Influence of Alloy Elements on Stacking Fault Energy of Fe-Mn-Si Shape Memory Alloy

The stacking fault energy of Fe-Mn-Si,Fe-Mn-Si-Cr and Fe-Mn-Si-Cr-Ni alloys respectively is calculated according to the thermodynamic model.The calculated results show that the stacking fault energy of Fe-Mn-Si system alloys decreases when Si% increases and the stacking fault energy of the alloys increases when Mn%,Cr% and Ni% increases.The effect ratio of alloy elements on stacking fault energy is -0.2711.11.7 ( Si%Mn%Cr%Ni% ).To obtain good SME,the stacking fault energy of alloys should be as low as possible.Manganese content decreases when adding chrome and nickel in order to low intrinsic stacking fault energy.