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Dependence of the dislocation glide mode and mechanical twinning on the stacking fault energy (SFE) in fully austenitic high manganese steels was investigated. Fully austenitic Fe–22Mn–xAl–0.6C (x=0, 3, and 6) steels with the SFE in the range of 20–50mJ/m 2 were tensile tested at room temperature, and their deformed microstructures were examined at the different strain levels by optical microscopy...