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The temperature dependence of stacking fault energy in Fe-Cr-Ni alloys

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Abstract

The variation of intrinsic stacking fault energy (γi) in two austenitic Fe-Cr-Ni alloys has been determined from dislocation node measurements over the range 25‡ to 325‡C by means of high temperature transmission electron microscopy. In both alloys γi increases with temperature. Both reversible and irreversible effects have been observed in cyclic heating-cooling experiments. After the first heating to elevated temperature the irreversible component is removed and thereafter cyclic annealing produces essentially reversible changes in γi. The large reversible changes are best understood in terms of the variation in the stability of austenite with temperature. The smaller irreversible effect appears to arise from the formation of substitutional solute atmospheres around partial dislocations at elevated temperature.

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Authors and Affiliations

  1. Research Institute for Advanced Studies, Martin-Marietta Corp., Baltimore, Md

    R. M. Latanision (Research Scientist)

  2. Metallurgy Division, National Bureau of Standards, USA

    A. W. Ruff (Chief, Lattice Defects and Microstructures Section)

Authors
  1. R. M. Latanision
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  2. A. W. Ruff
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Formerly NAS-NAE-NBS Post Doctoral Research Associate, National Bureau of Standards, Washington, D. C.

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Latanision, R.M., Ruff, A.W. The temperature dependence of stacking fault energy in Fe-Cr-Ni alloys. Metall Trans 2, 505–509 (1971). https://doi.org/10.1007/BF02663341

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