The damping capacity of fiber reinforced AZ91 magnesium matrix composites

In fiber reinforced magnesium matrix composites, a special interfacial layer was obtained by coating a pyrocarbon on the surface of fibers, and then, the damping capacity of the composites was studied. The results show that, the carbon coating on the fibers may improve the overall damping of composite when temperature is lower than about 170℃, the relevant damping mechanisms are ascribed to dislocation damping, interface damping and the intrinsic damping of the constituents; while at temperature above 170℃, the damping of the composite without the coating exceeds that with the coating owing to the contribution of interface damping and grain boundary damping.