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首页> 美国卫生研究院文献>Nanoscale Research Letters >Microstructure and Mechanical Properties of Graphene Oxide-Reinforced Titanium Matrix Composites Synthesized by Hot-Pressed Sintering
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Microstructure and Mechanical Properties of Graphene Oxide-Reinforced Titanium Matrix Composites Synthesized by Hot-Pressed Sintering

机译：热压烧结合成氧化石墨烯增强钛基复合材料的组织和力学性能

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摘要

Ti matrix composites reinforced with 1–5 wt% graphene oxide (GO) were prepared by hot-pressed sintering in argon atmosphere. The effect of sintering temperature on the microstructures and mechanical properties of the composite was also evaluated. The results show that TiC nanoparticles were formed in situ as interfacial products via the reaction between Ti and GO during sintering. With increases in GO content and sintering temperature, the amount of TiC increased, improving the mechanical properties of the composites. GO was also partly retained with a lamellar structure after sintering. The composite reinforced with 5 wt% GO exhibited a hardness of 457 HV, 48.4% higher than that of pure Ti at 1473 K. The Ti-2.5 wt% GO composite sintered at 1473 K achieved a maximum yield stress of 1294 MPa, which was 62.7 % higher than that of pure Ti. Further increasing the GO content to 5 wt% led to a slight decrease in yield stress owing to GO agglomeration. The fracture morphology of the composite reinforced with GO exhibited a quasi-cleavage fracture, whereas that of the pure Ti matrix showed a ductile fracture. The main strengthening mechanism included grain refinement, solution strengthening, and dispersion strengthening of TiC and GO.
机译：通过在氩气气氛中进行热压烧结制备了含1-5wt％氧化石墨（GO）增强的Ti基复合材料。还评估了烧结温度对复合材料的微观结构和力学性能的影响。结果表明，TiC纳米颗粒在烧结过程中通过Ti和GO之间的反应原位形成界面产物。随着GO含量和烧结温度的增加，TiC的量增加，从而改善了复合材料的机械性能。烧结后，GO也部分保留了层状结构。 5 wt％GO增强的复合材料的硬度为457 HV，比1473 K时的纯Ti高48.4％；在1473 K烧结的Ti-2.5 wt％GO复合材料的最大屈服应力为1294 MPa。比纯钛高62.7％。将GO含量进一步提高至5wt％会导致由于GO附聚而导致屈服应力略有下降。用GO增强的复合材料的断裂形态表现为准裂解断裂，而纯Ti基体的断裂形态表现为韧性断裂。主要的强化机制包括TiC和GO的晶粒细化，固溶强化和弥散强化。

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