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Influence of the Order-Disorder Phase Transition on the Grain Structure of Iron–Palladium Alloy

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Abstract

Transmission diffraction electron microscopy and optical metallography are used to investigate the grain structure and the crystallographic parameters of grain boundaries in Pd3Fe alloy with short- and long-range atomic orders having the superstructure L12. It has been found that ordering annealing of the Pd3Fe alloy with the ordering temperature T K lower than the recrystallization temperature is accompanied by changes in the grain structure. The average distance between the nearest boundaries and the average grain size decrease. The fraction of twinning boundaries for which the inverse density of coinciding lattice sites (Σ) is equal to 3 increases. This results in a decrease of the twinning boundary energy. A comparative analysis of changes in the grain structure of Ni3Fe and Pd3Fe alloys at the A1 → L12 phase transition is performed. The mechanisms of changes of the grain structure during ordering annealing are discussed.

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Authors and Affiliations

  1. Tomsk State University of Architecture and Building, Russia

    O. B. Perevalova, N. A. Koneva & É. V. Kozlov

  2. Institute for Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Russia

    E. V. Konovalova

Authors
  1. O. B. Perevalova
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  2. E. V. Konovalova
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  3. N. A. Koneva
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  4. É. V. Kozlov
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Perevalova, O.B., Konovalova, E.V., Koneva, N.A. et al. Influence of the Order-Disorder Phase Transition on the Grain Structure of Iron–Palladium Alloy. Russian Physics Journal 46, 1098–1108 (2003). https://doi.org/10.1023/B:RUPJ.0000024360.91688.fe

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  • DOI: https://doi.org/10.1023/B:RUPJ.0000024360.91688.fe

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