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Coherency strengthening in Ni base alloys hardened by DO22 γ′ precipitates

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Abstract

The strengthening phase in nickel-base Alloy 718 is a metastable DO22 precipitate termed γ′ which is based upon Ni3Nb. Since the coherent γ′ particles produce a tetragonal distortion of the matrix, the specific variants of γ′ present can be controlled by the application of stress during aging. The resultant variation in strength is appreciable. A detailed comparison with likely strengthening mechanisms indicates that hardening is primarily due to the coherency strains arising from the γ′ precipitate. Implications with regard to design of alloys strengthened by the DO22 phase are considered.

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Authors and Affiliations

  1. Pratt & Whitney Aircraft, 06457, Middletown, Conn.

    J. M. Oblak (Senior Research Associate), D. F. Paulonis (Senior Materials Engineer) & D. S. Duvall (Assistant Materials Project Engineer)

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  1. J. M. Oblak
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  2. D. F. Paulonis
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  3. D. S. Duvall
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Oblak, J.M., Paulonis, D.F. & Duvall, D.S. Coherency strengthening in Ni base alloys hardened by DO22 γ′ precipitates. Metall Trans 5, 143–153 (1974). https://doi.org/10.1007/BF02642938

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