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 y, E and a 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 E phase 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 a phase was negligible. This alloy has damping capacity higher than 1%, with high strength (more than 1000 MPa) and high corrosion resistance.

A novel sandwich Fe-Mn damping alloy with ferrite shell prepared by vacuum annealing

“…As such, the damping alloys have wide potential applications in different industry fields, such as automobile, machinery, aerospace, and so on [2]. According to damping mechanisms, there are several kinds of damping alloys: twin-boundary (or phase boundary) damping alloys (Mn-Cu [3], Ni-Ti [4,5], Cu-Zn-Al [6], etc), natural composite damping alloys (gray cast-iron [7]), superplastic damping alloys (Zn-Al [8]), dislocation damping alloys (Mg-Zr [9]), ferromagnetic damping alloys (Fe-Cr [10][11][12][13], Fe-Al [14], etc), and Fe-Mn damping alloys [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Among these damping alloys, the Mn-Cu alloys have high damping capacity, but can be used only below 80 °C [3].…”

“…The Mg based alloys also exhibit high damping capacity, but their strength is low [7,9,33]. The ferromagnetic Fe-Cr based alloys possess high damping capacity only at relatively low strain amplitudes (1×10 −4 ∼2×10 −4 ) [12], and their damping capacity will decline dramatically under magnetic field or stress field [13]. Thus, it is still of significance to develop the damping alloys with high strength and high damping capacity under wide working temperatures and wide strain amplitudes.…”

Strengthening of a FeMnSi-based shape memory alloy by dispersion of χ-phase domains

“…Alloys with large pseudo-elasticity and high strength, such as specimens E, F and G, having different properties from usual spring steels, may be used as a damping material instead of an SMA. Recently, Fe-Mn [25] and Fe-Mn-Cr [26,27] alloys have been shown to have high damping properties due to the "-phase. Therefore, it is may be possible to use Fe-Mn-Si-based alloys as a damping material with a higher strength due to dispersion of the -phase domains.…”

Effect of Chromium Addition on Damping Capacity, Mechanical Property, and Corrosion Resistance of Fe-18%Mn Alloy

“…Discovery of shape memory effect in Fe-Mn based alloys [3,4] undergoing non-thermoelastic γ↔εmartensitic transformation raise a possibility that the alloys can absorb mechanical energy by internal friction. Recently, some authors have reported damping properties in Fe-Mn-Si-Cr [5], Fe-Ni-Mn [6], Fe-Cr-Mn [7,8] and Fe-Mn-Si [9] alloys which possess strain-induced ε martensite. Though the proposed mechanisms of damping capacity are a little different, stress-induced ε martensite is always in common.…”