Abstract:
The phase composition, magnetic state of the phases and their influence on the formation of the magnetic hysteresis properties of the nanocomposite with the (Fe$_{0.85}$Mn$_{0.10}$Ni$_{0.05}$)$_{83}$C$_{17}$ composition after mechanosynthesis and subsequent annealing have been studied. It is shown that, although the dependences of the coercive force on the annealing temperature $H_c(T_{\text{ann}})$ of the alloy, measured at room and liquid nitrogen temperatures, are curves with maxima, the formation of $H_c$ is driven by different mechanisms. At room temperature measurements, the maximum $H_c$ value of the composite is obtained when the size of the ferrite phase precipitates approaches to the critical single-domain state, whereas at low temperature maximum $H_c$ value is caused by the change of the cementite structural state upon annealing.
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