Fig. l(a).This structure is consistent with that obtained by slow cooling in Fe-20Mn alloy.3) On the other hand, alloys A2 and A4 gave birth to a fully austenitic structure as rcpresented by Fig. I (b A typical example is shownin Fig. 3 for alloy A2.The yield stress at zero plastic strain is plotted as a function of aluminumconcentration for the 20 and The phase boundary of T/((~+T) for the 20 ryo Mn allovs wcre estimated and marked in the Fig. 4~a).

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