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利用搅拌铸造法 ,在 6 0 6 3变形铝合金中添加电厂飞灰颗料 ,制备了飞灰含量分别为5 %、 10 %、 15 %、 2 0 %的铝基飞灰复合材料。采用多功能内耗仪 ,利用低频扭摆法和声频衰减法对材料的低高频内耗进行了测量。结果发现 ,在测试的温度、频率范围内 ,较之铝基体 ,复合材料的阻尼能力有较大幅度的提高 ;并且在同一频率、不同温度下 ,随着飞灰含量的增加和飞灰颗粒直径的减小 ,复合材料的内耗值有增加的趋势。另外还发现复合材料的低频内耗值要远大于其高频内耗值。在此基础上还对复合材料的内耗机制进行了探讨 ,认为该复合材料的内耗机制主要有本征内耗、位错内耗的界面内耗 ,而在较高温度下主要是界面内耗机制。
The fly ash particles of power plant were added into the deformed aluminum alloy of 6 0 6 3 by using the stirring casting method to prepare aluminum-based fly ash composite materials with fly ash content of 5%, 10%, 15% and 20% respectively. The multi-functional internal friction meter is used to measure the low-frequency internal friction of the material by using the low-frequency twist method and the audio attenuation method. The results show that compared with aluminum matrix, the damping capacity of composites increases greatly in the range of temperature and frequency under test. With the increase of fly ash content and particle size of fly ash at the same frequency and temperature, The internal friction value of composites has an increasing tendency. In addition, it is also found that the low-frequency internal composite material consumption value is much larger than the high-frequency internal consumption value. On this basis, the internal friction mechanism of the composite material is also discussed. It is concluded that the internal friction mechanism of the composite material mainly includes intrinsic friction loss and interfacial friction loss of dislocation internal friction, while the interfacial friction mechanism is mainly at higher temperature.