Abstract
The evolution of the structurally different phases and of the microstructural state of Fe-xAl alloys is studied in neutron diffraction experiments performed in the high resolution and continuous temperature scanning modes. It is found that the D03 phase in a weakly nonequilibrium state of alloys occurring in the doping range from x ≈ 23 to x ≈ 31 at % has the form of nanoclusters (L ≈ 100–800 Å) dispersed within a host material (matrix) such as the disordered (A2) or partially ordered (B2) phase. The B2 → D03 → B2 → A2 phase transitions are accompanied by a decrease or increase in the lattice parameters of these phases in the course of ordering or disordering of the atomic structure, respectively. In this situation, the lattice parameters of both the matrix and clusters change simultaneously and a high degree of coherence of the crystal lattices of the matrix and clusters is observed.
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Acknowledgments
We are grateful to H. Neuhäuser for the preparation of alloys and to V.G. Simkin and S.V. Sumnikov for their assistance in the neutron diffraction experiments performed at the IBR-2 neutron source (Joint Institute for Nuclear Research, Dubna).
Funding
This work was supported by the Russian Foundation for Basic Research (project nos. 18-02-00325 and 17-52-44024).
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 9, pp. 584–590.
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Balagurov, A.M., Bobrikov, I.A. & Golovin, I.S. Effects of Ordering in Fe-xAl Alloys. Jetp Lett. 110, 585–591 (2019). https://doi.org/10.1134/S0021364019210057
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DOI: https://doi.org/10.1134/S0021364019210057