Abstract 
	In the automotive industry significant process has been achieved concerning safety and fuel economy. New types of materials are used in the vehicles to assure higher parameters High manganese materials form perspective generation of ductile high strength alloy. Extraordinary mechanical properties of these alloys named FeMnTWIP1100 (twinning induced plasticity) basically come from two main features: a) material is fully formed with the FCC structure at all considered temperatures? b) twinning is the main deformation mechanism. The FeMnTWIP alloys possess low stacking fault energy (SFE) leading to the possibility of multiple simultaneous and/or sequential deformation mechanisms. In addition to dislocation slip, both mechanism twinning and ?-martensite formation are concurrent deformation mechanisms linked to the stacking fault energy. The critical boundary value of those parameters is 18mJm-2. At the stacking fault energy level, being higher than presented critical value (around 20 ? 25mJm-2 usually) ?-martensite is not initiated. On the contrary, in case of lower stacking fault energy than above given value the ?-martensite is formed preferentially. The twinning deformation acts as the decisive mechanism contributing to the achievement of high mechanical properties. In case of twinning deformation process yield strength reaches 500MPa, ultimate tensile strength value corresponds to 1100MPa and total elongation equals 50 ? 60% by practically the same level of uniform elongation. The necking formation is suppressed in this case. Above mentioned parameters are reached under the room temperature. Further, an important property characterizing the impact resistance of the FeMnTWIP1100 alloy is high energy absorption defined as dissipation energy per unit volume. The value detected for investigated high manganese alloy is 0.50Jmm3 approximately, while the conventional material types (deep drawing steels) only attain the level about 0.20 ? 0.22Jmm3.