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Interdiffusion in Ni-Rich, Ni-Cr-Al alloys at 1100 and 1200 °C: Part I. Diffusion paths and microstructures

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Abstract

Interdiffusion in Ni-rich, Ni-Cr-Al diffusion couples was studied after annealing at 1100 and 1200 °C. Recession of γ′ (Ni3Al structure), β (NiAl structure), or α (bcc) phases was also measured. Aluminum and chromium concentration profiles were measured in the γ (fcc) phase for most of the diffusion couples. The amount and location of Kirkendall porosity suggests that Al diffuses more rapidly than Cr which diffuses more rapidly than Ni in the γ phase of Ni-Cr-Al alloys. The location of maxima and minima in the concentration profiles of several of the diffusion couples indicates that both cross-term diffusion coefficients for Cr and Al are positive and that DCrAl has a greater effect on the diffusion of Cr than does DA1Cr on the diffusion of Al. The γ/γ + β phase boundary has also been determined for 1200 °C through the use of numerous γ/γ+ β diffusion couples.

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Authors and Affiliations

  1. NASA Lewis Research Center, 44135, Cleveland, OH

    J. A. Nesbitt (Materials Engineer)

  2. Department of Metallurgical Engineering, Michigan Technological University, 49931, Houghton, MI

    R. W. Heckel (Professor)

Authors
  1. J. A. Nesbitt
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  2. R. W. Heckel
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Nesbitt, J.A., Heckel, R.W. Interdiffusion in Ni-Rich, Ni-Cr-Al alloys at 1100 and 1200 °C: Part I. Diffusion paths and microstructures. Metall Trans A 18, 2061–2073 (1987). https://doi.org/10.1007/BF02647078

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