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Interdiffusion and intrinsic diffusion in the Ni AI (δ) phase of the Al-Ni system

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Abstract

Interdiffusion coefficients at 950 to 1150°C and the ratio of intrinsic diffusion coefficients at 1100°C were measured as functions of composition in the NiAl (δ) phase of the Al-Ni system, using a vapor-solid technique. Diffusivity values were also obtained for the Ni3Al (∈)and Ni (Al) solid solution (ζ) phases from 950 to 1150°C. The interdiffusion coefficient in NiAl (δ) varies several orders of magnitude over the δ phase field with a deep minimum in the diffusivity-composition curve at 48 to 49 at. pct Al. The ratio of intrinsic diffusion coefficients, Dni/DaI, in the δ phase also varies with composition from a value of 3 to 3.5 below 50 at. pct Al to 0.1 or less above 50 at. pct Al.

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Authors and Affiliations

  1. Howmet Turbine Components Corporation, 49461, Whitehall, MI

    S. Shankar

  2. Department of Materials Science, State Uni- versity of New York, 11794, Stony Brook, NY

    L. L. Seigle (Professor)

Authors
  1. S. Shankar
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  2. L. L. Seigle
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Formerly Research Assistant, Department of Mate-rials Science, SUNY at Stony Brook, New York.

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Shankar, S., Seigle, L.L. Interdiffusion and intrinsic diffusion in the Ni AI (δ) phase of the Al-Ni system. Metall Trans A 9, 1467–1476 (1978). https://doi.org/10.1007/BF02661819

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  • DOI: https://doi.org/10.1007/BF02661819

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