Abstract
In this work, the mechanically alloyed Fe70Zr30 (at. %) composition has been used to study the influence of milling time on its homogeneity and magnetic properties. The microstructure and Fe environment results show the formation of an almost fully amorphous alloy after 50 h of milling in a mixture of pure 70 at. % Fe and 30 at. % Zr. The soft magnetic behavior of the samples enhances with the increase of the milling time, which is ascribed to the averaging out of the magnetocrystalline anisotropy as the crystal size decreases and the amorphous fraction increases. The formation of a non-perfectly homogenous system leads to a certain compositional heterogeneity, motivating the existence of a distribution of Curie temperatures. The parameters of the distribution (the average Curie temperature, , and the broadening of the distribution, ) have been obtained using a recently reported procedure, based on the analysis of the approach towards the saturation curves and the magnetocaloric effect. The decrease of and the increase of with the milling time are in agreement with the microstructural results. As the remaining α-Fe phase decreases, the amorphous matrix is enriched in Fe atoms, enhancing its magnetic response.
Highlights
The physical behavior of amorphous materials can differ from their crystalline counterparts, because of the nonexistence of long-range order translation symmetry
The X-ray diffraction patterns of the samples after some selected milling times are shown in peaks attributed to the hcp-Zr phase were not detected for these milling times, showing that this
This fact is peaks attributed to the hcp-Zr phase were not detected for these milling times, showing that this phase evidenced by the appearance of a wide amorphous halo near 2θ = 42°, and reflects the absence of a became imperceptible as the Zr atoms dissolved in the Fe amorphous matrix
Summary
The physical behavior of amorphous materials can differ from their crystalline counterparts, because of the nonexistence of long-range order translation symmetry. They present a short-range order (
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