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首页> 外文期刊>Materials Science and Engineering >An approach for fabricating Ni@graphene reinforced nickel matrix composites with enhanced mechanical properties
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An approach for fabricating Ni@graphene reinforced nickel matrix composites with enhanced mechanical properties

机译：具有增强的机械性能的Ni @石墨烯增强的镍基复合材料的制备方法

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摘要

A novel approach is developed for the fabrication of nickel (Ni) matrix composites reinforced by graphene, which involves the synthesis of three-dimensional graphene networks (3D GNs) tightly anchored with Ni nanoparticles (3D Ni@GNs) by an in-situ high-temperature chemical vapor deposition process, subsequent uniform coating of Ni powders around the 3D Ni@GNs by an impregnation-reduction process, and final consolidation of the Ni@GNs/Ni composite powders by spark plasma sintering. Owing to the significant grain refinement and homogeneous dispersion of Ni@GNs in the composites identified through the electron backscattered diffraction, scanning and transmission electron microscopy, the composites exhibited much enhanced mechanical properties; the Ni@GNs/Ni composite with 1.0vol% GNs was demonstrated a yield strength of 474MPa and a tensile strength of 546MPa, ~ 188.4% and ~ 26.0% higher than those of the pure bulk Ni respectively. It was thought that the composites were strengthened by both load transfer from the Ni matrix to the GNs and dispersion strengthening of GNs. Meanwhile, the addition of GNs greatly decreased the grain size of the Ni matrix, leading to a significant grain refinement strengthening for the Ni@GNs/Ni composites.
机译：开发了一种新方法来制造由石墨烯增强的镍（Ni）基复合材料，该方法涉及通过原位高温将Ni纳米颗粒（3D Ni @ GNs）牢固锚固的三维石墨烯网络（3D GNs）。化学气相沉积工艺，随后通过浸渍还原工艺在3D Ni @ GNs周围均匀涂覆镍粉，并通过火花等离子体烧结对Ni @ GNs / Ni复合粉进行最终固结。通过电子背散射衍射，扫描和透射电镜观察，由于Ni @ GNs在复合物中具有明显的晶粒细化和均匀分散性，因此其机械性能大大提高。具有1.0vol％GNs的Ni @ GNs / Ni复合材料的屈服强度为474MPa，抗拉强度为546MPa，分别比纯块状Ni高188.4％和26.0％。可以认为，从Ni基体到GNs的载荷转移和GNs的分散增强都可以增强复合材料。同时，添加GNs大大降低了Ni基体的晶粒尺寸，从而显着增强了Ni @ GNs / Ni复合材料的晶粒细化。

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  • 来源
    《Materials Science and Engineering》 |2018年第7期|108-116|共9页
  • 作者

    Kai Fu; Xiang Zhang; Chunsheng Shi; Enzuo Liu; Fang He; Jiajun Li; Naiqin Zhao; Chunnian He;

  • 作者单位

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University;

    School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ni matrix composites; Graphene; Spark plasma sintering; Microstructure; Mechanical properties;

    机译：镍基复合材料石墨烯火花等离子体烧结显微组织力学性能;

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