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硅合金化ZA27合金具有良好的耐磨性能,但其阻尼性能(Q-1)研究尚不深入。本文利用多功能内耗仪研究了铸态ZA27合金和向ZA27合金中加入4%Si的合金(下称ZA27-4%Si合金)的阻尼行为和相对动态模量,分析了两种合金的阻尼机理。结果表明两种合金的阻尼性能随频率降低和温度升高而增大,阻尼值不随应变振幅变化。ZA27合金和ZA27-4%Si合金具有较高的阻尼性能,在0.1Hz下,合金的室温阻尼分别为6.87×10-3与5.83×10-3。合金的相对动态模量随应变频率提高而增大。100℃以下,ZA27-4%Si合金的相对动态模量不随温度变化。研究表明合金的阻尼是由合金晶界和相界面滑动、位错振荡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。认为ZA27-4%Si合金具有良好耐磨性能和减振性能和强度,适合作为滑动轴承合金材料。
Alloying ZA27 alloy has good wear resistance, but its damping performance (Q-1) research is not yet in-depth. In this paper, the damping behavior and relative dynamic modulus of the as-cast ZA27 alloy and the alloy containing 4% Si added to the ZA27 alloy (hereinafter referred to as ZA27-4% Si alloy) were studied by multi-function internal friction instrument. The damping mechanism . The results show that the damping properties of the two alloys increase with decreasing frequency and temperature, and the damping value does not change with the strain amplitude. ZA27 alloy and ZA27-4% Si alloy have high damping properties. The room temperature damping of the alloy is 6.87 × 10-3 and 5.83 × 10-3 respectively at 0.1Hz. The relative dynamic modulus of the alloy increases with the increase of strain frequency. Below 100 ℃, the relative dynamic modulus of ZA27-4% Si alloy does not change with temperature. The results show that the damping of the alloy is caused by the sliding of the grain boundary and interface, the dislocation oscillation and the micro-plastic deformation caused by the difference between the thermal expansion coefficient and the elastic modulus of each phase. ZA27-4% Si alloy that has good wear resistance and vibration damping properties and strength, suitable as a sliding bearing alloy material.