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Fracture toughness of nanocrystalline metal matrix composites reinforced by aligned carbon nanotubes

机译：定向碳纳米管增强纳米晶金属基复合材料的断裂韧性

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摘要

Experimental observations have shown that carbon nanotubes (CNTs)/Al nanocomposites with high level ordered nanolaminates exhibit greatly improved plasticity. The increased plasticity is mainly attributed to enhanced dislocation storage capability and two-dimensional alignment of the reinforcement. Here a theoretical model is proposed with interactions between aligned CNTs and grain boundary dislocations emitted from a crack tip taken into consideration to investigate crack blunting and fracture toughness in nanocrytalline metal matrix composites (MMCs). The critical shear stress for emission of first dislocation from intersections between a long, flat crack and aligned CNTs is quantitatively characterized. The final equilibrium positions and maximum numbers of emitted dislocations for different orientation angles and microstructures of aligned reinforcement are evaluated. In addition, the dependence of enhanced fracture toughness on effective gliding distance of emitted dislocations is also determined. The results show that the existence of aligned CNTs can lead to an increase of critical crack intensity factor by 77% than that in dislocation free case under certain conditions. The model may provide a basis understanding of ductility in aligned CNTs-reinforced nanocrystalline MMCs on respective of emission and motion of dislocations.
机译：实验观察表明，具有高水平有序纳米层合物的碳纳米管（CNT）/ Al纳米复合材料表现出极大的可塑性。可塑性的增加主要归因于增强的位错储存能力和增强材料的二维排列。在此，提出了一种理论模型，其中考虑了对齐的CNT与裂纹尖端散发的晶界位错之间的相互作用，以研究纳米晶金属基复合材料（MMC）的裂纹钝化和断裂韧性。定量表征了从长而平坦的裂纹与排列的CNT之间的交点发出的第一位错的临界剪切应力。评估了不同取向角和对齐钢筋的微观结构的最终平衡位置和发射位错的最大数量。另外，还确定了增强的断裂韧性对所发射位错的有效滑动距离的依赖性。结果表明，在一定条件下，定向碳纳米管的存在比无位错情况下的临界裂纹强度因子提高了77％。该模型可以提供关于位错的发射和运动各自的对准的CNT增强的纳米晶体MMC中的延展性的基础理解。

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  • 来源
    《Journal of Materials Research》 |2015年第21期|3267-3276|共10页
  • 作者

    Shuhong Dong; Jianqiu Zhou; David Hui; Lu Wang;

  • 作者单位

    Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China Department of Mechanical Engineering, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China;

    Department of Mechanical Engineering, Nanjing Tech University, Nanjing, Jiangsu Province 210009, China Department of Mechanical Engineering, Wuhan Institute of Technology, Wuhan, Hubei Province 430070, China;

    Department of Mechanical Engineering, University of New Orleans, New Orleans, Louisiana 70148, USA;

    National Technology Research Center on Pressure Vessel and Pipeline Safety Engineering, Hefei General Machinery Research Institute, Hefei, Anhui Province 230031, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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