High resolution transmission electron microscope (HRTEM) image contrast of short-range order (SRO) in Ni4Mo alloys has been investigated by means of multi-slice simulations. The HRTEM image contrast of SRO in Ni4Mo coincides with a projection contrast of an SRO structure which involves D1a, D022 and Pt2Mo-type subunit cells in a disordered matrix. Multi-slice simulations revealed that the SRO structure exhibit a projection contrast in the HRTEM image when the fundamental fcc lattice reflections contribute sufficiently to HRTEM imaging. The results indicate that the image of SRO in Ni4Mo can be interpreted in terms of projected potential of atomic columns under an appropriate imaging condition.
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