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Crack propagation in silicon nitride ceramics under various temperatures and grain boundary toughness

机译:氮化硅陶瓷在不同温度和晶界韧性下的裂纹扩展

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摘要

Crack deflection angles and fracture modes were investigated by elaborative observation of 5764 crack deflections, generated at 77 K, 159 K, 293 K and 500 K, in silicon nitride (Si_3N_4) ceramics. In addition, the effects of grain boundary toughness on crack propagation in Si_3N_4 ceramics were statistically analyzed based on a two-dimensional, polycrystalline model. The results demonstrated that temperature (77-500 K) had little influence on crack advance, but the change of grain boundary toughness contributed a lot to the change of crack propagation. The distribution of deflection angles varied distinctly and the fraction of transgranular fracture increased when the grain boundary toughness increased.
机译:通过仔细观察氮化硅(Si_3N_4)陶瓷在77 K,159 K,293 K和500 K处产生的5764裂纹挠度,研究了裂纹挠度角和断裂模式。此外,基于二维多晶模型,统计分析了晶界韧性对Si_3N_4陶瓷中裂纹扩展的影响。结果表明,温度(77-500 K)对裂纹扩展影响不大,但晶界韧性的变化对裂纹扩展的变化影响很大。当晶界韧性增加时,偏转角的分布变化明显,且跨晶断裂的分数增加。

著录项

  • 来源
    《Materials Science and Engineering》 |2015年第24期|58-61|共4页
  • 作者单位

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    Institute of Materials Science, Darmstadt University of Technology, Darmstadt 64287, Germany;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;

    Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;

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

    Crack propagation; Temperature; Grain boundaries; Silicon nitride; Fracture mode;

    机译:裂纹扩展;温度;晶界氮化硅;断裂模式;

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