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Microstructure and mechanical properties of aluminum matrix composites with different volume fractions of surface-oxidized nanodiamonds
Composites and Advanced Materials ( IF 2.4 ) Pub Date : 2020-12-28 , DOI: 10.1177/2633366x20977493
Wei Yan 1 , Mingchen Ma 1 , Heyi Kang 1 , Qian Li 1 , Hongqun Tang 1, 2 , Fenglin Zhang 3 , Junhao Xie 1 , Xingcheng Ou 1
Affiliation  

Nanodiamonds (NDs) have the characteristics of both diamonds and nanomaterials. However, it is difficult to disperse NDs, and this is why there is less research regarding NDs in the field of aluminum matrix composites. In the present work, NDs were modified via surface oxidation, and ND/Al matrix composites were successfully prepared via mechanical ball milling and vacuum sintering. The effects of different volume fraction of NDs (1%, 3%, 5%, 7%) after surface oxidation on the ND/Al matrix composite were analyzed using a metallographic microscope, scanning electron microscope, infrared spectrometer, X-ray diffractometer, microhardness tester, and universal testing machine. The results show that the optimal temperature of surface oxidation treatment is 673 K, which effectively purifies the surface of ND and introduces appropriate C=O functional groups. NDs are uniformly distributed in the aluminum matrix, and no harmful Al4C3 phase is formed. With an increase in the volume fraction of NDs, the grain size of the matrix first decreases and then increases, and the ultimate compressive strength first increases and then decreases. The volume fraction of ND with better comprehensive performance is 3% and the yield strength increased by 19%.



中文翻译:

不同体积分数的表面氧化纳米金刚石铝基复合材料的组织和力学性能

纳米金刚石(NDs)具有钻石和纳米材料的特性。然而,难以分散ND,这就是为什么在铝基复合材料领域中关于ND的研究较少的原因。在目前的工作中,通过表面氧化改性了ND,并且通过机械球磨和真空烧结成功地制备了ND / Al基复合材料。使用金相显微镜,扫描电子显微镜,红外光谱仪,X射线衍射仪分析了表面氧化后ND的不同体积分数(1%,3%,5%,7%)对ND / Al基复合材料的影响,显微硬度计和通用测试机。结果表明,表面氧化处理的最佳温度为673 K,有效地净化ND的表面并引入合适的C = O官能团。NDs均匀分布在铝基体中,无有害铝形成4 C 3相。随着NDs体积分数的增加,基体的晶粒尺寸先减小然后增大,并且最终抗压强度首先增大然后减小。综合性能更好的ND的体积分数为3%,屈服强度提高了19%。

更新日期:2020-12-28
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