復(fù)合材料及其阻尼性能
(武漢船舶職業(yè)技術(shù)學(xué)院 船舶工程系，武漢 430050)
摘 要: 通過改變離心鑄造的轉(zhuǎn)速，獲得了內(nèi)層有較多初晶Si，其余部分為共晶組織或初晶Si由外向內(nèi)偏析的Al-16%Si合金自生梯度復(fù)合材料。分析了復(fù)合材料的形成過程，考察了復(fù)合材料的組織，研究了復(fù)合材料各層的阻尼性能。結(jié)果表明：Al-16%Si合金自生梯度復(fù)合材料內(nèi)層內(nèi)耗是中、外層的1.4倍，為充分發(fā)揮此材料的阻尼性能，應(yīng)在頻率高于160Hz使用。
關(guān)鍵字: 離心鑄造; 過共晶Al-Si合金; 自生復(fù)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
