Nanocomposite powders of -Fe phases are prepared by mechanical alloying. Starting from high-energy ball milling of elemental powders, mixed to give a nominal composition of , the hard phase is formed by a solid state reaction at relatively low temperatures and coexists with the bcc-Fe phase. For an optimum annealing temperature, this two-phase composite material shows remanence values well above 0.8 T and a very smooth hysteresis loop that is typical for a magnetically single-phase material. This has to be attributed to a strong exchange interaction between the soft and the hard grains. In order to improve the magnetic performance, the influence of several additions on the microstructure has been studied. This enables us to explain the different magnetic properties of Si, Zr or Cu containing samples.
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Crespo et al. (1997) studied this question.
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