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Dislocations with a large edge component do not exhibit a full loss of di raction contrast in the transmission electron microscope unless the conditions g· bˆ0 and g· b uˆ0 are simultaneously met. Because of a similarity between transmission electron microscopy (TEM) di raction contrast and electron channelling contrast in the scanning electron microscope, the same contrast rules would be expected to apply for electron channelling contrast imaging (ECCI). Using the characteristic edge dislocations formed in annealed FeAl, it is demonstrated that the same extinction conditions apply for TEM di raction contrast and ECCI.

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