The damping behavior of continuous SiC fiber reinforced aluminum matrix (SiC_f/Al) composite is still poorly understood. This paper examined the temperature dependence and strain amplitude dependence of damping capacities in 30 vol% SiC_f/Al composites including SiC_f/2024Al, SiC_f/6061Al and SiC_f/AlFe5Si2 composites, and the unreinforced aluminum alloys. Microstructure characterization was performed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscattered diffraction (EBSD) and X-ray diffraction (XRD) analysis to investigate the operative damping mechanisms in the SiC_f/Al composites. The results show that uniform dispersion of SiC_f and good interface bonding were achieved with these SiC_f/Al composites. The damping capacity and dynamic modulus of these composites were greatly improved as compared with that of the unreinforced aluminum alloys. The dominant damping mechanisms for SiC_f/Al composites were dislocation damping at low temperatures (< 150 ℃), and grain boundary damping and interface damping at high temperatures (> 150 ℃). This work indicated that the SiC_f/AlFe5Si2 composite simultaneously exhibited good damping capacity and high dynamic modulus, having potential for aerospace applications.

对连续 SiC 纤维增强铝基 (SiC _f /Al) 复合材料的阻尼行为仍知之甚少。本文研究了 30 vol% SiC _f /Al 复合材料（包括 SiC _f /2024Al、SiC _f /6061Al 和 SiC _f /AlFe5Si2 复合材料）以及未增强铝合金的阻尼能力的温度依赖性和应变幅度依赖性。通过扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、电子背散射衍射 (EBSD) 和 X 射线衍射 (XRD) 分析进行微观结构表征，以研究 SiC _f /Al 复合材料中的有效阻尼机制。结果表明 SiC 的均匀分散这些 SiC _f /Al 复合材料实现了_f和良好的界面结合。与未增强的铝合金相比，这些复合材料的阻尼能力和动态模量有了很大的提高。SiC _f /Al 复合材料的主要阻尼机制是低温（< 150 ℃）下的位错阻尼和高温（> 150 ℃）下的晶界阻尼和界面阻尼。这项工作表明，SiC _f /AlFe5Si2 复合材料同时表现出良好的阻尼能力和高动态模量，具有航空航天应用的潜力。