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利用Hopkinson压杆对采用无压浸渗法制备的高体积分数SiCp/Al复合材料进行高应变率冲击压缩实验,研究了应变率对复合材料微观断口形貌的影响,分析了其在高应变率下的变形机制.结果表明:强度较高的复合材料有较强的产生变形局部化的倾向;同时,SiC颗粒尺寸对局部化的形成有明显影响,增强相颗粒尺寸较小(100μm)的复合材料更容易产生变形局部化,在高应变率压缩载荷下,无压浸渗高体积分数SiCp/Al复合材料在增强相颗粒破裂的同时会出现基体的局部化变形,复合材料的损伤行为与材料中的增强相颗粒尺寸密切相关.
The Hopkinson pressure bar was used to carry out high strain rate impact compression experiments on high volume fraction SiCp / Al composites prepared by pressureless infiltration method. The effect of strain rate on the microstructure of the composites was studied. The results show that the composites with higher strength have a stronger tendency to deform localization, while the size of SiC particles has a significant effect on the formation of localization, and the composites with smaller particle size (100μm) The material is more likely to deform localization, under high strain rate compression load, the high volume fraction SiCp / Al composites without pressure infiltration can cause localized deformation of the matrix while strengthening the phase particles, the damage behavior of the composites and the material The phase size of the reinforcing phase is closely related.