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Related Experiment Video

Updated: May 24, 2025

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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Correlating Grain Boundary Character and Composition in 3-Dimensions Using 4D-Scanning Precession Electron

Saurabh M Das1, Patrick Harrison2, Srikakulapu Kiranbabu1

  • 1Max-Planck-Institut for Sustainable Materials (Max-Planck-Institut für Eisenforschung), Max-Planck-Straβe 1, 40237, Düsseldorf, Germany.

Small Methods
|February 28, 2025
PubMed
Summary

This study reveals how copper and silicon solutes selectively segregate to different types of grain boundaries (GBs) in nanocrystalline materials. Understanding this segregation is key to controlling material properties.

Keywords:
4D scanning precession electron diffraction tomography (4D‐SPEDT)atom probe tomography (APT)correlative 3D‐TEM/APTgrain boundary characternanocrystalline materialssegregation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Grain boundaries (GBs) are critical microstructural features in nanocrystalline materials.
  • Solute segregation to GBs significantly impacts material stability and properties.
  • GB character dictates the extent and location of solute segregation.

Purpose of the Study:

  • To develop a 3D correlative framework for analyzing GB character and composition.
  • To investigate the preferential segregation of Cu and Si in nanocrystalline Ni-W alloys.
  • To achieve sub-nanometer resolution for structure-chemistry correlations.

Main Methods:

  • Correlating 4D scanning precession electron diffraction tomography (4D-SPEDT) with atom probe tomography (APT).
  • Utilizing a 3D transmission electron microscopy and APT framework.
  • Analyzing the 3D grain boundary network and solute distribution.

Main Results:

  • Obtained the 3D GB habit plane network in a nanocrystalline Ni-W alloy.
  • Identified preferential segregation of Cu to high-angle and incoherent twin GBs.
  • Observed Si segregation to low-angle and incommensurate GBs.

Conclusions:

  • The developed 3D correlative approach enables high-resolution analysis of nanomaterials.
  • Provides fundamental insights into the 3D crystallographic and compositional nature of GBs.
  • Lays the groundwork for tailoring material properties through controlled solute segregation.