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The application of electron channeling techniques to the study of material response under cyclic loading conditions is providing some useful information on mechanisms from bulk specimens. Most of the effort thus far has been on examining the plastic zone parameters (size, shape, and strain distribution) but other useful information may be obtained as well (such as crystallographic interactions). Subcells may be observed directly in bulk specimens, and environmental effects may be studied. This paper reviews many of the details of the application of electron channeling to fatigue mechanism study, references results, and illustrates some of the concepts. A few of the possible future uses are also discussed.
aluminum alloys, crack propagation, electron channeling, electron diffraction contrast, fatigue fracture (materials), plastic properties, strain
Staff scientist, Southwest Research Institute, San Antonio, Tex.