Abstract
The formation of a short-range order in soft magnetic Fe-Si alloys depending on the annealing temperature has been investigated theoretically and experimentally. The B2-type short-range order has been observed in samples quenched from temperatures T > T C (where T C is the Curie temperature) with the content c Si close to the boundary of the two-phase region. Annealing at temperatures T < T C for the content c Si ≥ 0.08 leads to an increase in the fraction of regions with the D03-type short-range order. The mechanism of the formation of the short-range order in Fe-Si solid solutions has been analyzed by the Monte Carlo simulation with the ab initio calculated interatomic interaction parameters. It has been shown that the energy of the effective Si-Si interaction in bcc iron strongly depends on the magnetic state of the matrix. As a result, the B2-type short-range order is formed at T > T C and is fixed at quenching, whereas the D03-type shortrange order is equilibrium in the ferromagnetic state. The results reveal the decisive role of magnetism in the formation of the short-range order in Fe-Si alloys and allow the explanation of the observed structural features of the alloys depending on the composition and temperature.
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Original Russian Text © O.I. Gorbatov, A.R. Kuznetsov, Yu.N. Gornostyrev, A.V. Ruban, N.V. Ershov, V.A. Lukshina, Yu.P. Chernenkov, V.I. Fedorov, 2011, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 139, No. 5, pp. 969–982.
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Gorbatov, O.I., Kuznetsov, A.R., Gornostyrev, Y.N. et al. Role of magnetism in the formation of a short-range order in iron-silicon alloys. J. Exp. Theor. Phys. 112, 848–859 (2011). https://doi.org/10.1134/S1063776111040066
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DOI: https://doi.org/10.1134/S1063776111040066