碳纳米管增强2024Al基复合材料的组织与性能

Microstructure and Mechanical Properties of CNT/2024Al Composite

通过高能球磨和粉末冶金的方法制备了不同质量分数的碳纳米管(CNT)增强2024A1基复合材料。分析了该复合材料的微观结构、力学性能以及混合粉末的变化。结果表明,高能球磨可使CNT较均匀地分散到2024A1基体中。当CNT为2wt%时,该复合材料的力学性能达到了最优值,其中屈服强度相对于2024A1基体提高了20.28%;当CNT为3wt%时,在基体中形成了大量的团聚,该复合材料力学性能大幅下降。

CNT/2024A1 composite reinforced with different CNT contents was fabricated by high-energy ball-milling and powder metallurgy method. The microstructure and mechanical properties of the composite, the change of mixed powder were analyzed. The results show that a certain mass of CNT uniformly disperse in 2024A1 matrix by ball-milling. The composite reinforced by 2wt% CNT exhibits the best mechanical performance, the yield strength is improved by 20.28% compared with 2024A1 matrix. When CNT mass fraction reaches 3wt%, lots of clusters are aggregated in the matrix, and therefore, the tensile properties of the composite significantly reduce.