Application of damping mechanism model and stacking fault probability in Fe–Mn alloy

In this paper, the damping mechanism model of Fe–Mn alloy was analyzed using dislocation theory. Moreover, as an important parameter in Fe–Mn based alloy, the effect of stacking fault probability on the damping capacity of Fe–19.35Mn alloy after deep-cooling or tensile deformation was also studied. The damping capacity was measured using reversal torsion pendulum. The stacking fault probability of γ-austenite and ε-martensite was determined by means of X-ray diffraction (XRD) profile analysis. The microstructure was observed using scanning electronic microscope (SEM). The results indicated that with the strain amplitude increasing above a critical value, the damping capacity of Fe–19.35Mn alloy increased rapidly which could be explained using the breakaway model of Shockley partial dislocations. Deep-cooling and suitable tensile deformation could improve the damping capacity owning to the increasing of stacking fault probability of Fe–19.35Mn alloy.