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Role of Magnetism in the Formation of a Short-Range Order in Iron-Silicon Alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2011 (English)In: Journal of Experimental and Theoretical Physics, ISSN 1063-7761, E-ISSN 1090-6509, Vol. 112, no 5, p. 848-859Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 112, no 5, p. 848-859
National Category
Physical Sciences
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URN: urn:nbn:se:kth:diva-37172DOI: 10.1134/S1063776111040066ISI: 000292749500014Scopus ID: 2-s2.0-80051640095OAI: oai:DiVA.org:kth-37172DiVA, id: diva2:432302
Available from: 2011-08-02 Created: 2011-08-02 Last updated: 2017-12-08Bibliographically approved

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