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An observation of vacancy sources during substitutional diffusion in thoriated nickel alloys

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Abstract

Various solid-solid diffusion couples were assembled from thoriated and nonthoriated alloys, welded, and diffusion annealed at 1530 K. Concentration profiles of the diffused couples indicated that a thoria dispersion does not affect diffusion in Cr(alloy): Ni and Ni-4.8A1: Ni types of couples unless a fine grain structure is retained by the thoria particles. Metallography revealed the presence of ThO2-free bands in the thoriated nickel side of the diffusion zone. The bands formed at grain boundaries perpendicular to the direction of diffusion and, in some cases, contained non-Kirkendall porosity. A mechanism based on the operation of vacancy sources is proposed to explain the ThO2-free bands.

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Authors and Affiliations

  1. NASA-Lewis Research Center, 44135, Cleveland, Ohio

    John D. Whittenberger (Research Metallurgist)

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  1. John D. Whittenberger
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Whittenberger, J.D. An observation of vacancy sources during substitutional diffusion in thoriated nickel alloys. Metall Trans 4, 715–725 (1973). https://doi.org/10.1007/BF02643080

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  • DOI: https://doi.org/10.1007/BF02643080

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