On the Internal Friction of Ti_(50)Ni_(25)Cu_(25) Particle/Al Smart Composite

摘要

The Ti_(50)Ni_(25)Cu_(25) particle/Al composite was fabricated with 30 vol.% Ti_(50)Ni_(25)Cu_(25) particles by hot pressing and followed by extruding methods. The internal friction (IF) measurements of the composite were carried out on an inverted torsion pendulum. Ti_(50)Ni_(25)Cu_(25) particles embedded in Al matrix improve the damping capacity of the composite. The internal friction behavior of Ti_(50)Ni_(25)Cu_(25) particles is consistent to that of the Ti_(50)Ni_(25)Cu_(25) bulk material. The mismatch of thermal expansion coefficients between Ti_(50)Ni_(25)Cu_(25) and Al contributes to the damping capacity of the composite. A high damping capacity of the composite could be obtained at low vibration frequency and large vibration amplitude.