颗粒尺寸对SiC_p/2024Al复合材料性能的影响

Effects of Particles Size on the Mechanical Properties of SiC_p/2024Al Composites

采用挤压铸造工艺制备陶瓷体积分数达50%的SiCp/2024Al复合材料,并研究了颗粒尺寸对复合材料力学性能的影响。研究结果表明,随颗粒尺寸从40μm减小到10μm,复合材料抗弯强度升高,断裂韧度变化不大。当颗粒尺寸为10μm时,复合材料的抗弯强度和断裂韧度分别为806MPa和11.9MPa.m1/2。断口分析显示,当颗粒尺寸减小时,复合材料的主要断裂模式由陶瓷粒子断裂转为陶瓷/金属界面解离。

The effects of particles size on the mechanical properties of the SiCp/2024Al composites with a high volume fraction (50%) of SiC particle prepared by squeezing casting method have been investigated. The results show that with the decrease of particle size from 40 μm to 10 μm, the bending strength of the composites can be increased with little change of fracture toughness. The bending strength and fracture toughness of SiCp/2024Al with particle size of 10 μm are 806 MPa and 11.7 MPa·m1/2, respectively. The main fracture mechanism is changed from particle cracked to particle/matrix interface debonding with the decrease of particle size.