Short-Range Order in α-FeAl Soft Magnetic Alloy

• Published in: Physics of the solid state 2018-09, Vol.60 (9), p.1661-1673
• Main Authors: Ershov, N. V., Chernenkov, Yu. P., Lukshina, V. A., Smirnov, O. P.
• Format: Article
• Language: English
• Subjects: Alloys; ALUMINIUM COMPOUNDS; Aluminum; Aluminum base alloys; ANNEALING; Atomic structure; BINARY ALLOY SYSTEMS; CESIUM CHLORIDES; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COOLING; CRYSTAL STRUCTURE; Diffraction patterns; DIFFRACTOMETERS; Ferromagnetic phases; FERROMAGNETISM; IRON COMPOUNDS; Magnetic alloys; Metals; MONOCRYSTALS; PARAMAGNETISM; PHASE DIAGRAMS; Physics; Physics and Astronomy; Quenching; Short range order; SILICON ALLOYS; Silicon base alloys; Single crystals; Solid State Physics; Unit cell; X-RAY DIFFRACTION
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S106378341809010X

The atomic structure of iron–aluminum alloy samples containing about 7 at % of aluminum (α region of the phase diagram) was investigated by X-ray diffraction. The samples were annealed in the paramagnetic ( T > T C ) and ferromagnetic ( T < T C ) states. In the first case, the structural state was fixed by quenching from the annealing temperature in water, and, in the second case, by slow cooling. Diffraction patterns of single-crystal samples were taken on an X-ray four-circle diffractometer. It is shown that local ordering, regardless of the prehistory of a sample, is a combination of B 2-phase clusters (the CsCl type structure), which were previously found in iron–silicon alloys with Si content up to 10%, and small regions with D 0 3 short-range order. The former consist of two B 2-cells having a common face, while the latter consist predominantly of one unit cell of the D 0 3 -phase. Within the accuracy of the experiment, no significant difference in the structural states in the paramagnetic and ferromagnetic phases was observed.