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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Correlative Site-Specific Sample Preparation for Atom Probe Tomography on Complex Microstructures.

Lucía Paula Campo Schneider1, Jenifer Barrirero1, Christoph Pauly1

  • 1Department of Materials Science and Engineering, Saarland University, Campus D 3.3, D-66123Saarbrücken, Germany.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|June 3, 2021
PubMed
Summary
This summary is machine-generated.

Preparing site-specific specimens for atom probe tomography (APT) is challenging. This study introduces a new method combining electron diffraction and APT for martensitic steels, improving accuracy and efficiency in analyzing microstructures.

Keywords:
atom probe tomographycorrelative microscopygrain boundary analysismartensitic steelstransmission Kikuchi diffraction

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Microscopy

Background:

  • Site-specific specimen preparation for atom probe tomography (APT) is crucial but challenging.
  • Current methods for complex microstructures can be time-consuming and lack precision.
  • Correlative microscopy aids target preparation and provides complementary material information.

Purpose of the Study:

  • To develop an efficient methodology for studying grain boundaries and interfaces in martensitic steels using APT.
  • To improve the accuracy of site-specific extraction for microstructural analysis.
  • To present a novel sample holder enabling in-situ analysis during preparation.

Main Methods:

  • Integration of electron backscattered diffraction (EBD), transmission Kikuchi diffraction (TKD), and APT.
  • Development of a specialized sample holder for in-situ TKD and scanning transmission electron microscopy (STEM).
  • Focused ion beam (FIB) milling and plasma cleaning for specimen preparation and contamination mitigation.

Main Results:

  • Successful tracing of a prior austenite grain boundary from bulk material to the APT specimen apex.
  • Demonstration of a combined EBD, TKD, and APT workflow for martensitic steel microstructural analysis.
  • Evaluation of electron beam-induced contamination and the effectiveness of plasma cleaning.

Conclusions:

  • The presented methodology enhances the precision and efficiency of site-specific APT analysis in martensitic steels.
  • The novel sample holder facilitates correlative microscopy during specimen preparation, reducing workflow complexity.
  • This approach offers a robust strategy for investigating grain boundaries and interfaces at the nanoscale.