界面特征对颗粒增强金属基复合材料弹性模量和界面阻尼的影响

Influence of Interfacial Features on Young's Modulus and Interfacial Damping of Particle-Reinforced Metal Matrix Composites

通过将颗粒增强金属基复合材料(PRMMCs)中的界面层和增强颗粒视为等效增强体,结合SiCP/Al复合材料,计算了界面厚度和界面结合强度对PRMMCs的弹性模量和界面阻尼的影响.理论结果表明:无论增强体中是否计入界面体积,弹性模量随界面层厚度减少而增加,随界面结合强度提高而增加;而界面阻尼则相反;当增强体中计入界面体积时,较厚的界面对弹性模量和界面阻尼影响较大.理论研究与实验结果相符,并为实际制备复合材料时控制界面提供了科学依据.

Influences of the thickness and bond strength of interface on Young＇s modulus and interfacial damping of SiCp/Al composites are.calculated by considering the reinforcement together with the interface as an equivalent reinforcement. The theoretical results show that whether the volume of interface is included in the reinforcement or not, Young＇s modulus increases with reducing thickness of interface and enhancing bond strength of interface; while the opposite is true of interfacial damping. The influence of thicker interface on Young＇s modulus and interracial damping is much stronger when reinforcement includes the interface. The theoretical results coincide well with experimental data and provide scientific foundation for preparation of particle reinforced metal matrix composites in practice.