采用空气加压渗流技术制备了宏观石墨颗粒增强的工业纯铝基复合材料;在温度范围为25～400 ℃、低频率和低应变振幅条件下用多功能内耗仪测量了材料的内耗(阻尼性能)和相对动力学模量;用透射电子显微镜对其微观结构进行了观察.结果表明:该复合材料界面上存在少量微孔,颗粒与基体之间为弱结合,其阻尼性能在相同宏观石墨颗粒粒径下随着石墨颗粒体积分数的增加而增大,在相同宏观石墨颗粒体积分数下随着石墨颗粒粒径的减小而增大,其阻尼性能比工业纯铝的提高了2～3倍;该复合材料的主要阻尼机制是界面阻尼和位错阻尼.

Macroscopic graphite particulate reinforced commercially pure aluminum matrix composites were prepared by air pressurization seepage technique.The internal friction (damping properties) and relative dynamic modulus were tested in the temperature range of 25-400 ℃ at low frequencies and strain amplitudes by using multifunction internal friction apparatus.The microstructure of the composites was observed by means of transmission electron microscope.The results show that little micro pores were found on the interface of the composites,and the bonding between the particles and the matrix was weak.With the increase of the graphite particulate volume fraction the damping properties of the composites with same graphite particles grain size increased.With the increase of the graphite particulate grain size the damping properties of the composites with same graphite particulate volume fraction increased.Compared with the damping properties of the commercially pure aluminum,the damping properties of the composites increased 2-3 times.The main damping mechanisms for the composites were the interface damping and dislocation damping.