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用气压浸渗工艺制备了体积分数40％-50％Al2O3颗粒增强纯铝基复合材料,使用了4种不同尺寸的Al2O3颗粒,其平均粒径分别为5μm、10μm、30μm和60μm.测定了这些复合材料的静、动态压缩性能,并通过材料压缩前后密度变化的测量定量表征了材料的累计损伤.结果表明,与基体材料相似,这些复合材料表现出明显的应变率敏感性;当增强颗粒平均粒径小于60 μm时,材料的累计损伤基本与应变率无关,而主要取决于材料的应变.材料中颗粒的破裂主要是由颗粒间的相互作用引起的.较小尺寸颗粒增强的复合材料具有较高的流动应力和较小的累计损伤,并随着颗粒体积分数的增加,材料的流动应力和损伤率都相应增加.
The volume fraction of 40% -50% Al2O3 particles reinforced pure aluminum matrix composites were prepared by gas pressure infiltration process, using 4 different sizes of Al2O3 particles with the average particle size of 5μm, 10μm, 30μm and 60μm respectively. The static and dynamic compressive properties of the composites were measured and the cumulative damage of the composites was quantitatively measured by measuring the density changes before and after compression of the composites.The results showed that these composites showed obvious strain rate sensitivity similar to the matrix materials.When the average particle size When the particle size is less than 60 μm, the cumulative damage of the material is basically independent of the strain rate and mainly depends on the strain of the material. The breakage of the particles in the material is mainly caused by the interaction between the particles. The smaller size particle reinforced composite material has Higher flow stress and smaller cumulative damage, and as the volume fraction of particles increases, the flow stress and the damage rate of the material increase correspondingly.