Damping Properties of Aluminium Matrix Cenosphere Composite
In order to improve the damping properties of aluminium alloy, aluminium matrix cenosphere composites were produced through pressure infiltration. Damping properties of composite were investigated in different conditions by dynamic mechanical and thermal analyzer. The results show that the damping properties of composite are better than aluminum matrix alloy during 20～180 ℃. At room temperature, the damping value of composite is about 4.5×10-3, which is about 2 times than that of aluminum matrix alloy. It increases while the size of cenosphere reduces. The main damping mechanisms are dislocation damping, interface damping and porosity effect of second phase.