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Low-stability pre-transitional states, orderdisorder phase transitions, and B2–A1 structure transformations in the Cu – 40 at.% Pd alloys

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Russian Physics Journal Aims and scope

Low-stability states and peculiarities of structural changes in the region of phase transitions are investigated using the Cu–Pd ~40 at.% Pd alloys as an example. To this end, the crystal lattice and long-range atomic order parameters and the Debye-Waller factors were determined in situ directly in the temperature range of the B2–A1 phases and the order – disorder phase transition using X-ray structural analysis. Based on the data obtained, peculiarities of the B2 and A1 phases in the CuPd alloys were analyzed near the structure-phase transitions and the behavior pattern of atomic vibrations in the crystal lattice was discussed. It is shown that in the CuPd alloys with ~40 at.% Pd, low-stability states are observed, which exhibit a number of anomalous phenomena (such as anisotropy of atomic displacements, splitting, heterophase fluctuations, nonlinearity of the lattice parameter and long-range order parameter dependences, etc.), which precede transformation of the alloy.

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Authors and Affiliations

  1. V. D. Kuznetsov Siberian Physical-Technical Institute of the National Research Tomsk State University, Tomsk, Russia

    A. A. Klopotov, A. I. Potekaev & V. V. Kulagina

  2. Tomsk State Architecture and Building University, Tomsk, Russia

    A. A. Klopotov & É. V. Kozlov

Authors
  1. A. A. Klopotov
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  2. A. I. Potekaev
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  3. É. V. Kozlov
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  4. V. V. Kulagina
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Correspondence to A. A. Klopotov.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 59–69, September, 2011.

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Klopotov, A.A., Potekaev, A.I., Kozlov, É.V. et al. Low-stability pre-transitional states, orderdisorder phase transitions, and B2–A1 structure transformations in the Cu – 40 at.% Pd alloys. Russ Phys J 54, 1012–1023 (2012). https://doi.org/10.1007/s11182-012-9704-x

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  • DOI: https://doi.org/10.1007/s11182-012-9704-x

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