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Analysis of recrystallized volume fractions in uranium using electron backscatter diffraction.

Rodney J McCabe1, David F Teter

  • 1Materials Science and Technology Division, Mail Stop G770, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. rmccabe@lanl.gov

Journal of Microscopy
|July 29, 2006
PubMed
Summary

A new method using electron backscatter diffraction accurately measures uranium recrystallization. This technique differentiates between recrystallized and unrecrystallized fractions, offering texture insights beyond traditional hardness tests.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Nuclear Materials

Background:

  • Recrystallization is crucial for understanding material properties after deformation.
  • Accurate quantification of recrystallized fractions in uranium is essential for nuclear applications.
  • Existing methods for assessing recrystallization have limitations in accuracy and information provided.

Purpose of the Study:

  • To develop and validate a new method for examining uranium recrystallization behavior.
  • To improve the accuracy of recrystallized fraction estimation in uranium.
  • To incorporate texture analysis into the assessment of recrystallized uranium.

Main Methods:

  • Electron backscatter diffraction (EBD) was employed to analyze warm, clock-rolled uranium specimens.

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  • A novel uranium specimen preparation technique was established to achieve consistent surface finishes.
  • Grain average misorientation (GAM) was utilized to distinguish between recrystallized and unrecrystallized fractions.

    • Main Results:

    • The new preparation method consistently yielded acceptable surface finishes for uranium specimens.
    • Electron backscatter diffraction effectively differentiated recrystallized from unrecrystallized fractions based on GAM.
    • The EBD-based GAM approach provided a more accurate recrystallized fraction estimate compared to hardness measurements.

    Conclusions:

    • Electron backscatter diffraction offers a superior method for quantifying uranium recrystallization.
    • The developed technique provides valuable texture information, enhancing material characterization.
    • This approach represents a significant advancement over conventional metallographic and hardness testing methods for uranium.