铝合金是汽车、航空等领域轻量化过程中的重要应用材料，但铝合金强度和塑性的不足限制了其应用。为了提高5052铝合金的强度及塑性，采用多道搅拌摩擦加工的方法成功制备出碳纤维增强铝基复合材料。对复合材料的力学性能和组织形貌进行了测试和分析，结果表明：复合材料的抗拉强度相较于母材提升了18.9%，延伸率提升了19.7%。通过扫描电镜和透射电镜观察发现复合材料中碳纤维弥散分布，复合材料断口观察到韧窝内有明显的碳纤维拔出痕迹，说明复合材料的强度及塑性提升与碳纤维的弥散分布及碳纤维的载荷转移作用有关。
Abstract
Aluminum alloys are important light metals for weight reduction in cars and aircrafts. However, aluminum alloy applications are limited when the aluminum alloy strength is not sufficient. The mechanical properties of Al5052 can be improved by using carbon fiber reinforced aluminum composites fabricated using multiple-pass friction stir processing (FSP). The mechanical properties and microstructures of the composites are investigated with the composite having 18.9% higher tensile strength and 19.7% higher elongation rate than the matrix. The microstructure observation indicates that the carbon fibers are uniformly dispersed in the matrix. Fractography results show pulled-out carbon fibers in the inner surfaces of dimples. The strengthening of the composites is due to load transfer to the homogeneous carbon fibers.
关键词
铝基复合材料 /
碳纤维 /
搅拌摩擦加工 /
力学性能
Key words
aluminum matrix composite /
carbon fiber /
friction stir processing /
mechanical properties
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参考文献
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