Role of magnetism in the formation of a short-range order in iron-silicon alloys

Journal Article · Sun May 15 04:00:00 EDT 2011 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776111040066· OSTI ID:22028073

Gorbatov, O I; Kuznetsov, A R; Gornostyrev, Yu N ^[1]; Ruban, A V ^[2]; Ershov, N V; Chernenkov, Yu P; Fedorov, V I ^[3]

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1. Institute of Quantum Materials Science (Russian Federation)
2. Royal Institute of Technology (KTH) (Sweden)
3. Russian Academy of Sciences, Petersburg Nuclear Physics Institute (Russian Federation)

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{sub C} (where T{sub C} is the Curie temperature) with the content c{sub Si} close to the boundary of the two-phase region. Annealing at temperatures T < T{sub C} for the content c{sub Si} {>=} 0.08 leads to an increase in the fraction of regions with the D0{sub 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{sub C} and is fixed at quenching, whereas the D0{sub 3}-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.

• OSTI ID: 22028073
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 5 Vol. 112; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
BCC LATTICES
COMPUTERIZED SIMULATION
CURIE POINT
EQUILIBRIUM
FERROMAGNETISM
INTERACTION RANGE
INTERATOMIC FORCES
IRON
IRON ALLOYS
MONTE CARLO METHOD
SILICON ALLOYS
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE