Abstract
In order to clarify the atomic structure of deformation twin boundary in pure magnesium, 99.9 % purity magnesium single crystal was prepared by modified Bridgeman technique. Thin foils were thinned by a mechanical polishing, a mechanical gliding and ion-beam thinning. The microstructure and the atomic structure of the twin boundary of magnesium were observed by transmission electron microscopy (TEM) and high resolution TEM. In this study, all of the observed twins were lenticular {1012} twins with curved and straight regions. In both regions, it was found that these twin boundaries consisted of the symmetric tilt boundary planes and the (0001) faceted planes. The atomic structure of symmetric tilt boundary plane on these twins corresponded to the calculated atomic structure of {1012} twin boundary. It was also found that the curved region was a step-like structure and the straight region was a zig-zag structure.
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