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3 results

  • Medium-Range Order in High Al-content Amorphous Alloys Measured by Fluctuation Electron Microscopy

  • W. G. Stratton, J. Hamann, J. H. Perepezko, P. M. Voyles
  • Journal:
    MRS Online Proceedings Library Archive / Volume 806 / 2003
    Published online by Cambridge University Press:
    01 February 2011, MM9.4
    Print publication:
    2003

  • We have used fluctuation electron microscopy (FEM) to measure nanoscale mediumrange order in amorphous Al92Sm8. Samples of this amorphous alloy formed by rapid quenching (melt-spinning) show a high density of pure Al nanocrystals (>1020 m-3) after low temperature (< 250 °C) devitrification. In samples amorphized by deformation (cold-rolling), primary Al-crystallization does not occur. This difference in devitrification behavior suggests an underlying structural difference in the amorphous state. FEM is a quantitative microscopy technique for determining nanoscale medium-range order in amorphous materials. Our measurements show that amorphous alloys formed by melt-spinning and cold-rolling have significant structural differences, and that annealing melt-spun alloy under conditions previously shown to modify the devitrification thermodynamics also changes the medium-range structure.