Thermally Induced Structural Transformations of Fe40Ni40P14B6 Amorphous Alloy
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Thermal stability and thermally induced structural transformations of Fe40Ni40P14B6 amorphous alloy were examined under non-isothermal and isothermal conditions. Formation of metastable α-(Fe,Ni), and stable γ-(Fe,Ni) and (Fe,Ni)3(P,B) crystalline phases as the main crystallization products was observed, while the presence of small amounts of other crystalline phases like Fe23B6 and Fe2NiB was indicated by electron diffraction in HRTEM. Thermomagnetic curve indicated that Fe content in different crystalline phases is very different, resulting in markedly different Curie temperatures after crystallization. Transmission electron microscopy and atomic force microscopy study suggested multiple-layered platelet-shaped morphology, both on the surface and in the bulk of the crystallized alloy sample. The thermal treatment heating rate and maximum temperature affected surface roughness and grain size inhomogeneity.
The authors would like to thank Professor Vladimir Pavlović (Faculty of Agriculture, University of Belgrade) for performing SEM measurement. This research was supported by the Ministry of Education and Science of Serbia, under the Projects 172057, by Grant 106/08/1440 of the Grant Agency of the Czech Republic, and by the Ministry of Education, Youth and Sports of the Czech Republic, Project No. 1M0512.
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