Remarkable Improvement of Damping Capacity of Mn–20Cu–5Ni–2Fe (at%) Alloy by Zinc Element Addition

Abstract

In this paper, the effect of Zn element addition on martensitic transformation and damping capacity of Mn-20Cu-5Ni-2Fe (at%, M2052) alloy has been investigated systematically by using X-ray diffraction, optical microscopy, and dynamic mechanical analyzer. The results show that martensitic transformation and damping capacity have a crucial dependence on the addition of Zn element. It not only can markedly enhance the damping capacity of M2052 alloy at room temperature (internal friction Q À1 increases by %23% compared to M2052 without Zn as strain amplitude reaches 4 Â 10 À4 ), but also reduces the attenuation of damping capacity effectively at elevated temperatures. This is mainly because the addition of Zn element can evidently increase the Gibbs free energy difference between g parent phase and g' phase produced by face centered cubic to face centered tetragonal (f.c.c-f.c.t) phase transformation, and then raises the martensitic transformation and its reverse transformation temperatures, eventually leading to the apparent increase of amount of f.c.t g' phase micro-twins as damping source and the significant enhancement of damping capacity. It will be of great value for design and optimization of highperformance M2052 damping alloy toward practical applications.

Indicatory surface of anelastic-elastic properties of Ti alloys

“…Under a mechanical load, the real crystal total deformation consists of elastic and anelastic constituents ε ∑ = ε E + ε IE . The motion of dislocations causes anelastic deformation ε IE [1][2][3][4][5][6][7][8][9][10][11][12]. Anelastic deformation depends on temperature ε IE (t) and elastic deformation ε E happens 'instantly'.…”

“…Non-destructive internal friction (IF) Q −1 method is related to intermetallic alloy parameter analysis based on the positions of IF maximum -Q , M 1 relaxation time τ, and their contribution to the damping of elastic vibrations [1][2][3][4][5][6][7]. Information about the dynamics of structure defects, their distribution, mobility, interaction of defects with each other, processes of nanocomplexes formation and their dissociation contains in measurement of IF Q −1 and modulus defect ΔE/E at different temperatures Т, deformation amplitudes ε and frequencies f. Measuring the elastic characteristic descriptions of crystals can provide information about anharmonic effects.…”

Enhancement of Wear and Corrosion Resistance of M2052 Damping Alloys by Electroless Plating Ni–P Coating

“…8) In this case, damping alloys has been one of the best choices for noise and vibration reduction. However, the high damping alloys usually performs bad corrosion resistance and limit its engineering application greatly, such as Fe-Mn, 9) Mg-Zr, 10) Ni-Ti, 11) and Mn-Cu 12) alloys, etc. Especially, the components in ships, exploration or mining equipment, pipelines, etc., which bear heavy vibration and corrosion of seawater during long time working.…”

“…[13][14][15] M2052 alloys were originally designed by Yin et al, 16) and had been widely studied by researchers last decades. Recently, many researchers have paid attention to the poor corrosion resistance of M2052 alloys and tried to improve the corrosion resistance by alloying other elements such as Zn, 12) and Al 17) in order to increase the possibilities of engineering applications. As we all known, it is always limited to improve the corrosion resistance by alloying elements.…”

Brazing of Mn–Cu Alloy and 430 Stainless Steel with Cu–34Mn–6Ni–10Sn Filler Metal

“…MnCu alloys have received much attention for their high damping capacity and mechanical properties, 1,2) and have been used for vibration and noise reduction in the fields of aerospace, automotive, nuclear industry and machinery manufacturing. 3,4) Ferritic stainless steels (SS) are widely used in industry for their good thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. 5) Joining MnCu alloys and ferritic stainless steels can achieve the material with complementary performance and expand the application of MnCu alloy in engineering area.…”