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Paluga, M.
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article
Pecularities of nanocrystal formation in rapidly quenched (FeCo)MoCuB amorphous alloys
Abstract
<p>The effect of the substitution of Fe by Co on the enhancement of glass-forming ability limits and subsequent nanocrystallization was studied in a rapidly quenched amorphous system (Fe<sub>x</sub>Co<sub>y</sub>) <sub>79</sub>Mo<sub>8</sub>Cu<sub>1</sub>B<sub>12</sub> for y/x ranging from 0 to 1. The effect of Cu on nanocrystallization was investigated by comparison with Cu-free amorphous Fe<sub>80</sub>Mo<sub>8</sub>B<sub>12</sub>. Systems partially crystallized at the surface layer were prepared for y/x = 0 using different quenching conditions. The effect of heat treatment of master alloys used for ribbon casting was also assessed. The microstructure and surface/bulk crystallization effects were analysed using transmission electron microscopy and electron and X-ray diffraction in relation to the expected enhancement of high-temperature soft magnetic properties, drastically reduced grain sizes (∼5 nm) and Co content. Unusual surface phenomena were observed, indicating the origin of possible nucleation sites for preferential crystallization in samples with low Co content.</p>