(1. 西安理工大學(xué) 材料科學(xué)與工程學(xué)院， 西安 710048；
2. 西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室， 西安 710072)
摘 要: 利用低頻內(nèi)耗測(cè)試技術(shù)研究了ZA27-4%Si合金的阻尼性能，分析了合金的阻尼機(jī)理。 結(jié)果表明： ZA27-4%Si合金阻尼隨頻率增大而減小， 隨溫度升高而增大， 阻尼不隨應(yīng)變振幅的變化而變化； ZA27-4%Si合金室溫阻尼為5.83×10-3，與ZA27合金阻尼相當(dāng)； ZA27-4%Si合金的阻尼是由合金內(nèi)部的晶界和相界面滑動(dòng)、 位錯(cuò)振動(dòng)以及各相的熱膨脹系數(shù)和彈性模量間差造成的微塑性變形共同造成的。硅合金化的ZA27合金具有良好耐磨減摩性能和減振性能。
關(guān)鍵字: ZA27-4%Si合金； 阻尼性能； 阻尼機(jī)理
ZA27-4%Si alloy
LIU Hong-zhao1, YANG Gen-cang2
（1. School of Materials Science and Engineering, Xi′an University of Technology, Xi′an 710048, China;
2. State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University,Xi′an 710072, China）
Abstract:The damping capacity of ZA27 alloy doped with 4%Si (denoted as ZA27-4%Si) was investigated by using a multifunctional internal friction apparatus; the damping mechanism of the alloy was also analyzed. It is found that damping capacity of the alloy increases with the increasing of temperature and the decreasing of frequency, while the damping capacity is not dependent on vibration amplitude. The damping capacity (i.e Q-1, ) of the ZA27-4%Si alloy is relatively high, the value of Q-1 in ambient temperature is 5.83×10-3. It is indicated that the damping of the alloy is induced by phase interface slipping or grain boundary viscous sliding, the infinitesimal plastic deformation which is caused by the difference of elastic modules and heat expansion coefficients between phases of the alloy. Based on the experiment result, it is proposed that ZA27-4%Si is an excellent alloy with the properties of high damping, good wear-resistance, and is proper for the sliding bearing alloys.
Key words: ZA27-4%Si alloy; damping capacity； damping mechanism
