Damping Behavior and Mechanism of Graphite and Al2O3 Particles Reinforced Al Matrix Composites
The graphite and alumina particles reinforced Al matrix composites with graphite up to 5 vol% was prepared by Reciprocating Extrusion (RE). Damping behavior of the composites was measured by dynamic mechanical thermal analyzer. The composites showed more excellent damping Q-1 than pure Al manufactured by RE, and the ambient value was 9.9×10-3 at 5 Hz when the strain amplitude was 8×10-8. The damping behavior of the composites showed slight variation with frequency. The damping capacity increased with increasing of the strain amplitude when the amplitude less than 1.5×10-6, and then became a constant and independent of strain amplitude. The high damping capacity was attributed to micro-sliding interface damping and the dislocation damping.
Jing Tao Wang
Z. M. Zhang and B. Hu, "Damping Behavior and Mechanism of Graphite and Al2O3 Particles Reinforced Al Matrix Composites", Materials Science Forum, Vol. 682, pp. 225-229, 2011