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首页> 外文期刊>Materials Science and Engineering >Strengthening mechanism in graphene nanoplatelets reinforced aluminum composite fabricated through spark plasma sintering
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Strengthening mechanism in graphene nanoplatelets reinforced aluminum composite fabricated through spark plasma sintering

机译：火花等离子体烧结制备石墨烯纳米片增强铝复合材料的强化机理

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摘要

Graphene nanoplatelets (GNP) reinforced aluminum matrix composites, with < 5 wt% GNP content, were synthesized by spark plasma sintering (SPS). GNPs were found to withstand severe conditions of high pressure and temperature during processing. Strength of composite was observed to be depending on the content and uniform dispersion of GNP in aluminum matrix, as verified by scanning electron micrographs. X-ray diffraction analysis confirmed that no reaction products exist at Al-GNP interface in significant amount. Instrumented indentation studies revealed improvement in hardness by 21.4% with 1 wt% GNP. This is due to the presence of stronger reinforcement, which provides high resistance to matrix against deformation. Improvement in yield strength and tensile strength was 84.5% and 54.8%, respectively, with 1 wt% GNP reinforcement. Properties deteriorated at higher concentration due to agglomeration of GNP. Reinforcing effect of GNPs, in terms of strengthening of composite, is found to be dominated by Orowan strengthening mechanism. Pinning of grains boundaries by GNPs led to uniform grain size distribution in the composites structure. Overall, graphene reinforcement has offered 86% improvement in specific strength of aluminum matrix.
机译：通过火花等离子体烧结（SPS）合成了石墨烯纳米片（GNP）增强的铝基复合材料，其中GNP含量<5 wt％。发现GNP在加工过程中可以承受高压和高温的严酷条件。通过扫描电子显微照片证实，观察到复合材料的强度取决于GNP在铝基质中的含量和均匀分散。 X射线衍射分析证实在Al-GNP界面上不存在大量反应产物。仪器压痕研究表明，使用1 wt％的GNP，硬度提高了21.4％。这是由于存在更强的增强作用，从而增强了基体抗变形的能力。用1wt％的GNP增强，屈服强度和抗张强度的改善分别为84.5％和54.8％。由于GNP的团聚，在较高浓度下性能劣化。在增强复合材料方面，发现GNP的增强作用主要由Orowan增强机制决定。 GNP钉扎晶界导致复合材料结构中晶粒尺寸分布均匀。总体而言，石墨烯增强材料使铝基体的比强度提高了86％。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|20-28|共9页
  • 作者

    Ankita Bisht; Mukul Srivastava; R. Manoj Kumar; Indranil Lahiri; Debrupa Lahiri;

  • 作者单位

    Biomaterials and Multiscale Mechanics Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    Biomaterials and Multiscale Mechanics Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India ,Nanomaterials and Applications Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    Biomaterials and Multiscale Mechanics Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    Nanomaterials and Applications Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

    Biomaterials and Multiscale Mechanics Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Graphene nanoplatelets; Aluminum; Spark plasma sintering; Orowan strengthening mechanism;

    机译：石墨烯纳米片;铝;火花等离子体烧结;加强机制;

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