The effects of carbon nanotube aspect ratio (R) on mechanical properties of CNT/Al composites containing 0–2.0 wt% CNTs are studied. The optimum carbon nanotube (CNT) reinforced aluminum (Al) composites are fabricated at 580 °C for 1 h under 60 MPa, and subsequently hot extruded at 480 °C. CNT addition within 0.5 wt% can increase the strength significantly without plasticity loss, which overcomes the dilemma of strength and toughness. Strength and hardness increase significantly due to the uniformly distributed CNTs in Al matrix within a content of 1.0 wt%. Quantitatively fitting results also show that the main strengthening mechanism of CNT/Al composites should be dispersion strengthening rather than load transfer. The R, which is very crucial for load transfer theory, has only small effects on the mechanical properties of CNT/Al composites. The calculated CNTs diameters are close to the experimental used ones.

研究了碳纳米管的长径比（R）对含有0-2.0 wt％CNTs的CNT / Al复合材料的力学性能的影响。最佳的碳纳米管（CNT）增强的铝（Al）复合材料在580°C，60 MPa下制造1小时，然后在480°C进行热挤压。在0.5wt％内添加CNT可以显着增加强度而没有塑性损失，这克服了强度和韧性的难题。由于碳纳米管在Al基体中的含量在1.0 wt％内均匀分布，因此强度和硬度显着提高。定量拟合结果还表明，CNT / Al复合材料的主要增强机理应该是分散增强而不是载荷传递。在[R对载荷传递理论至关重要，对碳纳米管/铝复合材料的机械性能影响很小。所计算的CNT直径接近于实验所用的直径。