Physics of the Solid State
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Phase composition and magnetic properties of boron-doped Fe75C25-based alloys: mechanosynthesis, annealing
Chulkina A.A. 1, Ulyanov A.I. 1, Ulyanov A.L. 1, Zagainov A.V. 1
1Udmurt Federal Research Center, Ural Branch Russian Academy of Sciences, Izhevsk, Russia
Email: chulkina@udman.ru, uai@udman.ru, ulyanov@udman.ru, zagainov@udman.ru

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A structural and phase analysis of boron-doped cementite Fe75(C1-xBx)25 alloys with x=0.05,0.1,0.2 and 0.4 was performed using X-ray diffraction, magnetic measurements, and Mossauer spectroscopy, both after mechanical synthesis and after subsequent annealing. The features of carbide phases alloying in these alloys were investigated. During the mechanical synthesis process, cementite is minimally alloyed with boron. When annealed above 400 oC, the boron concentration in this phase increases significantly. The Curie temperature of cementite in Fe75(C1-xBx)25 alloys annealed at 800 oC increases with increasing boron content, ranging from 210 to 360 oC. In alloys with increased boron content Fe75(C0.8B0.2)25 and Fe75(C0.6B0.4)25, when annealed at temperatures above 600-650 oC, part of the borocementite is transformed into the boron-doped phase Fe23(C,B)6, the Curie temperature of which after annealing at 800 oC is 450 and 480 oC, respectively. Keywords: mechanosynthesis, annealing, phase composition, carbides, boron alloying.
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