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采用真空吸渗挤压工艺制备了二维碳纤维增强铝基(2D-Cf/Al)复合材料。在挤压力(比压)为60~90 MPa、真空度为10~30 k Pa、浸渗挤压温度为580~620℃、保压时间为60~120 s时,可以获得浸渗充分和成形质量良好的复合材料。微观组织观察分析表明,基体合金和碳纤维分布均匀,纤维无折断、漂移现象,无明显微观缺陷。对Cf/Al复合材料进行密度和拉伸性能测试,其密度比基体合金降低17.9%,抗拉强度提高100%。热处理实验表明,经过T6热处理,基体合金的组织得到改善,内部应力和缺陷得到有效控制和消除,抗拉强度提高41%,而碳纤维和基体合金热膨胀系数的差异会在复合材料内部产生不良应力,导致其拉伸性能没有提高反而下降16%。
Two-dimensional carbon fiber reinforced aluminum-based (2D-Cf / Al) composites were prepared by vacuum infiltration extrusion process. When the pressure is 60 ~ 90 MPa, the vacuum degree is 10 ~ 30 k Pa, the infiltration extrusion temperature is 580 ~ 620 ℃ and the dwell time is 60 ~ 120 s, Forming good quality composite materials. Microstructure observation and analysis showed that the matrix alloy and carbon fiber were evenly distributed, the fiber did not break and drift, and there was no obvious microscopic defects. Density and tensile properties of Cf / Al composites were tested with a density reduction of 17.9% over the base alloy and a 100% increase in tensile strength. Heat treatment experiments show that after T6 heat treatment, the microstructure of the matrix alloy is improved, the internal stress and defects are effectively controlled and eliminated, the tensile strength is increased by 41%, and the difference of the thermal expansion coefficient between the carbon fiber and the matrix alloy can cause undesirable stress in the composite material, Resulting in its tensile properties but did not increase but decreased by 16%.