✍ Scribed by Satoshi Hata; Kosuke Kimura; Hongye Gao; Syo Matsumura; Minoru Doi; Tomokazu Moritani; Jonathan S. Barnard; Jenna R. Tong; Jo H. Sharp; Paul A. Midgley
No coin nor oath required. For personal study only.
In the research field of phase transformations in alloys, three-dimensional microstructure evolution, in particular in ordering and phase-separation processes, remains as an unsolved issue. This is because that there has been no suitable experimental method for imaging ordered and phaseseparated domain structures in three dimensions. Although atom-probe microscopy and X-ray tomography are wellknown methods for imaging 3D microstructures in materials, they are not suitable for imaging microstructures of the ordered and phase-separated domains with domain sizes of about 10-500 nm. Therefore, computational works are mainly predominant in this research field. [1] Recently, the situation described above is changing. Electron tomography, that is, a combination of computed tomography (CT) and transmission or scanning transmission electron microscopy (TEM or STEM), has significantly developed and come into use for materials research. [2][3][4][5][6] In the case of a crystalline specimen, electron tomography was thought to be impossible. This is because electron diffraction in crystals violates the projection requirement, [3,4] by which the image intensity monotonically depends on the mass and thickness of the specimen. However, high-angle annular dark-field STEM (HAADF-STEM) and energy-filtered TEM (EFTEM) have made electron tomography possible
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The iron+zinc system has been investigated in the zinc-rich domain. Alloying of Fe and Zn in ZnCl 2 6ux allowed the formation of well-developed single crystals of phases Fe 13 Zn 39 and FeZn 10 in a one-step experiment. These phases crystallize in cubic space group I4 3m ( ) phase, Fe 13 Zn 39 , a