碳纤维增强铝基复合材料的制备及其拉伸性能

The Preparation and Properties of Continuous Carbon Fiber Reinforced Aluminum Matrix Composite

利用挤压铸造方法，采用三种不同的凝固条件，制备了连续长碳纤维增强铝基复 合材料的拉伸试样，并对其拉伸性能进行了试验．试验结果表明，该复合材料的抗拉强 度和弹性模量皆随碳纤维的体积含量增加而增加．含４８％碳纤维的复合材料比基体材料 的拉伸强度高５０％以上．但塑性指标随碳纤维含量的增加而显著降低．当连续碳纤维 的体积含量较小时，凝固条件对该复合材料的抗拉强度影响较大，对弹性模量的影响较 小；当碳纤维的体积含量较大时，凝固条件对该复合材料的抗拉强度影响较小，而对弹性 模量的影响较大．

The tensile test specimen of the continuous carbon fiber reinforced aluminum matrix composites were prepared by using squeeze casting under three different solidification conditions. The tensile test was also conducted. The tensile strength and elastic modulus of the composite are increased with the increase in the carbon fiber content. The tensile strength of the composite with 48 Vol.% carbon fiber is 50% higher than that of the matrix material. However, the plasticities of the composite are decreased dramatically with the increase in the carbon content. When the carbon fiber content is small, the solodification conditions have greater effect on tensile strength but smaller on elastic modulus of the composite, while large amount of carbon fibers are added, solidification conditions affect elastic modulus more and tensile strength less.