Damping capacity in Fe-Mn based alloys

1) Stacking faults and ε martensite both act for damping with the latter much more effective. The damping capacity by ε martensite is proposed to be caused by the phase boundary movement with the static hysteresis on vibration. 2) We show that damping capacity of Fe-Mn based alloys depends on the area and mobility of γ/ε boundary by varying microstructure. At a low strain amplitude, the area is more dominant than the mobility, and reverse is also true.