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2D and 3D X-Ray Structural Microscopy Using Submicron-Resolution Laue Microdiffraction

Published online by Cambridge University Press:  01 February 2011

John D. Budai ,
Wenge Yang ,
Bennett C. Larson ,
Jonathan Z. Tischler ,
Wenjun Liu  and
Gene E. Ice
John D. Budai
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory
Wenge Yang
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory
Bennett C. Larson
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory
Jonathan Z. Tischler
Affiliation:
Condensed Matter Sciences Division, Oak Ridge National Laboratory
Wenjun Liu
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831–6030, U.S.A.
Gene E. Ice
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory Oak Ridge, TN 37831–6030, U.S.A.
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Abstract

We have developed a scanning, polychromatic x-ray microscopy technique with submicron spatial resolution at the Advanced Photon Source. In this technique, white undulator radiation is focused to submicron diameter using elliptical mirrors. Laue diffraction patterns scattered from the sample are collected with an area detector and then analyzed to obtain the local crystal structure, lattice orientation, and strain tensor. These new microdiffraction capabilities have enabled both 2D and 3D structural studies of materials on mesoscopic length-scales of tenths-to-hundreds of microns. For thin samples such as deposited films, 2D structural maps are obtained by step-scanning the area of interest. For example, 2D x-ray microscopy has been applied in studies of the epitaxial growth of oxide films. For bulk samples, a 3D differential-aperture x-ray microscopy technique has been developed that yields the full diffraction information from each submicron volume element. The capabilities of 3D x-ray microscopy are demonstrated here with measurements of grain orientations and grain boundary motion in polycrystalline aluminum during 3D thermal grain growth. X-ray microscopy provides the needed, direct link between the experimentally measured 3D microstructural evolution and the results of theory and modeling of materials processes on mesoscopic length scales.

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References

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