粉煤灰漂珠粒径对粉煤灰漂珠/AZ91D镁合金复合材料阻尼性能的影响

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。 

Effect of particle size of fly ash cenosphere on damping properties of fly ash cenospheres/AZ91D Mg alloy composites

The fly ash cenospheres (FAC)were added to semisolid AZ91D Mg alloy to prepare FAC/AZ91D Mg alloy composites by means of stir casting.The effect of particle size of FAC on the damping properties of this com-posites was investigated.The results show that the damping properties of FAC/AZ91D Mg alloy composites are bet-ter than those of matrix materials.When the content of FAC is the same,the damping properties of FAC/AZ91D Mg alloy composites rise with the increase of particle size of FAC.FAC plays a significant role in improving the damping properties of FAC/AZ91D Mg alloy composites at room temperature.The matrix nearby FAC can produce high density dislocations,which form the plastic zone.Under room temperature,the larger the particle size of FAC is,the greater the plastic zone is,which also leads to better damping properties.As the temperature increases,the damping properties of FAC/AZ91D Mg alloy composites go up rapidly.The dislocations,grain boundaries,and movement of the interfaces between FAC and matrix are the key points to enhance the damping properties.