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The influence of coherency strain on the elevated temperature tensile behavior of Ni-15Cr-AI-Ti-Mo alloys

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Abstract

The effect of coherency strain on elevated temperature tensile strength was examined in a model, two-phase y’-strengthened Ni-15Cr-Al-Ti-Mo alloy series. The temperature dependence of coherency strain as represented by the γ-γ’ mismatch was determined over the temperature range 25 to 800 °C. The flow stress incrementAσ γ, due to precipitation of γ’, was found to correlate well to the magnitude of the γ-γ’ mismatch over the same temperature interval. The correlation was strongest for high misfit alloys regardless of the Antiphase Boundary Energy (APBE). The predominance of by-pass type dislocation-particle interactions in high coherency alloys confirms that strengthening is primarily due to coherency strains. Conversely, alloys with low misfit exhibit two distinct particle shear mechanisms believed to be dependent upon the relative APBE and matrix stacking fault energy of the alloy.

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Authors and Affiliations

  1. Thin Films Dept., IBM Corporation, East Fishkill Facility, Route 52, 12533, Hopewell Junction, NY

    D. A. Grose (Manager)

  2. Rensselaer Polytechnic Institute, 12180, Troy, NY

    G. S. Ansell (Dean of Engineering)

Authors
  1. D. A. Grose
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  2. G. S. Ansell
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Grose, D.A., Ansell, G.S. The influence of coherency strain on the elevated temperature tensile behavior of Ni-15Cr-AI-Ti-Mo alloys. Metall Trans A 12, 1631–1645 (1981). https://doi.org/10.1007/BF02643569

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  • DOI: https://doi.org/10.1007/BF02643569

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