Lattice imaging of the B19 ordering transformation and interfacial structures in Mg3Cd

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Abstract

The later stages of B19 ordering in Mg3Cd have been investigated by direct lattice imaging. Unit cell high steps (5.3 Å) have been clearly resolved in the following interfaces: the order-disorder interface; translational antiphase boundaries and rotational domain boundaries. These observations are thought to indicate a ledge mechanism for ordering and domain growth. Lattice imaging and corresponding optical diffraction have also been used for phase identification and determination of unit cell dimensions. In addition, the characteristic domain structure of the B19 phase has been studied in detail, and the unusual multiple domain junctions are explained in terms of the orthorhombic lattice distortion upon transformation. Considerably more information has been discovered by lattice imaging than is possible by conventional electron microscopy. © 1977.

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Sinclair, R., & Dutkiewicz, J. (1977). Lattice imaging of the B19 ordering transformation and interfacial structures in Mg3Cd. Acta Metallurgica, 25(3), 235–249. https://doi.org/10.1016/0001-6160(77)90142-0

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