(1. 西安理工大学 材料科学与工程学院， 西安 710048；
2. 西北工业大学 凝固技术国家重点实验室， 西安 710072)
摘 要: 利用低频内耗测试技术研究了ZA27-4%Si合金的阻尼性能，分析了合金的阻尼机理。 结果表明： ZA27-4%Si合金阻尼随频率增大而减小， 随温度升高而增大， 阻尼不随应变振幅的变化而变化； ZA27-4%Si合金室温阻尼为5.83×10-3，与ZA27合金阻尼相当； ZA27-4%Si合金的阻尼是由合金内部的晶界和相界面滑动、 位错振动以及各相的热膨胀系数和弹性模量间差造成的微塑性变形共同造成的。硅合金化的ZA27合金具有良好耐磨减摩性能和减振性能。
关键字: ZA27-4%Si合金； 阻尼性能； 阻尼机理
ZA27-4%Si alloy
（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
