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Experimental investigation into the crack propagation in multiphase tantalum carbide ceramics

机译:多相碳化钽陶瓷裂纹扩展的实验研究

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摘要

Tantalum carbide ceramics with high volume fractions of the ζ-Ta_4C_3 phase have been shown to exhibit high fracture strength and toughness as compared to those in absence of this phase. In this work, we investigated how microcracks propagated in this these high toughness ceramics using Knoop and Vickers microindentation. The Knoop indentations demonstrated that cracking preferentially occurred parallel to the lath structure in ζ-Ta_4C_3; however shorter cracks did form between the laths when a sufficient driving force was present. The resulting crack path was tortuous providing direct evidence for toughening through crack deflection; however, the microscale nature of the work cannot rule out crack bridging as a toughening mechanism as well. Plasticity is also observed under the indents, but is likely a result of the high confining pressures that occurred during indentation allowing for plastic flow.
机译:与不存在该相的碳化钽陶瓷相比,已显示出具有高体积分数的ζ-Ta_4C_3相的碳化钽陶瓷具有较高的断裂强度和韧性。在这项工作中,我们使用努氏和维氏显微压痕技术研究了微裂纹如何在这些高韧性陶瓷中传播。努氏压痕表明,裂纹优先平行于ζ-Ta_4C_3中的板条结构发生。但是,当有足够的驱动力时,在板条之间确实会形成较短的裂纹。产生的裂纹路径是曲折的,为通过裂纹变形而增韧提供了直接的证据。但是,工作的微观性质也不能排除裂纹桥接作为增韧机制。在压痕下也观察到可塑性,但可能是压痕期间出现的高围压导致塑料流动的结果。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|315-321|共7页
  • 作者单位

    Department of Metallurgical & Materials Engineering, The University of Alabama, 301 7th Avenue, 116 Houser Hall, Tuscaloosa, AL 35487-0202, United States;

    UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1894, United States;

    UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1894, United States;

    Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523, United States;

    UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1894, United States;

    Air Force Research Laboratory Materials & Manufacturing Directorate, Structural Material Division (AFRL/RXLN), 2230 Tenth St, Wright-Patterson AFB, OH 4543307817, United States;

    Department of Metallurgical & Materials Engineering, The University of Alabama, 301 7th Avenue, 116 Houser Hall, Tuscaloosa, AL 35487-0202, United States;

    Department of Metallurgical & Materials Engineering, The University of Alabama, 301 7th Avenue, 116 Houser Hall, Tuscaloosa, AL 35487-0202, United States;

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

    Tantalum carbides; Microscopy;

    机译:碳化钽;显微镜检查;

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