Effect of the Precipitated Second Phase during Aging on the Damping Capacity Degradation Behavior of M2052 Alloy

Abstract

In this study, the damping capacity degradation in Mn-20Cu-5Ni-2Fe alloy (M2052) aged at 435 °C for 2-24 hours was investigated. The damping capacity was measured by a torsion pendulum. XRD, SEM and EDS analysis methods were used to characterize the microstructure of specimens. The results showed that aging at 435 °C for more than 4 h leaded to the precipitation of α-Mn in the matrix of M2050, which resulted in the decrease of the original damping capacity. Holding the aged samples in 60°C environment, the damping capacity of under-aged and peak-aged M2052 samples decreased rapidly with the time increasing. While no obvious degradation of damping capacity occurred in the over-aged sample even after 40 d, which is probably due to the precipitation of α-Mn phase in the matrix of alloy. M2050 alloy with high and stable damping capacity can be obtained by aging at 435°C for 8 h.

An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature

“…[Insert Figure 5 shows the dependency of damping capacity on strain-amplitude for the as-cast MnCuNiFeZnAl alloy specimens 1#-7# and as-cast M2052. The results show that the damping capacity of specimen 1# is higher than that of cast M2052 alloy (as shown in [Insert Figure 5 (a)) and the traditional forged M2052 high damping alloy mentioned in literatures [20][21] . Moreover, the damping capacity of original as-cast MnCuNiFeZnAl alloy can be further improved by subsequently homogenization-aging, solution-aging and aging treatments (as shown in [Insert Figure 5(b), (c)), among which aging treatment for 2 hrs can lead to the highest damping capacity.…”