Damping of Mn – Cu alloys as a factor in reducing vibration of elements of transport systems.

Mn – Cu alloys with high damping capacity can be effectively used to reduce vibration and noise of elements of transport systems. The number of studies on the effect of iron, aluminum, nickel and zinc additives on the magnitude and stability of the damping ability of Mn – Cu double alloys is insufficient, and their results in some cases are ambiguous. Elucidation of the effect of alloying the listed elements on damping was carried out on the Cu + 60% Mn alloy. The damping capacity of Mn – Cu alloys (the logarithmic decrement of attenuation of oscillations) was studied with transverse oscillations of samples in the frequency range of (1.6 2.2) kHz and the amplitudes of the relative shift (1 ... 3) · 10−6. Two maximums of damping capacity in the Cu + 60% Mn alloys with 0.6% and 4.6% aluminum, 1.0% and 10.0% zinc, quenched with 1093 K in water, and after aging at a temperature of 673 K were revealed. Obtaining these maximums of damping capacity is due obviously to two simultaneous processes in Mn – Cu alloys: the formation of nuclei of the martensitic face-centered tetragonal phase and pure γ-manganese, which turns into a stable α-manganese phase during cooling. It has been established that alloying with 2.0% and 4.3% iron, 0.6% and 4.6% aluminum, 1.0% and 2.9% nickel, 1.0% and 10.0% zinc does not increase the level of damping capacity of the Cu + 60% Mn double alloy and does not contribute to safekeeping high damping during natural aging in the amplitude-independent damping scope. [ABSTRACT FROM AUTHOR]