2024Al matrix composites reinforced with 0~4.2vol.% carbon nanotubes (CNTs) were fabricated by powder metallurgy technique. The purification of CNTs, uniformly dispersion of CNTs among alloy powders, the thermal stability of CNTs and Al and the densification of the composites were systemically investigated and analyzed. By using SEM, TEM, XRD, XPS, HRTEM, DSC, tensile test and hardness test techniques, the microstructure, the mechanical properties and the processing parameters of the composites were e...