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设计并采用真空气压浸渗法制备了不同颗粒尺寸的高体积分数SiCp/AZ91D镁基复合材料,研究了颗粒尺寸对镁基复合材料热膨胀性能的影响。结果表明,改变颗粒尺寸是调节镁基复合材料热膨胀性能的一种非常有效的手段。相同体积分数复合材料的热膨胀系数随颗粒尺寸的减小而逐渐降低,不同体积分数的SiCp复合材料的热膨胀系数与复合材料的界面面积成反比关系;减小颗粒尺寸与提高颗粒体积分数一样,能有效降低复合材料的热膨胀系数;颗粒尺寸对镁基复合材料热膨胀性能的作用机制主要是通过复合材料的界面面积、致密度及其镁基体的位错密度来实现的。
The high volume fraction SiCp / AZ91D magnesium matrix composites with different particle sizes were designed and prepared by vacuum infiltration. The effect of particle size on the thermal expansion of magnesium matrix composites was investigated. The results show that changing the particle size is a very effective way to adjust the thermal expansion of magnesium matrix composites. The thermal expansion coefficient of composites with the same volume fraction gradually decreases with the decrease of particle size. The thermal expansion coefficient of SiCp composites with different volume fractions is inversely proportional to the interfacial area of composites. Reducing the particle size is the same as increasing the particle volume fraction Which can effectively reduce the thermal expansion coefficient of the composite. The effect of the particle size on the thermal expansion of the Mg-based composite material is mainly achieved through the interfacial area of the composite material, the density and the dislocation density of the magnesium matrix.