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Stability of the directionally solidified eutectics NiAl-Cr and NiAl-Mo

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Abstract

The eutectics NiAl-Cr with cylindrical chromium fibers and NiAl-Mo with faceted molybdenum fibers were heated at 1400°C to determine the stability of the composite structure and to compare the stability of the nonfaceted fibers with that of the faceted fibers in the NiAl matrix. Fiber size and size distribution and number of fibers per unit area were measured as a function of time at temperature. The number of fibers in the NiAl-Cr eutectic decreased continuously reaching half the initial value in about 30 h at temperature. Spheroidization of the fibers occurred and was complete in 160 h. In the NiAl-Mo eutectic, the number of fibers per unit area remained constant to 150 h and the fiber size was constant to 331 h at 1400°C. In NiAl-Cr, the cylindrical chromium fibers first formed pinchedoff segments at random diameter variations along the length of the fibers. The segments gradually shortened and thickened and finally spheroidized. The faceted molybdenum fibers remained stable because the Mo-NiAl interface is constrained to lie in the facet plane which inhibits the formation of faults leading to pinching off of the fibers.

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Authors and Affiliations

  1. General Electric Corporate Research and Development, 12301, Schenectady, N. Y.

    J. L. Walter & H. E. Cline

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  1. J. L. Walter
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  2. H. E. Cline
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Walter, J.L., Cline, H.E. Stability of the directionally solidified eutectics NiAl-Cr and NiAl-Mo. Metall Trans 4, 33–38 (1973). https://doi.org/10.1007/BF02649602

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  • DOI: https://doi.org/10.1007/BF02649602

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