复合材料及其阻尼性能
(武汉船舶职业技术学院 船舶工程系，武汉 430050)
摘 要: 通过改变离心铸造的转速，获得了内层有较多初晶Si，其余部分为共晶组织或初晶Si由外向内偏析的Al-16%Si合金自生梯度复合材料。分析了复合材料的形成过程，考察了复合材料的组织，研究了复合材料各层的阻尼性能。结果表明：Al-16%Si合金自生梯度复合材料内层内耗是中、外层的1.4倍，为充分发挥此材料的阻尼性能，应在频率高于160Hz使用。
关键字: 离心铸造; 过共晶Al-Si合金; 自生复合材料; 阻尼性能
Al-Si alloy by centrifugal casting and its
damping property
（Wuhan Shipbuilding Polytechnic College，
Wuhan 430050，China）
Abstract:In situ gradient composite of Al-16%Si alloy，which possesses the mi crostructures of accumulated primary silicon in inner and eutectic in the rest layer or accumulated primary silicon from outer layer to inner layer，was achieved by changing the rotation rate of centrifugal casting. The formation process and the microstructure of the composite were analyzed，and the damping properties of the composite every layer were also investigated. The results show that the internal friction of inner layer of in situ gradient composite of Al-16%Si alloy is 1.4 times that of middle layer and outer layer，in situ gradient composite of Al-16%Si alloy has good damping property，when the frequency is higher than 160Hz.
Key words: centrifugal casting; hypereutectic Al-Si alloy; in situ composites; damping property
