Due to a specific industry need, LBI has developed a new non-ferous alloy.
Thanks to its chemical composition and its production by centrifugal casting, its distinctive characteristic
is to offer excellent damping properties for a metallic material (comparable to those polymer type material).

The properties of this material are as follow :

• Cu and Mn based alloy + other elements such as Al, Fe, Ni
• Very good corrosion resistance
• Density : 7.2

Mechanical properties

• Rp0.2 > 240 MPa
• Rm > 520 MPa
• A > 30 %
• Young Modulus : 80 GPA
• Torsion Modulus : 34 GPA
• Poisson Coefficient : 0.25

Damping properties (Ambient Temperature)

• tg φ ∼ 1,80.10^-2 (equivalent to 2π sin φ ∼ 11,30.10^-2)
  Damping of various vibrations :
• Longitudinal mode (4.6 Khertz), tg φ = 1.51.10^-2
• Flexion mode (240 hertz), tg φ = 1.75.10^-2
• Torsion mode (2.7 Khertz), tg φ = 0.82.10^-2

This material keeps its damping properties between -15°C and +50°C.

Below -30°C and above +60°C, its damping properties are similar to those of grey iron.