography02:18

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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Correlating Atom Probe Crystallographic Measurements with Transmission Kikuchi Diffraction Data.

Andrew J Breen1, Katharina Babinsky2, Alec C Day1

  • 11Australian Centre for Microscopy and Microanalysis,The University of Sydney,Sydney,NSW 2006,Australia.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|March 15, 2017
PubMed
Summary
This summary is machine-generated.

Correlative microscopy combining atom probe tomography (APT) and transmission Kikuchi diffraction (TKD) offers detailed insights into alloy microstructures. This study verifies APT

Keywords:
atom probe tomographycrystallographygrain boundarymisorientationtransmission Kikuchi diffraction

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Crystallography

Background:

  • Correlative microscopy combines techniques for enhanced analysis.
  • Atom Probe Tomography (APT) and Transmission Kikuchi Diffraction (TKD) are powerful but rarely combined.
  • Understanding alloy microstructures requires accurate crystallographic data.

Purpose of the Study:

  • To investigate the correlative application of APT and TKD on the same specimen.
  • To validate the accuracy of crystallographic measurements from APT using TKD.
  • To assess the impact of APT instrument type and experimental conditions on measurement accuracy.

Main Methods:

  • Correlative microscopy using APT and TKD on shared tip specimens.
  • Analysis of nanocrystalline Al-0.5Ag alloy and high-purity Mo specimens.
  • Comparison of crystallographic misorientation angles derived from APT reconstructions and TKD data.

Main Results:

  • The study presents the first independent verification of APT crystallographic accuracy using TKD.
  • Misorientation angle deviations between APT and TKD were found to be 0.7° and 1.4° for different specimens/configurations.
  • The type of APT instrument and experimental parameters influence the accuracy of crystallographic measurements.

Conclusions:

  • Combining APT and TKD provides a powerful approach for detailed microstructural analysis of engineering alloys.
  • Reconstruction and measurement procedures in APT can affect angular resolution and accuracy.
  • Further research is needed to optimize correlative workflows for improved crystallographic analysis.