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首页> 外文期刊>Materials Science and Engineering >High damage-tolerance bio-inspired B_4C/2024Al composites with adjustable mechanical performance by tuning ceramic thickness
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High damage-tolerance bio-inspired B_4C/2024Al composites with adjustable mechanical performance by tuning ceramic thickness

机译：高损坏公差BOI-Inspired B_4C / 2024AL复合材料通过调节陶瓷厚度可调节机械性能

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摘要

Freeze casting is a promising approach for assembling lamellar metal-ceramic composites with an exceptional combination of strength and toughness. Although these mechanical properties can be optimized by regulating the microstructure of porous ceramic structures, the effect of lamellar thickness is rarely mentioned, especially for B_4C/Al composites. Herein, by controlling the freezing temperature, we used freeze casting to create nacre-like B_4C scaffolds with identical ceramic content yet different lamellar thicknesses and then infiltrated them with 2024Al alloy. The effects of lamellar thickness on the damage-tolerance behavior and toughening mechanisms are discussed. The refinement of lamellae decreases the probability of observing catastrophic flaws in ceramic layers, increasing strength from 534 ± 14 to 578 ±15 MPa and increasing crack-initiation toughness (K_(IC)) from 9.2 ± 0.6 to 11.4 ± 0.2 MPa m~(1/2). These composites exhibit higher damage tolerance resulting from several toughening mechanisms, such as plastic deformation, crack deflection and blunting, and the uncracked-ligament bridging of ductile metal layers, which is reflected in the stable crack propagation during fracture and rising R-curve behavior. Importantly, coarsening of the structure of composites allows the fracture behaviors transform from single to multiple crack propagation, thus absorbing much more fracture energy, with the valid crack-growth toughness (K_(JC)) enhancing markedly from 17.1 ± 2.4 to 29.8 ± 2.3 MPa m~(1/2).
机译：冷冻铸件是一种具有优异的强度和韧性组合的层状金属陶瓷复合材料的有希望的方法。尽管可以通过调节多孔陶瓷结构的微观结构来优化这些机械性能，但很少提及层状厚度的效果，特别是对于B_4C / Al复合材料。这里，通过控制冷冻温度，我们使用冷冻铸件以产生具有相同陶瓷含量但不同的层状厚度的丁香样B_4C支架，然后用2024al合金渗透它们。讨论了层状厚度对抗损伤性行为和增韧机制的影响。薄片的细化降低了观察陶瓷层中灾难性缺陷的概率，从9.2±0.6至11.4±0.2MPa m〜（ 1/2）。这些复合材料具有由多种增韧机构产生的更高损伤耐受性，例如塑性变形，裂缝偏转和钝化，以及延性金属层的未粘贴韧带桥接，其在裂缝和上升R曲线行为期间反映在稳定的裂纹繁殖中。重要的是，复合材料结构的粗化允许断裂行为从单一转变为多重裂纹繁殖，从而吸收更多的裂缝能量，有效的裂缝 - 生长韧性（K_（JC））从17.1±2.4至29.8±2.3增加，显着增强mpa m〜（1/2）。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141469.1-141469.10|共10页
  • 作者

    Yang Wang; Qiang Liu; Biao Zhang; Haoqian Zhang; Yicheng Jin; Zhaoxin Zhong; Jian Ye; Yuhan Ren; Feng Ye; Wen Wang;

  • 作者单位

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

    Institute for Advanced Ceramics Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China;

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  • 正文语种 eng
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  • 关键词

    Freeze casting; Pressure infiltration; B_4C/Al composites; Mechanical properties; Toughening mechanism;

    机译：冷冻铸造;压力渗透;B_4C / AL复合材料;机械性能;增韧机制;

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