Magnetic and Mossbauer Studies of Nanocomposites with Carbidosteels Composition doped by Chromium and Nickel
Chulkina A.A. 1, Ulyanov A.I. 1, Ulyanov A.L. 1, Porsev V.E. 1
1Udmurt Federal Research Center, Ural Branch Russian Academy of Sciences, Izhevsk, Russia

The properties of alloys (Fe0.95-yCr0.05Niy)83C17 and (Fe0.90-yCr0.10Niy)83C17, where y=0.05 and 0.10, obtained by mechanosynthesis and subsequent annealing, were studied by Mossbauer spectroscopy and magnetic measurements, using X-ray diffraction data. As a result of annealing at 500oC, nanocomposites are formed with a similar phase composition (cementite and austenite matrix with the ferrite inclusions) and maximum values of the coercive force Hc. At the same time, Hc of high-chromium composites is more than two times higher than Hc of low-chromium composites (210-250 and 100 A/cm, respectively). Mossbauer studies have shown that the cementite of high-chromium alloys is in a paramagnetic state, while that of low-chromium alloys is in a ferromagnetic state. This aspect determines the features of magnetization reversal of close to the critical single-domain size ferrite inclusions, which leads to different maximum values of Hc for low- and high-chromium nanocomposites. Keywords: transition metals, mechanosynthesis, nanostructured materials, phase transitions, saturation magnetization, coercive force, Mossbauer spectroscopy.
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