Abstract
A transmission electron microscope study of the structures of grain boundaries in zinc has been performed. Dislocation structures are observed in many high angle boundaries, and in most cases, the boundaries that exhibit such structure are close in misorientation to a coincidence site lattice (CSL) forming misorientation. In some cases, the CSL can be formed exactly, by a simple rotation, as in the familiar cubic crystal cases, but this can only occur for rotations about the [0001] axis. For all other cases there must also be a slight constraint of the c/a ratio to some ideal value. Grain boundary structures are found to be related to constrained CSLs just as they are for exact CSLs in the more familiar cases. A serious complication for the analysis, however, is that the distribution of CSLs in misorientation space is very inhomogeneous for the HCP materials, so there are many candidate CSL systems for the analysis of any experimentally observed boundary.
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