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Phase identification of microfeatures using EPMA methods, especially high-resolution X-ray spectroscopy

Love1, Scott

  • 1Department of Materials Science and Engineering, University of Bath, BA2 7AY, Bath, UK.

Micron (Oxford, England : 1993)
|August 11, 2000
PubMed
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Electron-probe microanalysis revealed chemical reactions between magnesium alloy and silicon carbide fibers during composite manufacturing. This resulted in fiber degradation and the formation of new compounds in the metal matrix.

Area of Science:

  • Materials Science
  • Metallurgy
  • Nanomaterials

Background:

  • Magnesium alloy composites offer advanced material properties.
  • Understanding interfacial reactions is crucial for composite performance.
  • Silicon carbide fibers are used for reinforcement.

Purpose of the Study:

  • To identify micro-scale constituents and interfacial reactions in a magnesium alloy-silicon carbide composite.
  • To investigate the chemical changes occurring in silicon carbide fibers during composite manufacturing.
  • To characterize the phases formed in the metal matrix.

Main Methods:

  • Electron-probe microanalysis (EPMA) for elemental composition and phase identification.
  • Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) for microstructural analysis.

Related Experiment Videos

  • X-ray line analysis to determine chemical reaction pathways.

    • Main Results:

    • SEM revealed chemical attack on silicon carbide fibers, forming distinct reaction zones and oxidized fibers.
    • EPMA showed magnesium penetration into fibers, accompanied by silicon and carbon reduction, indicating reaction with silicon oxycarbide.
    • Aluminium in the alloy formed aluminum carbide and Mg-Al intermetallic with fiber constituents.
    • Black fibers exhibited severe oxidation, while the matrix contained magnesium/aluminum oxide, silicon carbide, and magnesium silicide particles.

    Conclusions:

    • The study elucidates the complex interfacial chemistry during magnesium alloy composite fabrication.
    • Magnesium and aluminum react with silicon carbide fibers, leading to degradation and formation of new phases.
    • Understanding these reactions is vital for optimizing composite processing and properties.