Microstructure, Mechanical Properties and Damping of SiC/Mg97Zn1Y2 Composites

Abstract

SiC particles were added to the Mg97Zn1Y2 alloy to improve its mechanical properties and damping properties. The microstructure, mechanical properties, and strain amplitude dependence of high-damping and high-strength SiC/Mg97Zn1Y2 magnesium matrix composites were analyzed. The strain amplitude-dependent damping of SiC/Mg97Zn1Y2 composites and the effect of SiC on this property were discussed herein. In anelastic damping, the strain amplitude-dependent damping curves of the composites were mainly divided into two sections, dominated by the G-L model. When the strain amplitude reaches a certain value, the dislocation motion inside the matrix becomes complicated. Moreover, the damping of the material could not be explained using the G-L model, and a new damping model related to microplastic deformation was proposed. In the anelastic damping stage, with the increase in the amount of the added SiC particles, the damping performance first increases and then decreases. Moreover, the damping value of the composite material is larger than that of the matrix alloy. In the microplastic deformation stage, the damping properties of the composites and matrix alloys considerably increase with the strain amplitude.

Keywords

high damping / high strength / magnesium matrix composites / strain amplitude

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