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A theoretical model for the elevated temperature deformation of dispersion hardened metals

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Abstract

A theoretical model is presented to describe the elevated temperature (above 1/2Tm @#@) deforma-tion of dispersion hardened metals such as TD-nickel and SAP alloys. The model is based on two proposals: 1) Both dislocation glide and climb are influenced by matrix stresses at small, incoherent, second phase dispersed particles produced by surface tension effects at the particle-matrix interface. 2) Two concurrent processes may contribute to the elevated temperature deformation of polycrystalline dispersion hardened metals, dislocation motion and diffusion controlled grain boundary sliding. The model may explain the origins of high apparent activation enthalpies and large stress sensitivities which have been observed in dispersion hardened metals. It may also provide guidelines for optimization of elevated temperature strength.

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Authors and Affiliations

  1. Aerospace Research Laboratories, Metallurgy and Ceramics Reserach Laboratory, Wright-Patterson Air Force Base, 45433, Dayton, Ohio

    J. J. Petrovic (Research Scientist)

  2. Case Western Reserve University, 44106, Cleveland, Ohio

    L. J. Ebert (Professor of Metallurgy and Materials Science)

Authors
  1. J. J. Petrovic
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  2. L. J. Ebert
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Petrovic, J.J., Ebert, L.J. A theoretical model for the elevated temperature deformation of dispersion hardened metals. Metall Trans 4, 1309–1314 (1973). https://doi.org/10.1007/BF02644526

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  • DOI: https://doi.org/10.1007/BF02644526

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