Lattice Image Studies of Ordered Alloys

Lattice imaging is becoming a viable technique for investigating the structure, defects and early stages of phase transformations in ceramics and metals. Our interest lies in its application to the study of ordering in alloys. Conventional images yield little information on the local degree of order in the specimen, the image width of defects may be as great as 50Å, and the interpretation of diffaction patterns and superlattice dark field micrographs is sometimes ambiguous. The advantage of the lattice image is its ability to provide data about atomic environment (from the nature of the lattice fringe profile) and to reveal atomic arrangements near defects.