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Published on: April 20, 2016
Three-Dimensional Imaging of Phase Ordering in an Fe-Al Alloy by Bragg Ptychography
Chan Kim1, Virginie Chamard2, Jörg Hallmann1
1European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany.
Abstract:
We show three-dimensional images of phase ordering in a Fe_{55}Al_{45} alloy obtained by coherent x-ray diffraction Bragg ptychography. Fe-Al alloys display ordered phases where the atoms organize on sublattices resulting in the emergence of otherwise forbidden superlattice reflections. The degeneracy of the ordering results in antiphase domain boundaries that, in addition to the general lattice strain, provide phase shifts of the diffracted beam depending on the reflection. The reconstructed phase images can be separated into components originating from B2 phase domains and lattice strain by performing Bragg ptychography on both the (002) fundamental and the (001) superlattice reflections.
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