High Damping Fe-Cr-Mn Alloy

Abstract

Internal friction of Fe-Cr-Mn alloys have close relations with chemical compositions, constituent phases and cold work degree. In Fe-Cr-Mn alloys, phases are composed from γ,ε and α depending on chemical compositions. In solution annealed specimens, internal friction was higher when a phase was included. This suggests that a phase behaves as ferromagnetic phase and also introduces fresh dislocation surrounding it. In cold worked specimens, internal friction increases dependent on cold work degree and it was became highest when αphase is maximum. This result suggests that the stacking fault energy is minimum in this case, and the extended half dislocations are more mobile than other cases. In cold worked specimens the contribution of α phase was negligible. This alloy has damping capacity higher than 1%, with high strength (more than 1000 MPa) and high corrosion resistance.