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Modeling and Numerical Simulations of Microdiffraction from Deformed Crystals

Published online by Cambridge University Press:  01 February 2011

R.I. Barabash,
G.E. Ice and
F.J. Walker
R.I. Barabash
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge TN 37831-6118
G.E. Ice
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge TN 37831-6118
F.J. Walker
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge TN 37831-6118
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Abstract

Brilliant synchrotron microprobes offer new opportunities for the analysis of stress/strain and deformation distributions in crystalline materials. Polychromatic x-ray microdiffraction is emerging as a particularly important tool because it allows for local crystal-structure measurements in highly deformed or polycrystalline materials where sample rotations complicate alternative methods; a complete Laue pattern is generated in each volume element intercepted by the probe beam. Although a straightforward approach to the measurement of stress/strain fields through white-beam Laue microdiffraction has been demonstrated, a comparable method for determining the plastic-deformation tensor has not been established. Here we report on modeling efforts that can guide automated fitting of plastic-deformation-tensor distributions in three dimensions.

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