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1 results

  • Observation of structural anisotropy in metallic glasses induced by mechanical deformation

  • Wojtek Dmowski, Takeshi Egami
  • Journal:
    Journal of Materials Research / Volume 22 / Issue 2 / September 2006
    Published online by Cambridge University Press:
    03 March 2011, pp. 412-418
    Print publication:
    September 2006

  • We have investigated atomic structure of a Fe81B13Si4C2 metallic glass after mechanical creep deformation. We determined the structure function and pair density function resolved for azimuthal angle using x-ray scattering and a two-dimensional detector. The results are analyzed by the spherical harmonics expansion, and are compared to the often-used simple analysis of the anisotropic pair density function determined by measuring the structure function along two directions with respect to the stress. We observed uniaxial structural anisotropy in a sample deformed during creep experiment. The observed macroscopic shear strain is explained in terms of local bond anisotropy induced by deformation at elevated temperature. The bond anisotropy is a “memory” of this deformation after load was removed. We showed that use of sine-Fourier transformation to anisotropic glass results in systematic errors in the atomic pair distribution function.