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Topography of semicoherent 7/y-interfaces in superalloys: Investigation of the formation mechanism

机译：高温合金半相干7 / y界面的形貌：形成机理的研究

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摘要

A new method for the investigation of interracial dislocations in nickel-base superalloys employing SEM has been recently established by the authors. The dislocations become visible because of grooves, which form in the 7/y-interface at the dislocation core. The groove formation mechanism was investigated by annealing/cooling experiments and creep experiments with the single-crystal superalloys SRR99 and CMSX-4. Possible forces for groove formation are discussed and their magnitude is estimated. The osmotic force, resulting from the vacancy supersaturation during quenching, was found to be the main reason for groove formation. The correlation between groove shape and Burgers vector of the interfacial dislocation is explained. The conditions required for observation of such grooves using SEM are discussed.
机译：作者最近建立了一种使用SEM研究镍基高温合金中的晶间位错的新方法。由于在位错核心的7 / y界面中形成了沟槽，因此位错变得可见。通过退火/冷却实验和蠕变实验研究了单晶高温合金SRR99和CMSX-4的沟槽形成机理。讨论了可能形成凹槽的力，并估计了其大小。发现由淬火过程中空位过饱和引起的渗透力是形成槽的主要原因。解释了槽形与界面错位的Burgers矢量之间的相关性。讨论了使用SEM观察这种凹槽所需的条件。

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  • 来源
    《Materials Science and Engineering》 |2011年第20期|p.6225-6234|共10页
  • 作者

    Thomas Link; Alexander Epishin; Melanie Paulisch; Thomas May;

  • 作者单位

    Technical University Berlin, Institute of Material Science and Technology, Metallic Materials, Seer. BH18, Emst-Reuter-Platz J, D-10587 Berlin. Germany;

    Technical University Berlin, Institute of Material Science and Technology, Metallic Materials, Seer. BH18, Emst-Reuter-Platz J, D-10587 Berlin. Germany;

    Technical University Berlin, Institute of Material Science and Technology, Metallic Materials, Seer. BH18, Emst-Reuter-Platz J, D-10587 Berlin. Germany;

    Technical University Berlin, Institute of Material Science and Technology, Metallic Materials, Seer. BH18, Emst-Reuter-Platz J, D-10587 Berlin. Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    electron microscopy; nickel based superalloys; dislocations; interfaces; phase transformation;

    机译：电子显微镜;镍基高温合金;位错;界面;相变;

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