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Micromechanical study on the deformation behavior of directionally solidified NiAl-Cr eutectic composites

机译：定向凝固NiAl-Cr共晶复合材料变形行为的微力学研究

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摘要

The effect of Cr fibers on the deformation of directionally solidified NiAI-Cr eutectics, prepared at three different solidification speeds affecting the fiber diameter and fiber spacing, was studied at varying length scales using different micromechanical testing techniques. In situ tensile tests in a scanning electron microscope of individual Cr fibers showed high strength accompanied by ductile behavior. Comparative microcompression tests on single-phase NiAl pillars and NiAl pillars containing a single fiber showed that the pillars with the single fiber were marginally weaker than the single-phase pillars for similar pillar diameters. Composite pillars with multiple fibers exhibited an increase of 0.2% offset strength values with increasing solidification speed. Transmission electron microscopy of the composite pillars containing a single fiber after deformation revealed significant dislocation activity both in the fiber and the matrix. It is argued that the interface between the fiber and matrix acts as dislocation source promoting plastic deformation of the brittle NiAl matrix.
机译：使用不同的微机械测试技术，研究了铬纤维对定向凝固NiAl-Cr共晶物变形的影响，该定向凝固是在三种不同的凝固速度下影响纤维直径和纤维间距而制备的。在扫描电子显微镜中对单个Cr纤维进行的原位拉伸测试显示出高强度，并具有韧性。在单相NiAl立柱和包含单根纤维的NiAl立柱上进行的比较微压缩试验表明，对于类似的立柱直径，具有单根纤维的立柱比单相立柱稍弱。随着固化速度的提高，具有多根纤维的复合材料支柱表现出0.2％的偏移强度值增加。变形后包含单个纤维的复合材料柱的透射电子显微镜显示，在纤维和基质中都具有明显的位错活性。有人认为，纤维与基体之间的界面是位错源，促进了脆性NiAl基体的塑性变形。

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  • 来源
    《Journal of Materials Research》 |2017年第11期|2127-2134|共8页
  • 作者

    Amritesh Kumar; Charlotte Ensslen; Antje Krueger; Michael Klimenkov; Oliver Kraft; Ruth Schwaiger;

  • 作者单位

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

    Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany;

  • 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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