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Lattice constants and compositions of the metastable Ni3Nb phase precipitated in a Ni-15Cr-8Fe-6Nb alloy

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Abstract

The lattice constants of γ and metastable γ″ (Ni3Nb) phases and the composition of the γ″ phase in a nickel-based superalloy (a modified JIS NCF 3-type alloy) are investigated using an X-ray diffractometer and an analytical electron microscope with an energy-dispersive X-ray (EDX) system. The lattice constant of the γ phase decreases and those of the γ″ phase increase during the aging time. The γ″ phase is composed of nickel, niobium, chromium, and iron. While the content of nickel in the γ″ phase increases and reaches a constant composition during the aging time, the chromium and iron content decrease and reach a constant value during aging. The niobium content maintains a constant value regardless of the time that the alloy has aged. The relationship between the lattice constants and the composition of the γ″ phase is discussed in detail. In the early stages of aging, there is the possibility that nickel (including chromium and iron) and niobium atoms mutually substitute for one another, resulting in a somewhat lower degree of order than would normally be expected.

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Author notes

  1. Shuuichi Ikeuchi (Graduate Student, Metallurgical Engineer)

    Present address: Department of Metallurgical Engineering, Toyama University, Japan

Authors and Affiliations

  1. the Department of Intelligent Information Engineering, Toyama University, 930-8555, Toyama, Japan

    Kiyoshi Kusabiraki (Lecturer)

  2. the Department of Structure Analysis, Nippon Steel Technoresearch Corporation, 211-0035, Kawasaki, Japan

    Hajime Komatsu (Research Metallurgist)

  3. Hitachi Metals Co. Ltd., 321-4367, Mooka, Japan

    Shuuichi Ikeuchi (Graduate Student, Metallurgical Engineer)

Authors
  1. Kiyoshi Kusabiraki
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  2. Hajime Komatsu
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  3. Shuuichi Ikeuchi
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Kusabiraki, K., Komatsu, H. & Ikeuchi, S. Lattice constants and compositions of the metastable Ni3Nb phase precipitated in a Ni-15Cr-8Fe-6Nb alloy. Metall Mater Trans A 29, 1169–1174 (1998). https://doi.org/10.1007/s11661-998-0243-6

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  • DOI: https://doi.org/10.1007/s11661-998-0243-6

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