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Composites of AZ91D magnesium alloy reinforced with fly-ash cenosphere (FAC) were prepared by a stirring method. The effects of the FAC particle size (83, 116, and 146 μm) and the test frequency (0.5, 1, and 5 Hz) on high-temperature damping capacity and dynamic Young's modulus of the composites were investigated. The results show that the FAC particles distributed homogeneously in the Mg-alloy matrix and some new phases formed. The composites with 146-μm FAC exhibited the highest damping capacity at all test frequencies at high temperatures, whereas the highest dynamic Young's modulus was exhibited by the composites with 83-μm FAC. Therefore, composites with good damping capacity and mechanical properties could be obtained through selection of reinforcement particles of an appropriate size.

The influence of FAC particle size on the damping capacity and dynamic Young's modulus of AZ91D/FAC composites at high temperature