Abstract
The contribution deals with the stacking fault energy (SFE) evaluation both of the TWIP high manganese alloys and of the TRIPLEX ones. Chemical composition of the TWIP variant includes varying Mn contents (20, 23, 27, and 30 wt.%) and C levels (0.65, 0.85, 1.0, and 1.2 wt.%). The TRIPLEX variants take into account 12 wt.% of Al content. By use of available thermo-dynamic data and constants the SFE levels of two basic high manganese alloy types are presented. The results are compared mutually and with literary pieces of knowledge. The higher Mn and Al contents significantly increase the SFE. However, the Al influence is stronger. Carbon and the Fe contents show weak effects. The results signify the dominant influence of Mn with decreasing Fe content.

Key words
high manganese alloys, TWIP, TRIPLEX, stacking fault energy

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