Rativa-Parada Wilson, Nilufar Sabrina
School of Mechanical, Aerospace, and Materials Engineering, Southern Illinois University, Carbondale, IL 62901, USA.
Nanomaterials (Basel). 2024 Aug 14;14(16):1342. doi: 10.3390/nano14161342.
Nanocarbon 2024 aluminum composites with 0.5 vol. % and 1 vol. % of graphene nanoplatelets and 1 vol. % and 2 vol. % of activated nanocarbon were manufactured through induction casting. The effect of the reinforcements and heat treatment on the performance of the composites was examined. Analysis of the microstructure of the composites before heat treatment suggested the homogeneous dispersion of reinforcements and the absence of secondary carbide or oxide phases. The presence of carbon nanoparticles had a significant impact on the microstructural characteristics of the matrix. This behavior was further enhanced after the heat treatment. The mechanical and damping properties were evaluated with the uniaxial compression test, micro Vickers hardness test, and dynamic mechanical analysis. The yield strength and ultimate strength were improved up to 28% (1 vol. % of graphene nanoplatelets) and 45% (0.5 vol. % of graphene nanoplatelets), respectively, compared to the as-cast 2024 aluminum. Similarly, compared to the heat-treated 2024 aluminum, the composites increased up to 56% (0.5 vol. % of graphene nanoplatelets) and 57% (0.5 vol. % of graphene nanoplatelets) in yield strength and ultimate strength, respectively. Likewise, the hardness of the samples was up to 33% (1 vol. % of graphene nanoplatelets) higher than that of the as-cast 2024 aluminum, and up to 31% (2 vol. % of activated nanocarbon) with respect to the heat-treated 2024 aluminum. The damping properties of the nanocarbon-aluminum composites were determined at variable temperatures and strain amplitudes. The results indicate that damping properties improved for the composites without heat treatment. As a result, it is demonstrated that using small volume fractions of nanocarbon allotropes enhanced the mechanical properties for both with- and without-heat treatment with a limited loss of plastic deformation before failure for the 2024 aluminum matrix.
通过感应铸造制备了含有0.5体积%和1体积%的石墨烯纳米片以及1体积%和2体积%的活性纳米碳的2024铝基纳米碳复合材料。研究了增强相和热处理对复合材料性能的影响。对热处理前复合材料微观结构的分析表明，增强相均匀分散，不存在二次碳化物或氧化物相。碳纳米颗粒的存在对基体的微观结构特征有显著影响。热处理后这种行为进一步增强。通过单轴压缩试验、显微维氏硬度试验和动态力学分析对力学性能和阻尼性能进行了评估。与铸态2024铝相比，屈服强度和极限强度分别提高了28%（1体积%的石墨烯纳米片）和45%（0.5体积%的石墨烯纳米片）。同样，与热处理后的2024铝相比，复合材料的屈服强度和极限强度分别提高了56%（0.5体积%的石墨烯纳米片）和57%（0.5体积%的石墨烯纳米片）。同样，样品的硬度比铸态2024铝高33%（1体积%的石墨烯纳米片），相对于热处理后的2024铝高31%（2体积%的活性纳米碳）。在可变温度和应变幅值下测定了纳米碳 - 铝复合材料的阻尼性能。结果表明，未经热处理的复合材料的阻尼性能有所改善。因此，证明了使用小体积分数的纳米碳同素异形体可提高2024铝基体在热处理和未热处理两种情况下的力学性能，且在失效前塑性变形损失有限。
