Abstract
Microcrack initiation and propagation in mechanical fatigued polycrystals are sensitive to crystallographic misorientation between grains. The analysis of factors affecting the propagation of microcracks requires quantitative knowledge about the crystallographic misorientations of the grain boundary segments in which microcracks have been observed. Such observations are possible using the electron back-scattering pattern technique in the scanning electron microscope. The principle of this method is explained and some examples of such investigations on nickel polycrystals in push-pull tests are presented.
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