Construction materials have to possess, first and foremost, a good combination of strength and plasticity. In recent years, research into addition to steels of manganese, which is regarded as a very attractive alloying element, has been increasing , , , , , ,  and , in particular, for the automotive industry. For the new generation of high-manganese steels, with Al and Si additions, it is possible to obtain reduction in mass, which, indirectly, causes a decrease in the emission of harmful gases into the AMG 9810 ,  and . Fe–Mn–Si–Al alloys are used for car parts, which are intended to improve the safety of passengers in case of a collision, due to their good energy absorption capability  and . Various deformation mechanisms may act, depending on stacking fault energy, SFE, namely: mechanical twinning (TWIP-effect), deformation-induced phase transformation (TRIP-effect); alternatively, shear bands (SBIP-effect) may be formed , , ,  and . The value of SFE is influenced principally by chemical composition and temperature.