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Related Experiment Videos

Quantitative analytical electron microscopy of multiphase alloys.

J Prybylowski1, R Ballinger, C Elliott

  • 1General Electric Company, Schenectady, New York 12301.

Journal of Electron Microscopy Technique
|February 1, 1989
PubMed
Summary

This study introduces a new method for analyzing composition gradients in alloys using an analytical electron microscope. The technique effectively measures chromium concentration gradients at grain boundaries in nickel-base superalloys.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Analytical Chemistry

Background:

  • Analyzing composition gradients in multi-phase alloys is challenging, especially when second-phase particles are similar in size to the electron microscope's irradiated volume.
  • Large compositional differences between phases can obscure underlying gradients within the primary phase due to fluctuating phase fractions.

Purpose of the Study:

  • To develop and present a novel analytical technique for accurately determining composition gradients within the primary phase of two-phase alloys.
  • To address the issue of masked composition gradients caused by large phase fraction variations in electron microscopy analysis.

Main Methods:

  • Utilized an analytical electron microscope to probe composition gradients.
  • Developed a specific analysis technique to differentiate between phase fraction fluctuations and true composition gradients.

Related Experiment Videos

  • Applied the technique to a nickel-base superalloy (Alloy X-750) to measure grain boundary chromium concentration gradients.

    • Main Results:

    • Successfully determined grain boundary chromium concentration gradients in Alloy X-750.
    • Demonstrated the technique's ability to resolve composition gradients despite challenges posed by particle size and phase fraction variations.
    • Validated the effectiveness of the developed analysis method.

    Conclusions:

    • The presented technique provides a reliable method for analyzing composition gradients in alloys where second-phase particle size is comparable to the irradiated volume.
    • This method is particularly useful for systems with significant compositional differences between phases, such as nickel-base superalloys.
    • The technique holds potential for application in various other alloy systems requiring detailed compositional analysis.