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Low-temperature extension of the lehrer diagram and the iron-nitrogen phase diagram

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Abstract

Iron layers are nitrided in mixtures of ammonia and hydrogen at low temperatures, using a thin nickel caplayer as a catalyst. In the coordinate field of inverse temperature vs nitriding potential, we determined the boundaries between areas in which the α, γ′, or ε phases are in thermal equilibrium. Using these data, the Fe-N phase diagram is extended from 350 °C to 240 °C and extrapolated down to 200 °C. The α, γ′, and ε phases probably coexist in a triple point in the Lehrer diagram around 214 °C.

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Authors and Affiliations

  1. the Research Group Nuclear Solid State Physics, Materials Science Center MSC, University of Groningen, NL 9747 AG, Groningen, The Netherlands

    E. H. Du Marchie van Voorthuysen (Assistant Professor), D. O. Boerma (Professor) & N. C. Chechenin (Leading Scientist)

  2. the Institute of Nuclear Physics, Moscow State University, Moscow, Russia

    N. C. Chechenin (Leading Scientist)

Authors
  1. E. H. Du Marchie van Voorthuysen
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  2. D. O. Boerma
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  3. N. C. Chechenin
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van Voorthuysen, E.H.D.M., Boerma, D.O. & Chechenin, N.C. Low-temperature extension of the lehrer diagram and the iron-nitrogen phase diagram. Metall Mater Trans A 33, 2593–2598 (2002). https://doi.org/10.1007/s11661-002-0380-2

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  • DOI: https://doi.org/10.1007/s11661-002-0380-2

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