Abstract
The short range ordered (SRO) structure in Ni 4Mo has been investigated by means of high resolution transmission electron microscopy with digital image processing and Monte Carlo simulation. High resolution transmission electron microscope (HRTEM) images were recorded with an Imaging Plate (IP) system. Conventionally printed images of the SRO state exhibit locally dot patterns corresponding to N 2M 2-type (chalcopyrite-like) structure. However, the dot patterns transform into those of subunit cell clusters of D1 a, D0 22 and Pt 2Mo structures, when the image is output with a different gray scale. The Monte Carlo simulation with appropriate interaction parameters of atoms has explained successfully the HRTEM images. It is concluded that the SRO state in Ni 4Mo involves subunit cell clusters of D1 a, D0 22 and Pt 2Mo structures in the atomistic level of microstructure. The concept of 〈1 1/2 0〉* static concentration waves corresponding to the N 2M 2 pattern is rationalized as a mesoscopically averaging view of the SRO state.
Published Version
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