Role of Magnetism in the Formation of a Short-Range Order in Iron-Silicon Alloys

Gorbatov, O. I. (author)

Kuznetsov, A. R. (author)

Gornostyrev, Yu. N. (author)

Ershov, N. V. (author)

Lukshina, V. A. (author)

Chernenkov, Yu. P. (author)

Fedorov, V. I. (author)

(creator_code:org_t)

2011
2011
English.
In: Journal of Experimental and Theoretical Physics. - 1063-7761 .- 1090-6509. ; 112:5, s. 848-859

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

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 D0(3)-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 D0(3)-type short-range 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.

By the author/editor: Gorbatov, O. I.; Kuznetsov, A. R.; Gornostyrev, Yu. ...; Ruban, Andrei V.; Ershov, N. V.; Lukshina, V. A.; show more...; Chernenkov, Yu. ...; Fedorov, V. I.; show less...

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