Abstract
The mechanical response of two grades of the fully austenitic high Mn steel (Fe-22Mn-0.6C (0 Al steel) and Fe-22Mn-6Al-0.6C (6 Al steel)) was examined under quasi-static and dynamic loading, mainly focusing on the effects of Al addition. For bothloading condition, Al increased yield strength but decreased strain hardenability. The Al addition was found to suppress mechanical twinning by increasing the austenite stability (i.e. increasing the stacking fault energy). Therefore, twinning induced plasticity dominates plastic deformation of the 0 Al steel while that of the 6 Al steel is governed by planar glide.
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