SiC颗粒增强镁－锌－锆基复合材料的阻尼性能

Damping Capacity of SiC Particulate Reinforced Mg-Zn-Zr Composites

采用热压烧结法制备了三种不同成分的SiC颗粒增强镁-锌-锆基复合材料，使用LMR-I型低频力学弛豫谱测试系统研究了铸态镁-锌-锆合金及热压烧结SiCp／镁-锌-锆基复合材料的阻尼性能随频率和温度的变化关系。结果表明：SiC颗粒的加入使复合材料的阻尼性能比基体合金有显著提高；另外随着合金中锌含量的增加，复合材料的内耗值不断下降；在频率为3×10^-3～7Hz范围内，基体合金及复合材料的内耗值均随着频率的增加先快速减小随后又逐渐增大；在本试验条件下SiCp／Mg-0．93％Zn-0．70％Zr基复合材料的内耗值最大，该复合材料在50～100℃的温度范围内出现弛豫内耗峰。

SiC particulate reinforced Mg-Zn-Zr composites were prepared by hot-pressing sintering method. The variation of the damping capacity of cast Mg-Zn-Zr matrix alloy and SiCp/Mg-Zn-Zr composites prepared by hotpressing sintering with frequency and temperature was investigated by meatus of LMR-1 low-frequency torsion pendulum system. The results show that the addition of SiC particulates increased the damping capacity of the SICp/Mg-Zn-Zr composites apparently. The damping capacity of the composites decreased with the increase of Zn content in the alloy. The damping capacity of the Mg-Zn-Zr matrix alloy and the composites both decreased firstly and then increased with the increase of frequency in the range of 3×10^-3 -7 Hz. Among all the samples, SiCp/Mg-0. 93% Zn-0.70%Zr composite had the highest damping capacity and there was a hysteresis-damping peak for this composite at 50--100 ℃.