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Multi-layer graphene reinforced nano-laminated WC-Co composites

机译：多层石墨烯增强纳米层压WC-Co复合材料

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摘要

The current study applies towards investigate the sintering behavior, mechanical properties as well as stability of predesigned Co gradient of nano-laminated multi-layer graphene (MLG) reinforced WC-Co composites, highlighting the critical roles of MLG as exceptional toughening phase and superior cobalt gradient stability enhancement phase. During liquid phase sintering, the stability of predesigned cobalt gradient can be significantly enhanced via controlling MLG content. The three crucial cobalt gradient stability enhancing mechanisms are MLG preferential orientation, MLG inducing the generation of the liquid cobalt phase and MLG wrapping matrix grains. MLG intrinsic toughening mechanism i.e. MLG bending together with extrinsic toughening mechanisms such as MLG wrapping, interface debonding, MLG wall and network, MLG induced weak interface, MLG pullout, crack deflection, crack bridging and crack stopping is the major toughening mechanisms. Besides, stabilization of the predesigned Co-gradient and grain reinforcement are also the important contribution to the improved hardness to toughness relationship.
机译：本研究适用于研究纳米层压多层石墨烯（MLG）增强的WC-Co复合材料的烧结行为，力学性能以及预先设计的Co梯度的稳定性，强调了MLG作为优异的增韧相和优质钴的关键作用。梯度稳定性增强阶段。在液相烧结过程中，可以通过控制MLG含量显着提高预先设计的钴梯度的稳定性。三个关键的钴梯度稳定性增强机制是MLG优先取向，MLG诱导液相钴相的产生和MLG包裹基体晶粒。 MLG固有的增韧机制，即MLG弯曲以及外部增韧机制（例如MLG包裹，界面剥离，MLG壁和网络），MLG引起的弱界面，MLG拔出，裂纹偏转，裂纹桥接和裂纹阻止是主要的增韧机制。此外，预先设计的共梯度和晶粒增强的稳定性也是改善硬度与韧性关系的重要贡献。

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  • 来源
    《Materials Science and Engineering》 |2018年第18期|1-7|共7页
  • 作者

    Jialin Sun; Jun Zhao;

  • 作者单位

    Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University,National Demonstration Center for Experimental Mechanical Engineering Education (Shandong University);

    Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University,National Demonstration Center for Experimental Mechanical Engineering Education (Shandong University);

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

    Functionally graded materials; Multi-layer graphene; Nanocomposites; Cobalt gradient stability; Toughening mechanisms;

    机译：功能梯度材料;多层石墨烯;纳米复合材料;钴梯度稳定性;增韧机理;

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