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Updated: Feb 26, 2026

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Microstructural evolution during sintering of copper particles studied by laboratory diffraction contrast tomography

S A McDonald1, C Holzner2, E M Lauridsen3

  • 1Henry Moseley X-ray Imaging Facility, School of Materials, University of Manchester, Manchester, M13 9PL, UK. sam.mcdonald@manchester.ac.uk.

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|July 14, 2017
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Summary
This summary is machine-generated.

This study reveals how particle rotation and grain growth drive powder sintering. Advanced imaging shows surface particles rotate more, influencing material densification during heating.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Crystallography

Background:

  • Powder sintering involves particle rearrangement, rotation, deformation, diffusion, and grain growth.
  • The precise contribution of each mechanism to densification remains unclear.

Purpose of the Study:

  • To non-destructively investigate and differentiate the mechanisms of powder sintering in three dimensions.
  • To quantify particle rotation and grain growth kinetics during sintering.

Main Methods:

  • Coupling laboratory diffraction contrast tomography (LabDCT) with conventional computed tomography (CT) in a time-lapse study.
  • Sintering a copper powder sample at 1050°C.
  • Utilizing LabDCT for crystallographic imaging and CT for morphological changes.

Main Results:

  • Observed and differentiated particle rearrangement, rotation, diffusion, deformation, and grain growth during sintering.
  • Quantified particle rotation accuracy to <0.05°, noting lower rotation rates for highly coordinated particles.
  • Tracked individual grain growth/shrinkage kinetics, observing rapid abnormal grain growth in one instance.

Conclusions:

  • Demonstrated a novel method for in-situ, 3D observation of sintering mechanisms.
  • Provided quantitative data on particle rotation and grain growth, advancing understanding of powder densification.
  • Highlighted the varying roles of different particles and grains in the sintering process.