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Influence of interatomic correlation effects on short-range order in hexagonal close-packed polycrystalline alloys

  • Metals. Superconductors
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Abstract

The first x-ray diffraction procedure suitable for the investigation of short-range order in polycrystalline alloys having a hexagonal close-packed (hcp) lattice is developed on the basis of the theory proposed by M. A. Krivoglaz for diffuse x-ray scattering by hcp single-crystal alloys. This procedure takes into account specific details of the crystal structure of the hcp lattice, in particular, the presence of two atoms in the unit cell and the close radii of the individual coordination spheres. The realistic character of the procedure is demonstrated experimentally in the example of hcp Mg-Dy and Mg-Tb alloys. The new procedure is used to calculate, for the first time, the modulating functions of linear and quadratic size effects in Mg-Dy and Mg-Tb alloys. It is shown that the size-effect modulating functions for coordination spheres with close radii have different characters, and their inclusion in diffuse scattering sets the stage for solving the problem of calculating the short-range order parameters on these spheres.

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Authors and Affiliations

  1. M. V. Lomonosov Moscow State University, 119899, Moscow, Russia

    V. M. Silonov

  2. Vladimir State University, 600026, Vladimir, Russia

    E. V. Evlyukhina, O. V. Kris’ko & A. B. Evlyukhin

Authors
  1. V. M. Silonov
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  2. E. V. Evlyukhina
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  3. O. V. Kris’ko
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  4. A. B. Evlyukhin
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Fiz. Tverd. Tela (St. Petersburg) 41, 2109–2115 (December 1999)

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Silonov, V.M., Evlyukhina, E.V., Kris’ko, O.V. et al. Influence of interatomic correlation effects on short-range order in hexagonal close-packed polycrystalline alloys. Phys. Solid State 41, 1933–1939 (1999). https://doi.org/10.1134/1.1131130

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  • DOI: https://doi.org/10.1134/1.1131130

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