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Related Experiment Videos

A laboratory based system for laue micro x-ray diffraction.

P A Lynch1, A W Stevenson, D Liang

  • 1Commonwealth Scientific and Industrial Research Organization, Manufacturing and Infrastructure Technology, Private Bag 33, Clayton South MDC, 3169, Australia. Peter.Lynch@csiro.au

The Review of Scientific Instruments
|June 21, 2007
PubMed
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A new micro-x-ray diffraction system analyzes individual grains in polycrystalline materials. This system maps grain orientation and strain, revealing significant changes after tensile loading in a magnesium alloy.

Area of Science:

  • Materials Science
  • Crystallography
  • Analytical Chemistry

Background:

  • Studying individual grain behavior in polycrystalline materials is crucial for understanding material properties.
  • Traditional diffraction methods often lack the resolution to analyze single grains within a complex matrix.

Purpose of the Study:

  • To develop and characterize a laboratory-based micro-x-ray diffraction system for single-grain analysis.
  • To demonstrate the system's capability in mapping grain orientation and deviatoric strain.
  • To investigate the effects of tensile loading on grain behavior in a magnesium alloy.

Main Methods:

  • Development of a micro-x-ray diffraction system using a microfocus x-ray source and monocapillary optic, achieving a 10 micrometer beam.
  • Characterization of the beam profile, divergence (14 mrad), and energy bandpass (5.5–19 keV) using the knife-edge method.

Related Experiment Videos

  • Application of Laue indexing software (X-Ray Micro-Diffraction Analysis Software) for orientation and strain analysis of single grains.

    • Main Results:

    • The system successfully mapped grain orientation and deviatoric strain in a polycrystalline magnesium alloy (Mg 0.2 wt % Nd).
    • An initial basal (0002) orientation was observed in the as-rolled annealed alloy.
    • Post-tensile loading, some grains exhibited a significant orientation change (up to 30 degrees from basal) and increased deviatoric tensile strain parallel to the load axis.

    Conclusions:

    • The developed micro-x-ray diffraction system is effective for analyzing single-grain behavior in polycrystalline materials.
    • Tensile loading induces substantial changes in grain orientation and strain distribution, impacting material performance.
    • This technique provides valuable insights into the mechanical response of individual grains within alloys.