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通过搅拌铸造法向半固态AZ91D镁合金中添加粉煤灰漂珠(FAC)制备了FAC/AZ91D镁合金复合材料,研究了FAC粒径对该复合材料阻尼性能的影响。结果表明:FAC/AZ91D镁合金复合材料的阻尼性能明显优于基体材料,在FAC含量相同时,FAC的粒径越大,其阻尼性能越好。室温下FAC对提高FAC/AZ91D镁合金复合材料的阻尼性能起重要作用,FAC附近的基体产生了高密度的位错,形成了塑性区。室温下FAC粒径越大,在其附近产生的塑性区越大,阻尼性能越好。随温度的升高,FAC/AZ91D镁合金复合材料的阻尼性能迅速提高。位错、晶界以及FAC和基体之间的界面运动是提高阻尼性能的关键。
FAC / AZ91D magnesium alloy composites were prepared by adding casting fly ash floating beads (FAC) into the semi-solid AZ91D magnesium alloy by stirring casting method. The effect of FAC particle size on the damping properties of the composites was investigated. The results show that the damping property of FAC / AZ91D magnesium alloy composite is obviously better than that of matrix. When the FAC content is the same, the larger the particle size of FAC is, the better the damping property is. FAC plays an important role in improving the damping properties of FAC / AZ91D magnesium alloy composites at room temperature. The matrix near the FAC produces high-density dislocations and forms a plastic zone. The larger the FAC particle size at room temperature, the greater the plastic zone in the vicinity of it and the better the damping performance. With the increase of temperature, the damping capacity of FAC / AZ91D magnesium alloy composites increases rapidly. Dislocations, grain boundaries, and interfacial movement between the FAC and the substrate are key to improving damping performance.