Abstract
In this paper, the damping capacities and damping mechanisms of high damping, graphite-reinforced Mg97Zn1Y2 composites were investigated. Composites consisting of different graphite particle sizes (24, 11, and 3 μm) were designed and prepared using the casting method. The microstructure of the composites was examined using optical microscopy (OM) and transmission electron microscopy (TEM), which confirmed that the graphite particles were successfully planted into the Mg97Zn1Y2 matrix. Measurements made with a dynamic mechanical analyzer (DMA) showed that the Grp/Mg97Zn1Y2 composite has a high damping capacity. At the anelastic strain amplitude stage, the damping properties of the Grp/Mg97Zn1Y2 composites were found to be higher than those of the Mg97Zn1Y2 alloy. Furthermore, decreasing the graphite particle size was found to improve the damping properties of the Grp/Mg97Zn1Y2 composites. At the microplastic strain amplitude stage, the damping properties of the Mg97Zn1Y2 alloy were found to be higher than those of the Grp/Mg97Zn1Y2 composites. Moreover, the damping properties of the Grp/Mg97Zn1Y2 composites were found to decrease with increasing graphite particle size. The reason for the increased damping of the Grp/Mg97Zn1Y2 composites during the anelastic strain amplitude stage can be attributed to the increase in the number of damping sources and weak interactions among the dislocation damping mechanisms. At the microplastic strain amplitude stage, the damping properties of the composite are mainly affected by the activation volume of the slipped dislocation.
Highlights
Magnesium-based materials are lightweight, have high specific strength and excellent damping properties, and are recyclable, making them suitable for use in the automobile, aerospace, and other industries [1]
Pure magnesium has excellent damping properties, but due to its poor strength, it cannot be used as a structural material; alloying is often used to improve its mechanical properties, but its damping capacity often decreases due to the conflict between the alloy strengthening mechanism and the dislocation damping mechanism in magnesium alloys [3,4]
In practical applications, different component parts are used to make composite materials to form the interface of different layers, which can reduce the vibration caused by internal friction [5]
Summary
Magnesium-based materials are lightweight, have high specific strength and excellent damping properties, and are recyclable, making them suitable for use in the automobile, aerospace, and other industries [1]. When using high damping magnesium alloys as a matrix, selecting appropriate reinforcements can improve the strength of the material while ensuring the damping of the composite. Because particle size affects strain amplitude, the particle size of magnesium reinforcements affects the mechanical properties of the matrix composites. The magnesium matrix composites reinforced by graphite particles were prepared by stir casting, the damping capacities were tested. The strain amplitude-dependent damping properties of a Grp/Mg97Zn1Y2 composite in the anelastic and microplastic stages and the influence of graphite particle size on the damping properties of an as-cast Grp/Mg97Zn1Y2 composite are studied and the damping mechanism of the Grp/Mg97Zn1Y2 composite is discussed. The melt was poured into a steel mold for air cooling
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