Abstract
Crystalline interfaces are of two basic types - interfaces in single phase solids separating grains of differing orientation (grain boundaries, sub-grain boundaries, twin boundaries), and interphase interfaces separating crystals which differ in crystal structure and/or composition, as well as relative orientation. Depending upon these variables a particular boundary will have more or less interfacial structure which can be resolved by transmission electron microscopy. The dislocations (line defects) which are imaged at boundaries by electron diffraction contrast effects may be unique to the boundary, i.e., have displacement vectors which are different from those of dislocations found in single phase materials. Analysis may be further complicated by extra diffraction effects such as superimposed Moire patterns (Fig. 1a and 2).
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More From: Proceedings, annual meeting, Electron Microscopy Society of America
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