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Observation of structural anisotropy in metallic glasses induced by mechanical deformation

Published online by Cambridge University Press:  03 March 2011

Wojtek Dmowski  and
Takeshi Egami
Wojtek Dmowski*
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200
Takeshi Egami
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200; and Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6376
*
a) Address all correspondence to this author. e-mail: wdmowski@utk.edu
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Abstract

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.

Keywords

AmorphousMetalX-ray defraction (XRD)

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Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 412 - 418
Copyright
Copyright © Materials Research Society 2007

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References

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