The Damping Capacity of AZ91 Magnesium Matrix Composites Reinforced with the Coated Carbon Fiber Fabric

Abstract

A novel technology to obtain high damping capacity in magnesium matrix composites was developed by designing a special interface layer. The interface layer was fabricated by coating a pyrocarbon on the surface of carbon fibers. Experimental results reveal that the carbon coating on carbon fibers may improve the overall damping of composite from room temperature to about 170°C. The relevant damping mechanisms are ascribed to dislocation damping, interface damping and the intrinsic damping of the constituents. At temperature above 170°C, the damping of the composite without the coating exceeds that with the coating owing to the contribution of interface damping and grain boundary damping.