Damping Capacity in Fe-27Mn-3.5Si Alloy

Abstract

Damping capacity in an Fe-27Mn-3.5Si alloy has been greatly improved with significant anisotropy by cold-rolling. The alloy, consisting of stacking faults and thermal ε martensite before rolling, shows poor damping capacity at low strain amplitude and strong amplitude dependence. The increase and anisotropy in the damping capacity are attributed to ε martensite induced by cold-rolling.
The alloy is found to adjust itself to the deformation by forming ε martensite which has a preferred orientation of (1013)ε [3032]ε. The mechanism of formation of the preferred orientation can be explained by the shear model in γ→ε transformation.
With the result of microstructure and preferred orientation, a damping mechanism by ε martensite and its anisotropy is discussed.