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Related Experiment Video

Updated: May 24, 2026

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Assessment of deviatoric lattice strain uncertainty for polychromatic X-ray microdiffraction experiments.

Andrew Poshadel1, Paul Dawson, George Johnson

  • 1Sibley School of Mechanical and Aerospace Engineering, 196 Rhodes Hall, Cornell University, Ithaca, NY 14853, USA. acp42@cornell.edu

Journal of Synchrotron Radiation
|February 18, 2012
PubMed
Summary

X-ray microdiffraction offers high-resolution strain measurements but requires validation. This study quantifies its uncertainty, revealing variations across strain components and proposing methods to improve accuracy.

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Area of Science:

  • Materials Science
  • Physics
  • Crystallography

Background:

  • X-ray microdiffraction enables high-spatial-resolution lattice strain measurements.
  • Limited validation exists for this powerful technique, hindering its widespread adoption.
  • Understanding measurement uncertainty is crucial for reliable strain analysis.

Purpose of the Study:

  • To assess the uncertainty of deviatoric lattice strains measured by polychromatic X-ray microdiffraction.
  • To investigate the factors contributing to measurement uncertainty.
  • To propose methods for reducing uncertainty in lattice strain measurements.

Main Methods:

  • Experimental validation at the Advanced Light Source.
  • Polychromatic X-ray microdiffraction for lattice strain measurement.
  • Monte Carlo simulations to analyze measurement uncertainty and identify error sources.

Main Results:

  • Measurement uncertainty varies for each component of the deviatoric lattice strain tensor.
  • Spurious deformation modes contribute to erroneous strain calculations due to noise and limited data.
  • The study quantifies the uncertainty associated with deviatoric strain components.

Conclusions:

  • The validation experiment and simulations provide critical insights into X-ray microdiffraction uncertainty.
  • Understanding the origins of uncertainty, such as spurious modes, is key to improving strain analysis.
  • Proposed methods aim to enhance the reliability and accuracy of lattice strain measurements using X-ray microdiffraction.